diff --git a/apps/frontend/package.json b/apps/frontend/package.json
index 3e3dca893b..c650cdf352 100644
--- a/apps/frontend/package.json
+++ b/apps/frontend/package.json
@@ -43,6 +43,7 @@
"@modrinth/moderation": "workspace:*",
"@modrinth/ui": "workspace:*",
"@modrinth/utils": "workspace:*",
+ "@modrinth/api-client": "workspace:*",
"@pinia/nuxt": "^0.5.1",
"@types/three": "^0.172.0",
"@vintl/vintl": "^4.4.1",
diff --git a/apps/frontend/src/app.vue b/apps/frontend/src/app.vue
index 08c6e15e8b..5c58f2f238 100644
--- a/apps/frontend/src/app.vue
+++ b/apps/frontend/src/app.vue
@@ -7,30 +7,21 @@
diff --git a/apps/frontend/src/error.vue b/apps/frontend/src/error.vue
index 6cd52510d2..7f345509b1 100644
--- a/apps/frontend/src/error.vue
+++ b/apps/frontend/src/error.vue
@@ -59,9 +59,21 @@ import { IntlFormatted } from '@vintl/vintl/components'
import Logo404 from '~/assets/images/404.svg'
import ModrinthLoadingIndicator from './components/ui/modrinth-loading-indicator.ts'
+import { createModrinthClient, provideModrinthClient } from './providers/api-client.ts'
import { FrontendNotificationManager } from './providers/frontend-notifications.ts'
+const auth = await useAuth()
+const config = useRuntimeConfig()
+
provideNotificationManager(new FrontendNotificationManager())
+
+const client = createModrinthClient(auth.value, {
+ apiBaseUrl: config.public.apiBaseUrl.replace('/v2/', '/'),
+ archonBaseUrl: config.public.pyroBaseUrl.replace('/v2/', '/'),
+ rateLimitKey: config.rateLimitKey,
+})
+provideModrinthClient(client)
+
const { formatMessage } = useVIntl()
const props = defineProps({
diff --git a/apps/frontend/src/pages/[type]/[id]/settings/environment.vue b/apps/frontend/src/pages/[type]/[id]/settings/environment.vue
index ddba72c32c..01054a724a 100644
--- a/apps/frontend/src/pages/[type]/[id]/settings/environment.vue
+++ b/apps/frontend/src/pages/[type]/[id]/settings/environment.vue
@@ -9,14 +9,15 @@ import {
UnsavedChangesPopup,
useSavable,
} from '@modrinth/ui'
-import { injectApi } from '@modrinth/ui/src/providers/api.ts'
import { defineMessages, useVIntl } from '@vintl/vintl'
+import { injectModrinthClient } from '~/providers/api-client.ts'
+
const { formatMessage } = useVIntl()
const { currentMember, projectV2, projectV3, refreshProject } = injectProjectPageContext()
const { handleError } = injectNotificationManager()
-const api = injectApi()
+const client = injectModrinthClient()
const saving = ref(false)
@@ -49,8 +50,8 @@ const { saved, current, reset, save } = useSavable(
({ environment, side_types_migration_review_status }) => {
saving.value = true
side_types_migration_review_status = 'reviewed'
- api.projects
- .editV3(projectV2.value.id, { environment, side_types_migration_review_status })
+ client.labrinth.projects_v3
+ .edit(projectV2.value.id, { environment, side_types_migration_review_status })
.then(() => refreshProject().then(reset))
.catch(handleError)
.finally(() => (saving.value = false))
diff --git a/apps/frontend/src/pages/[type]/[id]/settings/general.vue b/apps/frontend/src/pages/[type]/[id]/settings/general.vue
index 0367d4a870..00abbe4706 100644
--- a/apps/frontend/src/pages/[type]/[id]/settings/general.vue
+++ b/apps/frontend/src/pages/[type]/[id]/settings/general.vue
@@ -7,14 +7,15 @@ import {
UnsavedChangesPopup,
useSavable,
} from '@modrinth/ui'
-import { injectApi } from '@modrinth/ui/src/providers/api.ts'
import { defineMessages, type MessageDescriptor, useVIntl } from '@vintl/vintl'
+import { injectModrinthClient } from '~/providers/api-client.ts'
+
const { formatMessage } = useVIntl()
const { projectV2: project, refreshProject } = injectProjectPageContext()
const { handleError } = injectNotificationManager()
-const api = injectApi()
+const client = injectModrinthClient()
const saving = ref(false)
@@ -34,7 +35,7 @@ const { saved, current, reset, save } = useSavable(
if (data) {
saving.value = true
- api.projects
+ client.labrinth.projects_v2
.edit(project.value.id, { title, description: tagline, slug: url })
.then(() => refreshProject().then(reset))
.catch(handleError)
diff --git a/apps/frontend/src/pages/servers/manage/[id].vue b/apps/frontend/src/pages/servers/manage/[id].vue
index 5e750616c7..a6af4bf864 100644
--- a/apps/frontend/src/pages/servers/manage/[id].vue
+++ b/apps/frontend/src/pages/servers/manage/[id].vue
@@ -1044,7 +1044,7 @@ const nodeUnavailableDetails = computed(() => [
{
label: 'Node',
value:
- server.moduleErrors?.general?.error.responseData?.hostname ??
+ (server.moduleErrors?.general?.error.responseData as any)?.hostname ??
server.general?.datacenter ??
'Unknown',
type: 'inline' as const,
diff --git a/apps/frontend/src/providers/api-client.ts b/apps/frontend/src/providers/api-client.ts
new file mode 100644
index 0000000000..e552111b8f
--- /dev/null
+++ b/apps/frontend/src/providers/api-client.ts
@@ -0,0 +1,42 @@
+import type { AbstractFeature, AuthConfig, NuxtClientConfig } from '@modrinth/api-client'
+import {
+ AuthFeature,
+ CircuitBreakerFeature,
+ NuxtCircuitBreakerStorage,
+ NuxtModrinthClient,
+ VerboseLoggingFeature,
+} from '@modrinth/api-client'
+import { createContext } from '@modrinth/ui'
+
+export function createModrinthClient(
+ auth: { token: string | undefined },
+ config: { apiBaseUrl: string; archonBaseUrl: string; rateLimitKey?: string },
+): NuxtModrinthClient {
+ const optionalFeatures = [
+ import.meta.dev ? (new VerboseLoggingFeature() as AbstractFeature) : undefined,
+ ].filter(Boolean) as AbstractFeature[]
+
+ const clientConfig: NuxtClientConfig = {
+ labrinthBaseUrl: config.apiBaseUrl,
+ archonBaseUrl: config.archonBaseUrl,
+ rateLimitKey: config.rateLimitKey,
+ features: [
+ new AuthFeature({
+ token: async () => auth.token!,
+ } as AuthConfig),
+ new CircuitBreakerFeature({
+ storage: new NuxtCircuitBreakerStorage(),
+ maxFailures: 3,
+ resetTimeout: 30000,
+ }),
+ ...optionalFeatures,
+ ],
+ }
+
+ return new NuxtModrinthClient(clientConfig)
+}
+
+export const [injectModrinthClient, provideModrinthClient] = createContext(
+ 'root',
+ 'modrinthClient',
+)
diff --git a/packages/api-client/LICENSE b/packages/api-client/LICENSE
new file mode 100644
index 0000000000..f288702d2f
--- /dev/null
+++ b/packages/api-client/LICENSE
@@ -0,0 +1,674 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc.
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
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+software and other kinds of works.
+
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+share and change all versions of a program--to make sure it remains free
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+any other work released this way by its authors. You can apply it to
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+the scope of its coverage, prohibits the exercise of, or is
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+or that patent license was granted, prior to 28 March 2007.
+
+ Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+ 12. No Surrender of Others' Freedom.
+
+ If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
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+covered work so as to satisfy simultaneously your obligations under this
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+not convey it at all. For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
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+ 13. Use with the GNU Affero General Public License.
+
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+
+ 14. Revised Versions of this License.
+
+ The Free Software Foundation may publish revised and/or new versions of
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+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+ Each version is given a distinguishing version number. If the
+Program specifies that a certain numbered version of the GNU General
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+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation. If the Program does not specify a version number of the
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+
+ If the Program specifies that a proxy can decide which future
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+to choose that version for the Program.
+
+ Later license versions may give you additional or different
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+author or copyright holder as a result of your choosing to follow a
+later version.
+
+ 15. Disclaimer of Warranty.
+
+ THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
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+ 16. Limitation of Liability.
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+ 17. Interpretation of Sections 15 and 16.
+
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+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+
+ Copyright (C)
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see .
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
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+ Copyright (C)
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+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+.
diff --git a/packages/api-client/README.md b/packages/api-client/README.md
new file mode 100644
index 0000000000..e69f78a5ec
--- /dev/null
+++ b/packages/api-client/README.md
@@ -0,0 +1,179 @@
+
+
+# @modrinth/api-client
+
+[](https://www.typescriptlang.org/)
+[](LICENSE)
+
+A flexible, type-safe API client for Modrinth's APIs (Labrinth, Kyros & Archon). Works across Node.js, browsers, Nuxt, and Tauri with a feature system for authentication, retries, circuit breaking and other custom processing of requests and responses.
+
+## Installation
+
+```bash
+pnpm add @modrinth/api-client
+# or
+npm install @modrinth/api-client
+# or
+yarn add @modrinth/api-client
+```
+
+## Usage
+
+### Plain JavaScript/Node.js
+
+```typescript
+import { GenericModrinthClient, AuthFeature, ProjectV2 } from '@modrinth/api-client'
+
+const client = new GenericModrinthClient({
+ userAgent: 'my-app/1.0.0',
+ features: [new AuthFeature({ token: 'mrp_...' })],
+})
+
+// Explicitly make a request using client.request
+const project: any = await client.request('/project/sodium', { api: 'labrinth', version: 2 })
+
+// Example for archon (Modrinth Servers)
+const servers = await client.request('/servers?limit=10', { api: 'archon', version: 0 })
+
+// Or use the provided wrappers for better type support.
+const project: ProjectV2 = await client.projects_v2.get('sodium')
+```
+
+### Nuxt
+
+```typescript
+import { NuxtModrinthClient, AuthFeature, NuxtCircuitBreakerStorage } from '@modrinth/api-client'
+
+// Alternatively you can create a singleton of the client and provide it via DI.
+export const useModrinthClient = () => {
+ const config = useRuntimeConfig()
+
+ // example using the useAuth composable from our frontend, replace this with whatever you're using to store auth token
+ const auth = await useAuth()
+
+ return new NuxtModrinthClient({
+ userAgent: 'my-nuxt-app/1.0.0', // leave blank to use default user agent from fetch function
+ rateLimitKey: import.meta.server ? config.rateLimitKey : undefined,
+ features: [
+ new AuthFeature({
+ token: async () => auth.value.token,
+ }),
+ new CircuitBreakerFeature({
+ storage: new NuxtCircuitBreakerStorage(),
+ }),
+ ],
+ })
+}
+
+const client = useModrinthClient()
+const project = await client.request('/project/sodium', { api: 'labrinth', version: 2 })
+```
+
+### Tauri
+
+```typescript
+import { TauriModrinthClient, AuthFeature } from '@modrinth/api-client'
+import { getVersion } from '@tauri-apps/api/app'
+
+const version = await getVersion()
+const client = new TauriModrinthClient({
+ userAgent: `modrinth/theseus/${version} (support@modrinth.com)`,
+ features: [new AuthFeature({ token: 'mrp_...' })],
+})
+
+const project = await client.request('/project/sodium', { api: 'labrinth', version: 2 })
+```
+
+### Overriding Base URLs
+
+By default, the client uses the production base URLs:
+
+- `labrinthBaseUrl`: `https://api.modrinth.com/` (Labrinth API)
+- `archonBaseUrl`: `https://archon.modrinth.com/` (Archon/Servers API)
+
+You can override these for staging environments or custom instances:
+
+```typescript
+const client = new GenericModrinthClient({
+ userAgent: 'my-app/1.0.0',
+ labrinthBaseUrl: 'https://staging-api.modrinth.com/',
+ archonBaseUrl: 'https://staging-archon.modrinth.com/',
+ features: [new AuthFeature({ token: 'mrp_...' })],
+})
+
+// Now requests will use the staging URLs
+await client.request('/project/sodium', { api: 'labrinth', version: 2 })
+// -> https://staging-api.modrinth.com/v2/project/sodium
+```
+
+You can also use custom URLs directly in requests:
+
+```typescript
+// One-off custom URL (useful for Kyros nodes or dynamic endpoints)
+await client.request('/some-endpoint', {
+ api: 'https://eu-lim16.nodes.modrinth.com/',
+ version: 0,
+})
+```
+
+## Features
+
+### Authentication
+
+Supports both static and dynamic tokens:
+
+```typescript
+// Static token
+new AuthFeature({ token: 'mrp_...' })
+
+// Dynamic token (e.g., from auth state)
+const auth = await useAuth()
+new AuthFeature({
+ token: async () => auth.value.token,
+})
+```
+
+### Retry
+
+Automatically retries failed requests with configurable backoff:
+
+```typescript
+new RetryFeature({
+ maxAttempts: 3,
+ backoffStrategy: 'exponential',
+ initialDelay: 1000,
+ maxDelay: 15000,
+})
+```
+
+### Circuit Breaker
+
+Prevents cascade failures by opening circuits after repeated failures:
+
+```typescript
+new CircuitBreakerFeature({
+ maxFailures: 3,
+ resetTimeout: 30000,
+ failureStatusCodes: [500, 502, 503, 504],
+})
+```
+
+## Documentation
+
+This package is **self-documenting** through TypeScript types and JSDoc comments. Use your IDE's IntelliSense to explore available methods, classes, and configuration options.
+
+For Modrinth API endpoints and routes, refer to the [Modrinth API Documentation](https://docs.modrinth.com).
+
+## Contributing
+
+- Modules are available in the `modules//...` folders.
+ - When a module has different versions available, you should do it like so: `modules/labrinth/projects/v2.ts` etc.
+ - Types for a module's requests should be made available in `modules//module/types.ts` or `.../types/v2.ts`.
+ - You should expose these types in the `modules/types.ts` file.
+- When creating a new module, add it to the `modules/index.ts`'s `MODULE_REGISTRY` for it to become available in the api client class.
+
+Dont forget to run `pnpm fix` before committing.
+
+## License
+
+Licensed under GPL-3.0 - see the [LICENSE](LICENSE) file for details.
diff --git a/packages/api-client/eslint.config.mjs b/packages/api-client/eslint.config.mjs
new file mode 100644
index 0000000000..3d6da7fb54
--- /dev/null
+++ b/packages/api-client/eslint.config.mjs
@@ -0,0 +1,2 @@
+import config from '@modrinth/tooling-config/eslint/nuxt.mjs'
+export default config
diff --git a/packages/api-client/package.json b/packages/api-client/package.json
new file mode 100644
index 0000000000..ecf17087bc
--- /dev/null
+++ b/packages/api-client/package.json
@@ -0,0 +1,24 @@
+{
+ "name": "@modrinth/api-client",
+ "version": "0.1.0",
+ "description": "An API client for Modrinth's API for use in nuxt, tauri and plain node/browser environments.",
+ "main": "./src/index.ts",
+ "scripts": {
+ "lint": "eslint . && prettier --check .",
+ "fix": "eslint . --fix && prettier --write ."
+ },
+ "dependencies": {
+ "ofetch": "^1.4.1"
+ },
+ "devDependencies": {
+ "@modrinth/tooling-config": "workspace:*"
+ },
+ "peerDependencies": {
+ "@tauri-apps/plugin-http": "^2.0.0"
+ },
+ "peerDependenciesMeta": {
+ "@tauri-apps/plugin-http": {
+ "optional": true
+ }
+ }
+}
diff --git a/packages/api-client/src/core/abstract-client.ts b/packages/api-client/src/core/abstract-client.ts
new file mode 100644
index 0000000000..12e3c34740
--- /dev/null
+++ b/packages/api-client/src/core/abstract-client.ts
@@ -0,0 +1,310 @@
+import type { InferredClientModules } from '../modules'
+import { buildModuleStructure } from '../modules'
+import type { ClientConfig } from '../types/client'
+import type { RequestContext, RequestOptions } from '../types/request'
+import type { AbstractFeature } from './abstract-feature'
+import type { AbstractModule } from './abstract-module'
+import { ModrinthApiError, ModrinthServerError } from './errors'
+
+/**
+ * Abstract base client for Modrinth APIs
+ */
+export abstract class AbstractModrinthClient {
+ protected config: ClientConfig
+ protected features: AbstractFeature[]
+
+ /**
+ * Maps full module ID (e.g., 'labrinth_projects_v2') to instantiated module
+ */
+ private _moduleInstances: Map = new Map()
+
+ /**
+ * Maps API name (e.g., 'labrinth') to namespace object
+ */
+ private _moduleNamespaces: Map> = new Map()
+
+ // TODO: When adding kyros/archon add readonly fields for those too.
+ public readonly labrinth!: InferredClientModules['labrinth']
+
+ constructor(config: ClientConfig) {
+ this.config = {
+ timeout: 10000,
+ labrinthBaseUrl: 'https://api.modrinth.com',
+ archonBaseUrl: 'https://archon.modrinth.com',
+ ...config,
+ }
+ this.features = config.features ?? []
+ this.initializeModules()
+ }
+
+ /**
+ * This creates the nested API structure (e.g., client.labrinth.projects_v2)
+ * but doesn't instantiate modules until first access
+ *
+ * Module IDs in the registry are validated at runtime to ensure they match
+ * what the module declares via getModuleID().
+ */
+ private initializeModules(): void {
+ const structure = buildModuleStructure()
+
+ for (const [api, modules] of Object.entries(structure)) {
+ const namespaceObj: Record = {}
+
+ // Define lazy getters for each module
+ for (const [moduleName, ModuleConstructor] of Object.entries(modules)) {
+ const fullModuleId = `${api}_${moduleName}`
+
+ Object.defineProperty(namespaceObj, moduleName, {
+ get: () => {
+ // Lazy instantiation
+ if (!this._moduleInstances.has(fullModuleId)) {
+ const instance = new ModuleConstructor(this)
+
+ // Validate the module ID matches what we expect
+ const declaredId = instance.getModuleID()
+ if (declaredId !== fullModuleId) {
+ throw new Error(
+ `Module ID mismatch: registry expects "${fullModuleId}" but module declares "${declaredId}"`,
+ )
+ }
+
+ this._moduleInstances.set(fullModuleId, instance)
+ }
+ return this._moduleInstances.get(fullModuleId)!
+ },
+ enumerable: true,
+ configurable: false,
+ })
+ }
+
+ // Assign namespace to client (e.g., this.labrinth = namespaceObj)
+ // defineProperty bypasses readonly restriction
+ Object.defineProperty(this, api, {
+ value: namespaceObj,
+ writable: false,
+ enumerable: true,
+ configurable: false,
+ })
+
+ this._moduleNamespaces.set(api, namespaceObj)
+ }
+ }
+
+ /**
+ * Make a request to the API
+ *
+ * @param path - API path (e.g., '/project/sodium')
+ * @param options - Request options
+ * @returns Promise resolving to the response data
+ * @throws {ModrinthApiError} When the request fails or features throw errors
+ */
+ async request(path: string, options: RequestOptions): Promise {
+ let baseUrl: string
+ if (options.api === 'labrinth') {
+ baseUrl = this.config.labrinthBaseUrl!
+ } else if (options.api === 'archon') {
+ baseUrl = this.config.archonBaseUrl!
+ } else {
+ baseUrl = options.api
+ }
+
+ const url = this.buildUrl(path, baseUrl, options.version)
+
+ // Merge options with defaults
+ const mergedOptions: RequestOptions = {
+ method: 'GET',
+ timeout: this.config.timeout,
+ ...options,
+ headers: {
+ ...this.buildDefaultHeaders(),
+ ...options.headers,
+ },
+ }
+
+ const context = this.buildContext(url, path, mergedOptions)
+
+ try {
+ const result = await this.executeFeatureChain(context)
+
+ await this.config.hooks?.onResponse?.(result, context)
+
+ return result
+ } catch (error) {
+ const apiError = this.normalizeError(error, context)
+ await this.config.hooks?.onError?.(apiError, context)
+
+ throw apiError
+ }
+ }
+
+ /**
+ * Execute the feature chain and the actual request
+ *
+ * Features are executed in order, with each feature calling next() to continue.
+ * The last "feature" in the chain is the actual request execution.
+ */
+ protected async executeFeatureChain(context: RequestContext): Promise {
+ // Filter to only features that should apply
+ const applicableFeatures = this.features.filter((feature) => feature.shouldApply(context))
+
+ // Build the feature chain
+ // We work backwards from the actual request, wrapping each feature around the previous
+ let index = applicableFeatures.length
+
+ const next = async (): Promise => {
+ index--
+
+ if (index >= 0) {
+ // Execute the next feature in the chain
+ const feature = applicableFeatures[index]
+ return feature.execute(next, context)
+ } else {
+ // We've reached the end of the chain, execute the actual request
+ await this.config.hooks?.onRequest?.(context)
+ return this.executeRequest(context.url, context.options)
+ }
+ }
+
+ return next()
+ }
+
+ /**
+ * Build the full URL for a request
+ */
+ protected buildUrl(path: string, baseUrl: string, version: number | 'internal'): string {
+ // Remove trailing slash from base URL
+ const base = baseUrl.replace(/\/$/, '')
+
+ // Build version path
+ let versionPath = ''
+ if (version === 'internal') {
+ versionPath = '/_internal'
+ } else if (typeof version === 'number') {
+ versionPath = `/v${version}`
+ }
+
+ const cleanPath = path.startsWith('/') ? path : `/${path}`
+
+ return `${base}${versionPath}${cleanPath}`
+ }
+
+ /**
+ * Build the request context
+ */
+ protected buildContext(url: string, path: string, options: RequestOptions): RequestContext {
+ return {
+ url,
+ path,
+ options,
+ attempt: 1,
+ startTime: Date.now(),
+ }
+ }
+
+ /**
+ * Build default headers for all requests
+ *
+ * Subclasses can override this to add platform-specific headers
+ * (e.g., Nuxt rate limit key)
+ */
+ protected buildDefaultHeaders(): Record {
+ const headers: Record = {
+ 'Content-Type': 'application/json',
+ ...this.config.headers,
+ }
+
+ if (this.config.userAgent) {
+ headers['User-Agent'] = this.config.userAgent
+ }
+
+ return headers
+ }
+
+ /**
+ * Execute the actual HTTP request
+ *
+ * This must be implemented by platform-specific clients.
+ *
+ * @param url - Full URL to request
+ * @param options - Request options
+ * @returns Promise resolving to the response data
+ * @throws {Error} Platform-specific errors that will be normalized by normalizeError()
+ */
+ protected abstract executeRequest(url: string, options: RequestOptions): Promise
+
+ /**
+ * Normalize an error into a ModrinthApiError
+ *
+ * Platform implementations should override this to handle platform-specific errors
+ * (e.g., FetchError from ofetch, Tauri HTTP errors)
+ */
+ protected normalizeError(error: unknown, context?: RequestContext): ModrinthApiError {
+ if (error instanceof ModrinthApiError) {
+ return error
+ }
+
+ return ModrinthApiError.fromUnknown(error, context?.path)
+ }
+
+ /**
+ * Helper to create a normalized error from extracted status code and response data
+ */
+ protected createNormalizedError(
+ error: Error,
+ statusCode: number | undefined,
+ responseData: unknown,
+ ): ModrinthApiError {
+ if (statusCode && responseData) {
+ return ModrinthServerError.fromResponse(statusCode, responseData)
+ }
+
+ return new ModrinthApiError(error.message, {
+ statusCode,
+ originalError: error,
+ responseData,
+ })
+ }
+
+ /**
+ * Add a feature to this client
+ *
+ * Features are executed in the order they are added.
+ *
+ * @example
+ * ```typescript
+ * const client = new GenericModrinthClient()
+ * client.addFeature(new AuthFeature({ token: 'mrp_...' }))
+ * client.addFeature(new RetryFeature({ maxAttempts: 3 }))
+ * ```
+ */
+ addFeature(feature: AbstractFeature): this {
+ this.features.push(feature)
+ return this
+ }
+
+ /**
+ * Remove a feature from this client
+ *
+ * @example
+ * ```typescript
+ * const retryFeature = new RetryFeature({ maxAttempts: 3 })
+ * client.addFeature(retryFeature)
+ * // Later, remove it
+ * client.removeFeature(retryFeature)
+ * ```
+ */
+ removeFeature(feature: AbstractFeature): this {
+ const index = this.features.indexOf(feature)
+ if (index !== -1) {
+ this.features.splice(index, 1)
+ }
+ return this
+ }
+
+ /**
+ * Get all features on this client
+ */
+ getFeatures(): AbstractFeature[] {
+ return [...this.features]
+ }
+}
diff --git a/packages/api-client/src/core/abstract-feature.ts b/packages/api-client/src/core/abstract-feature.ts
new file mode 100644
index 0000000000..c324d4a57e
--- /dev/null
+++ b/packages/api-client/src/core/abstract-feature.ts
@@ -0,0 +1,91 @@
+import type { RequestContext } from '../types/request'
+
+/**
+ * Base configuration for features
+ */
+export interface FeatureConfig {
+ /**
+ * Optional name for this feature (for debugging)
+ */
+ name?: string
+
+ /**
+ * Whether this feature is enabled
+ * @default true
+ */
+ enabled?: boolean
+}
+
+/**
+ * Abstract base class for request features
+ *
+ * Features are composable middleware that can intercept and modify requests.
+ * They are executed in a chain, with each feature calling next() to continue the chain.
+ */
+export abstract class AbstractFeature {
+ protected config: FeatureConfig
+
+ constructor(config?: FeatureConfig) {
+ this.config = {
+ enabled: true,
+ ...config,
+ }
+ }
+
+ /**
+ * Execute the feature logic
+ *
+ * @param next - Function to call the next feature in the chain (or the actual request)
+ * @param context - Full request context
+ * @returns Promise resolving to the response data
+ *
+ * @example
+ * ```typescript
+ * async execute(next: () => Promise, context: RequestContext): Promise {
+ * // Do something before request
+ * console.log('Before request:', context.url)
+ *
+ * try {
+ * const result = await next()
+ *
+ * // Do something after successful request
+ * console.log('Request succeeded')
+ *
+ * return result
+ * } catch (error) {
+ * // Handle errors
+ * console.error('Request failed:', error)
+ * throw error
+ * }
+ * }
+ * ```
+ */
+ abstract execute(next: () => Promise, context: RequestContext): Promise
+
+ /**
+ * Determine if this feature should apply to the given request
+ *
+ * By default, features apply if they are enabled.
+ * Override this to add custom logic (e.g., only apply to GET requests).
+ *
+ * @param context - Request context
+ * @returns true if the feature should execute, false to skip
+ */
+ shouldApply(_context: RequestContext): boolean {
+ return this.config.enabled !== false
+ }
+
+ /**
+ * Get the name of this feature (for debugging)
+ */
+ get name(): string {
+ return this.config.name ?? this.constructor.name
+ }
+
+ /**
+ * Check if this feature is enabled
+ */
+ get enabled(): boolean {
+ return this.config.enabled !== false
+ }
+}
diff --git a/packages/api-client/src/core/abstract-module.ts b/packages/api-client/src/core/abstract-module.ts
new file mode 100644
index 0000000000..f0a8fa8cab
--- /dev/null
+++ b/packages/api-client/src/core/abstract-module.ts
@@ -0,0 +1,15 @@
+import type { AbstractModrinthClient } from './abstract-client'
+
+export abstract class AbstractModule {
+ protected client: AbstractModrinthClient
+
+ public constructor(client: AbstractModrinthClient) {
+ this.client = client
+ }
+
+ /**
+ * Get the module's name, used for error reporting & for module field generation.
+ * @returns Module name
+ */
+ public abstract getModuleID(): string
+}
diff --git a/packages/api-client/src/core/errors.ts b/packages/api-client/src/core/errors.ts
new file mode 100644
index 0000000000..6b958eb4d2
--- /dev/null
+++ b/packages/api-client/src/core/errors.ts
@@ -0,0 +1,142 @@
+import type { ApiErrorData, ModrinthErrorResponse } from '../types/errors'
+import { isModrinthErrorResponse } from '../types/errors'
+
+/**
+ * Base error class for all Modrinth API errors
+ */
+export class ModrinthApiError extends Error {
+ /**
+ * HTTP status code (if available)
+ */
+ readonly statusCode?: number
+
+ /**
+ * Original error that was caught
+ */
+ readonly originalError?: Error
+
+ /**
+ * Response data from the API (if available)
+ */
+ readonly responseData?: unknown
+
+ /**
+ * Error context (e.g., module name, operation being performed)
+ */
+ readonly context?: string
+
+ constructor(message: string, data?: ApiErrorData) {
+ super(message)
+ this.name = 'ModrinthApiError'
+
+ this.statusCode = data?.statusCode
+ this.originalError = data?.originalError
+ this.responseData = data?.responseData
+ this.context = data?.context
+
+ // Maintains proper stack trace for where our error was thrown (only available on V8)
+ if (Error.captureStackTrace) {
+ Error.captureStackTrace(this, ModrinthApiError)
+ }
+ }
+
+ /**
+ * Create a ModrinthApiError from an unknown error
+ */
+ static fromUnknown(error: unknown, context?: string): ModrinthApiError {
+ if (error instanceof ModrinthApiError) {
+ return error
+ }
+
+ if (error instanceof Error) {
+ return new ModrinthApiError(error.message, {
+ originalError: error,
+ context,
+ })
+ }
+
+ return new ModrinthApiError(String(error), { context })
+ }
+}
+
+/**
+ * Error class for Modrinth server errors (kyros/archon)
+ * Extends ModrinthApiError with V1 error response parsing
+ */
+export class ModrinthServerError extends ModrinthApiError {
+ /**
+ * V1 error information (if available)
+ */
+ readonly v1Error?: ModrinthErrorResponse
+
+ constructor(message: string, data?: ApiErrorData & { v1Error?: ModrinthErrorResponse }) {
+ // If we have a V1 error, format the message nicely
+ let errorMessage = message
+ if (data?.v1Error) {
+ errorMessage = `[${data.v1Error.error}] ${data.v1Error.description}`
+ if (data.v1Error.context) {
+ errorMessage = `${data.v1Error.context}: ${errorMessage}`
+ }
+ }
+
+ super(errorMessage, data)
+ this.name = 'ModrinthServerError'
+ this.v1Error = data?.v1Error
+
+ if (Error.captureStackTrace) {
+ Error.captureStackTrace(this, ModrinthServerError)
+ }
+ }
+
+ /**
+ * Create a ModrinthServerError from response data
+ */
+ static fromResponse(
+ statusCode: number,
+ responseData: unknown,
+ context?: string,
+ ): ModrinthServerError {
+ const v1Error = isModrinthErrorResponse(responseData) ? responseData : undefined
+
+ let message = `HTTP ${statusCode}`
+ if (v1Error) {
+ message = v1Error.description
+ } else if (typeof responseData === 'string') {
+ message = responseData
+ }
+
+ return new ModrinthServerError(message, {
+ statusCode,
+ responseData,
+ context,
+ v1Error,
+ })
+ }
+
+ /**
+ * Create a ModrinthServerError from an unknown error
+ */
+ static fromUnknown(error: unknown, context?: string): ModrinthServerError {
+ if (error instanceof ModrinthServerError) {
+ return error
+ }
+
+ if (error instanceof ModrinthApiError) {
+ return new ModrinthServerError(error.message, {
+ statusCode: error.statusCode,
+ originalError: error.originalError,
+ responseData: error.responseData,
+ context: context ?? error.context,
+ })
+ }
+
+ if (error instanceof Error) {
+ return new ModrinthServerError(error.message, {
+ originalError: error,
+ context,
+ })
+ }
+
+ return new ModrinthServerError(String(error), { context })
+ }
+}
diff --git a/packages/api-client/src/features/auth.ts b/packages/api-client/src/features/auth.ts
new file mode 100644
index 0000000000..2b075cc6cc
--- /dev/null
+++ b/packages/api-client/src/features/auth.ts
@@ -0,0 +1,89 @@
+import { AbstractFeature, type FeatureConfig } from '../core/abstract-feature'
+import type { RequestContext } from '../types/request'
+
+/**
+ * Authentication feature configuration
+ */
+export interface AuthConfig extends FeatureConfig {
+ /**
+ * Authentication token
+ * - string: static token
+ * - function: async function that returns token (useful for dynamic tokens)
+ */
+ token: string | (() => Promise)
+
+ /**
+ * Token prefix (e.g., 'Bearer', 'Token')
+ * @default 'Bearer'
+ */
+ tokenPrefix?: string
+
+ /**
+ * Custom header name for the token
+ * @default 'Authorization'
+ */
+ headerName?: string
+}
+
+/**
+ * Authentication feature
+ *
+ * Automatically injects authentication tokens into request headers.
+ * Supports both static tokens and dynamic token providers.
+ *
+ * @example
+ * ```typescript
+ * // Static token
+ * const auth = new AuthFeature({
+ * token: 'mrp_...'
+ * })
+ *
+ * // Dynamic token (e.g., from auth state)
+ * const auth = new AuthFeature({
+ * token: async () => await getAuthToken()
+ * })
+ * ```
+ */
+export class AuthFeature extends AbstractFeature {
+ protected declare config: AuthConfig
+
+ async execute(next: () => Promise, context: RequestContext): Promise {
+ const token = await this.getToken()
+
+ if (token) {
+ const headerName = this.config.headerName ?? 'Authorization'
+ const tokenPrefix = this.config.tokenPrefix ?? 'Bearer'
+ const headerValue = tokenPrefix ? `${tokenPrefix} ${token}` : token
+
+ context.options.headers = {
+ ...context.options.headers,
+ [headerName]: headerValue,
+ }
+ }
+
+ return next()
+ }
+
+ shouldApply(context: RequestContext): boolean {
+ if (context.options.skipAuth) {
+ return false
+ }
+
+ return super.shouldApply(context)
+ }
+
+ /**
+ * Get the authentication token
+ *
+ * Handles both static tokens and async token providers
+ */
+ private async getToken(): Promise {
+ const { token } = this.config
+
+ if (typeof token === 'function') {
+ return await token()
+ }
+
+ return token
+ }
+}
diff --git a/packages/api-client/src/features/circuit-breaker.ts b/packages/api-client/src/features/circuit-breaker.ts
new file mode 100644
index 0000000000..2f850ff0ec
--- /dev/null
+++ b/packages/api-client/src/features/circuit-breaker.ts
@@ -0,0 +1,269 @@
+import { AbstractFeature, type FeatureConfig } from '../core/abstract-feature'
+import { ModrinthApiError } from '../core/errors'
+import type { RequestContext } from '../types/request'
+
+/**
+ * Circuit breaker state
+ */
+export type CircuitBreakerState = {
+ /**
+ * Number of consecutive failures
+ */
+ failures: number
+
+ /**
+ * Timestamp of last failure
+ */
+ lastFailure: number
+}
+
+/**
+ * Circuit breaker storage interface
+ */
+export interface CircuitBreakerStorage {
+ /**
+ * Get circuit breaker state for a key
+ */
+ get(key: string): CircuitBreakerState | undefined
+
+ /**
+ * Set circuit breaker state for a key
+ */
+ set(key: string, state: CircuitBreakerState): void
+
+ /**
+ * Clear circuit breaker state for a key
+ */
+ clear?(key: string): void
+}
+
+/**
+ * Circuit breaker feature configuration
+ */
+export interface CircuitBreakerConfig extends FeatureConfig {
+ /**
+ * Maximum number of consecutive failures before opening circuit
+ * @default 3
+ */
+ maxFailures?: number
+
+ /**
+ * Time in milliseconds before circuit resets after opening
+ * @default 30000
+ */
+ resetTimeout?: number
+
+ /**
+ * HTTP status codes that count as failures
+ * @default [500, 502, 503, 504]
+ */
+ failureStatusCodes?: number[]
+
+ /**
+ * Storage implementation for circuit state
+ * If not provided, uses in-memory Map
+ */
+ storage?: CircuitBreakerStorage
+
+ /**
+ * Function to generate circuit key from request context
+ * By default, uses the base path (without query params)
+ */
+ getCircuitKey?: (url: string, method: string) => string
+}
+
+/**
+ * In-memory storage for circuit breaker state
+ */
+export class InMemoryCircuitBreakerStorage implements CircuitBreakerStorage {
+ private state = new Map()
+
+ get(key: string): CircuitBreakerState | undefined {
+ return this.state.get(key)
+ }
+
+ set(key: string, state: CircuitBreakerState): void {
+ this.state.set(key, state)
+ }
+
+ clear(key: string): void {
+ this.state.delete(key)
+ }
+}
+
+/**
+ * Circuit breaker feature
+ *
+ * Prevents requests to failing endpoints by "opening the circuit" after
+ * a threshold of consecutive failures. The circuit automatically resets
+ * after a timeout period.
+ *
+ * This implements the circuit breaker pattern to prevent cascading failures
+ * and give failing services time to recover.
+ *
+ * @example
+ * ```typescript
+ * const circuitBreaker = new CircuitBreakerFeature({
+ * maxFailures: 3,
+ * resetTimeout: 30000, // 30 seconds
+ * failureStatusCodes: [500, 502, 503, 504]
+ * })
+ * ```
+ */
+export class CircuitBreakerFeature extends AbstractFeature {
+ protected declare config: Required
+ private storage: CircuitBreakerStorage
+
+ constructor(config?: CircuitBreakerConfig) {
+ super(config)
+
+ this.config = {
+ enabled: true,
+ name: 'circuit-breaker',
+ maxFailures: 3,
+ resetTimeout: 30000,
+ failureStatusCodes: [500, 502, 503, 504],
+ ...config,
+ } as Required
+
+ // Use provided storage or default to in-memory
+ this.storage = config?.storage ?? new InMemoryCircuitBreakerStorage()
+ }
+
+ async execute(next: () => Promise, context: RequestContext): Promise {
+ const circuitKey = this.getCircuitKey(context)
+
+ if (this.isCircuitOpen(circuitKey)) {
+ throw new ModrinthApiError('Circuit breaker open - too many recent failures', {
+ statusCode: 503,
+ context: context.path,
+ })
+ }
+
+ try {
+ const result = await next()
+
+ this.recordSuccess(circuitKey)
+
+ return result
+ } catch (error) {
+ if (this.isFailureError(error)) {
+ this.recordFailure(circuitKey)
+ }
+
+ throw error
+ }
+ }
+
+ shouldApply(context: RequestContext): boolean {
+ if (context.options.circuitBreaker === false) {
+ return false
+ }
+
+ return super.shouldApply(context)
+ }
+
+ /**
+ * Get the circuit key for a request
+ *
+ * By default, uses the path and method to identify unique circuits
+ */
+ private getCircuitKey(context: RequestContext): string {
+ if (this.config.getCircuitKey) {
+ return this.config.getCircuitKey(context.url, context.options.method ?? 'GET')
+ }
+
+ // Default: use method + path (without query params)
+ const method = context.options.method ?? 'GET'
+ const pathWithoutQuery = context.path.split('?')[0]
+
+ return `${method}_${pathWithoutQuery}`
+ }
+
+ /**
+ * Check if the circuit is open for a given key
+ */
+ private isCircuitOpen(key: string): boolean {
+ const state = this.storage.get(key)
+
+ if (!state) {
+ return false
+ }
+
+ const now = Date.now()
+ const timeSinceLastFailure = now - state.lastFailure
+
+ if (timeSinceLastFailure > this.config.resetTimeout) {
+ this.storage.clear?.(key)
+ return false
+ }
+
+ return state.failures >= this.config.maxFailures
+ }
+
+ /**
+ * Record a successful request
+ */
+ private recordSuccess(key: string): void {
+ this.storage.clear?.(key)
+ }
+
+ /**
+ * Record a failed request
+ */
+ private recordFailure(key: string): void {
+ const now = Date.now()
+ const state = this.storage.get(key)
+
+ if (!state) {
+ // First failure
+ this.storage.set(key, {
+ failures: 1,
+ lastFailure: now,
+ })
+ } else {
+ // Subsequent failure
+ this.storage.set(key, {
+ failures: state.failures + 1,
+ lastFailure: now,
+ })
+ }
+ }
+
+ /**
+ * Determine if an error should count as a circuit failure
+ */
+ private isFailureError(error: unknown): boolean {
+ if (error instanceof ModrinthApiError && error.statusCode) {
+ return this.config.failureStatusCodes.includes(error.statusCode)
+ }
+
+ return false
+ }
+
+ /**
+ * Get current circuit state for debugging
+ *
+ * @example
+ * ```typescript
+ * const state = circuitBreaker.getCircuitState('GET_/v2/project/sodium')
+ * console.log(`Failures: ${state?.failures}, Last failure: ${state?.lastFailure}`)
+ * ```
+ */
+ getCircuitState(key: string): CircuitBreakerState | undefined {
+ return this.storage.get(key)
+ }
+
+ /**
+ * Manually reset a circuit
+ *
+ * @example
+ * ```typescript
+ * // Reset circuit after manual intervention
+ * circuitBreaker.resetCircuit('GET_/v2/project/sodium')
+ * ```
+ */
+ resetCircuit(key: string): void {
+ this.storage.clear?.(key)
+ }
+}
diff --git a/packages/api-client/src/features/retry.ts b/packages/api-client/src/features/retry.ts
new file mode 100644
index 0000000000..d9f11ed55c
--- /dev/null
+++ b/packages/api-client/src/features/retry.ts
@@ -0,0 +1,220 @@
+import { AbstractFeature, type FeatureConfig } from '../core/abstract-feature'
+import { ModrinthApiError } from '../core/errors'
+import type { RequestContext } from '../types/request'
+
+/**
+ * Backoff strategy for retries
+ */
+export type BackoffStrategy = 'exponential' | 'linear' | 'constant'
+
+/**
+ * Retry feature configuration
+ */
+export interface RetryConfig extends FeatureConfig {
+ /**
+ * Maximum number of retry attempts
+ * @default 3
+ */
+ maxAttempts?: number
+
+ /**
+ * Backoff strategy to use
+ * @default 'exponential'
+ */
+ backoffStrategy?: BackoffStrategy
+
+ /**
+ * Initial delay in milliseconds before first retry
+ * @default 1000
+ */
+ initialDelay?: number
+
+ /**
+ * Maximum delay in milliseconds between retries
+ * @default 15000
+ */
+ maxDelay?: number
+
+ /**
+ * HTTP status codes that should trigger a retry
+ * @default [408, 429, 500, 502, 503, 504]
+ */
+ retryableStatusCodes?: number[]
+
+ /**
+ * Whether to retry on network errors (connection refused, timeout, etc.)
+ * @default true
+ */
+ retryOnNetworkError?: boolean
+
+ /**
+ * Custom function to determine if an error should be retried
+ */
+ shouldRetry?: (error: unknown, attempt: number) => boolean
+}
+
+/**
+ * Retry feature
+ *
+ * Automatically retries failed requests with configurable backoff strategy.
+ * Only retries errors that are likely to succeed on retry (e.g., timeout, 5xx errors).
+ *
+ * @example
+ * ```typescript
+ * const retry = new RetryFeature({
+ * maxAttempts: 3,
+ * backoffStrategy: 'exponential',
+ * initialDelay: 1000,
+ * maxDelay: 15000
+ * })
+ * ```
+ */
+export class RetryFeature extends AbstractFeature {
+ protected declare config: Required
+
+ constructor(config?: RetryConfig) {
+ super(config)
+
+ this.config = {
+ enabled: true,
+ name: 'retry',
+ maxAttempts: 3,
+ backoffStrategy: 'exponential',
+ initialDelay: 1000,
+ maxDelay: 15000,
+ retryableStatusCodes: [408, 429, 500, 502, 503, 504],
+ retryOnNetworkError: true,
+ ...config,
+ } as Required
+ }
+
+ async execute(next: () => Promise, context: RequestContext): Promise {
+ let lastError: Error | null = null
+ const maxAttempts = this.getMaxAttempts(context)
+
+ for (let attempt = 1; attempt <= maxAttempts; attempt++) {
+ context.attempt = attempt
+
+ try {
+ const result = await next()
+ return result
+ } catch (error) {
+ lastError = error as Error
+
+ const shouldRetry = this.shouldRetryError(error, attempt, maxAttempts)
+
+ if (!shouldRetry || attempt >= maxAttempts) {
+ throw error
+ }
+
+ const delay = this.calculateDelay(attempt)
+
+ console.warn(
+ `[${this.name}] Retrying request to ${context.path} (attempt ${attempt + 1}/${maxAttempts}) after ${delay}ms`,
+ )
+
+ await this.sleep(delay)
+ }
+ }
+
+ // This shouldn't be reached, but TypeScript requires it
+ throw lastError ?? new Error('Max retry attempts reached')
+ }
+
+ shouldApply(context: RequestContext): boolean {
+ if (context.options.retry === false) {
+ return false
+ }
+
+ return super.shouldApply(context)
+ }
+
+ /**
+ * Determine if an error should be retried
+ */
+ private shouldRetryError(error: unknown, attempt: number, _maxAttempts: number): boolean {
+ if (this.config.shouldRetry) {
+ return this.config.shouldRetry(error, attempt)
+ }
+
+ if (this.config.retryOnNetworkError && this.isNetworkError(error)) {
+ return true
+ }
+
+ if (error instanceof ModrinthApiError && error.statusCode) {
+ return this.config.retryableStatusCodes.includes(error.statusCode)
+ }
+
+ return false
+ }
+
+ /**
+ * Check if an error is a network error
+ */
+ private isNetworkError(error: unknown): boolean {
+ // Common network error indicators
+ const networkErrorPatterns = [
+ /network/i,
+ /timeout/i,
+ /ECONNREFUSED/i,
+ /ENOTFOUND/i,
+ /ETIMEDOUT/i,
+ /ECONNRESET/i,
+ ]
+
+ const errorMessage = error?.message ?? String(error)
+ return networkErrorPatterns.some((pattern) => pattern.test(errorMessage))
+ }
+
+ /**
+ * Get max attempts for this request
+ */
+ private getMaxAttempts(context: RequestContext): number {
+ if (typeof context.options.retry === 'number') {
+ return context.options.retry
+ }
+
+ return this.config.maxAttempts
+ }
+
+ /**
+ * Calculate delay before next retry based on backoff strategy
+ */
+ private calculateDelay(attempt: number): number {
+ const { backoffStrategy, initialDelay, maxDelay } = this.config
+
+ let delay: number
+
+ switch (backoffStrategy) {
+ case 'exponential':
+ // Exponential: delay = initialDelay * 2^(attempt-1)
+ delay = initialDelay * Math.pow(2, attempt - 1)
+ break
+
+ case 'linear':
+ // Linear: delay = initialDelay * attempt
+ delay = initialDelay * attempt
+ break
+
+ case 'constant':
+ // Constant: delay = initialDelay
+ delay = initialDelay
+ break
+
+ default:
+ delay = initialDelay
+ }
+
+ // Add jitter (random 0-1000ms) to prevent thundering herd
+ delay += Math.random() * 1000
+
+ return Math.min(delay, maxDelay)
+ }
+
+ /**
+ * Sleep for a given duration
+ */
+ private sleep(ms: number): Promise {
+ return new Promise((resolve) => setTimeout(resolve, ms))
+ }
+}
diff --git a/packages/api-client/src/features/verbose-logging.ts b/packages/api-client/src/features/verbose-logging.ts
new file mode 100644
index 0000000000..da88bcabee
--- /dev/null
+++ b/packages/api-client/src/features/verbose-logging.ts
@@ -0,0 +1,30 @@
+import { AbstractFeature, type FeatureConfig } from '../core/abstract-feature'
+import type { RequestContext } from '../types/request'
+
+export type VerboseLoggingConfig = FeatureConfig
+
+export class VerboseLoggingFeature extends AbstractFeature {
+ async execute(next: () => Promise, context: RequestContext): Promise {
+ const method = context.options.method ?? 'GET'
+ const api = context.options.api
+ const version = context.options.version
+ const prefix = `[${method}] [${api}_v${version}]`
+
+ console.debug(`${prefix} ${context.url} SENT`)
+
+ try {
+ const result = await next()
+ try {
+ const size = result ? JSON.stringify(result) : 0
+ console.debug(`${prefix} ${context.url} RECEIVED ${size} bytes`)
+ } catch {
+ // ignore size calc fail
+ console.debug(`${prefix} ${context.url} RECEIVED`)
+ }
+ return result
+ } catch (error) {
+ console.debug(`${prefix} ${context.url} FAILED`)
+ throw error
+ }
+ }
+}
diff --git a/packages/api-client/src/index.ts b/packages/api-client/src/index.ts
new file mode 100644
index 0000000000..106c7e4f92
--- /dev/null
+++ b/packages/api-client/src/index.ts
@@ -0,0 +1,21 @@
+export { AbstractModrinthClient } from './core/abstract-client'
+export { AbstractFeature, type FeatureConfig } from './core/abstract-feature'
+export { ModrinthApiError, ModrinthServerError } from './core/errors'
+export { type AuthConfig, AuthFeature } from './features/auth'
+export {
+ type CircuitBreakerConfig,
+ CircuitBreakerFeature,
+ type CircuitBreakerState,
+ type CircuitBreakerStorage,
+ InMemoryCircuitBreakerStorage,
+} from './features/circuit-breaker'
+export { type BackoffStrategy, type RetryConfig, RetryFeature } from './features/retry'
+export { type VerboseLoggingConfig, VerboseLoggingFeature } from './features/verbose-logging'
+export type { InferredClientModules } from './modules'
+export * from './modules/types'
+export { GenericModrinthClient } from './platform/generic'
+export type { NuxtClientConfig } from './platform/nuxt'
+export { NuxtCircuitBreakerStorage, NuxtModrinthClient } from './platform/nuxt'
+export type { TauriClientConfig } from './platform/tauri'
+export { TauriModrinthClient } from './platform/tauri'
+export * from './types'
diff --git a/packages/api-client/src/modules/archon/.gitkeep b/packages/api-client/src/modules/archon/.gitkeep
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/packages/api-client/src/modules/index.ts b/packages/api-client/src/modules/index.ts
new file mode 100644
index 0000000000..ec2c81ec5e
--- /dev/null
+++ b/packages/api-client/src/modules/index.ts
@@ -0,0 +1,106 @@
+import type { AbstractModrinthClient } from '../core/abstract-client'
+import type { AbstractModule } from '../core/abstract-module'
+import { LabrinthProjectsV2Module } from './labrinth/projects/v2'
+import { LabrinthProjectsV3Module } from './labrinth/projects/v3'
+
+type ModuleConstructor = new (client: AbstractModrinthClient) => AbstractModule
+
+/**
+ * To add a new module:
+ * 1. Create your module class extending AbstractModule
+ * 2. Add one line here: `_: YourModuleClass`
+ *
+ * TypeScript will automatically infer the client's field structure from this registry.
+ *
+ * TODO: Better way? Probably not
+ */
+export const MODULE_REGISTRY = {
+ labrinth_projects_v2: LabrinthProjectsV2Module,
+ labrinth_projects_v3: LabrinthProjectsV3Module,
+} as const satisfies Record
+
+export type ModuleID = keyof typeof MODULE_REGISTRY
+
+/**
+ * Parse a module ID into [api, moduleName] tuple
+ *
+ * @param id - Module ID in format `_` (e.g., 'labrinth_projects_v2')
+ * @returns Tuple of [api, moduleName] (e.g., ['labrinth', 'projects_v2'])
+ * @throws Error if module ID doesn't match expected format
+ */
+export function parseModuleID(id: string): [string, string] {
+ const parts = id.split('_')
+ if (parts.length < 2) {
+ throw new Error(
+ `Invalid module ID "${id}". Expected format: _ (e.g., "labrinth_projects_v2")`,
+ )
+ }
+ const api = parts[0]
+ const moduleName = parts.slice(1).join('_')
+ return [api, moduleName]
+}
+
+/**
+ * Build nested module structure from flat registry
+ *
+ * Transforms:
+ * ```
+ * { labrinth_projects_v2: Constructor, labrinth_users_v2: Constructor }
+ * ```
+ * Into:
+ * ```
+ * { labrinth: { projects_v2: Constructor, users_v2: Constructor } }
+ * ```
+ *
+ * @returns Nested structure organized by API namespace
+ */
+export function buildModuleStructure(): Record> {
+ const structure: Record> = {}
+
+ for (const [id, constructor] of Object.entries(MODULE_REGISTRY)) {
+ const [api, moduleName] = parseModuleID(id)
+
+ if (!structure[api]) {
+ structure[api] = {}
+ }
+
+ structure[api][moduleName] = constructor
+ }
+
+ return structure
+}
+
+/**
+ * Extract API name from module ID
+ * @example ParseAPI<'labrinth_projects_v2'> = 'labrinth'
+ */
+type ParseAPI = T extends `${infer API}_${string}` ? API : never
+
+/**
+ * Extract module name for a given API
+ * @example ParseModule<'labrinth_projects_v2', 'labrinth'> = 'projects_v2'
+ */
+type ParseModule = T extends `${API}_${infer Module}`
+ ? Module
+ : never
+
+/**
+ * Group registry modules by API namespace
+ *
+ * Transforms flat registry into nested structure at the type level:
+ * ```
+ * { labrinth_projects_v2: ModuleClass } → { labrinth: { projects_v2: ModuleInstance } }
+ * ```
+ */
+type GroupByAPI> = {
+ [API in ParseAPI]: {
+ [Module in ParseModule]: InstanceType<
+ Registry[`${API}_${Module}`]
+ >
+ }
+}
+
+/**
+ * Inferred client module structure
+ **/
+export type InferredClientModules = GroupByAPI
diff --git a/packages/api-client/src/modules/kyros/.gitkeep b/packages/api-client/src/modules/kyros/.gitkeep
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/packages/api-client/src/modules/labrinth/index.ts b/packages/api-client/src/modules/labrinth/index.ts
new file mode 100644
index 0000000000..b5961a1c3b
--- /dev/null
+++ b/packages/api-client/src/modules/labrinth/index.ts
@@ -0,0 +1,2 @@
+export * from './projects/v2'
+export * from './projects/v3'
diff --git a/packages/api-client/src/modules/labrinth/projects/types/v2.ts b/packages/api-client/src/modules/labrinth/projects/types/v2.ts
new file mode 100644
index 0000000000..92f0d7cd58
--- /dev/null
+++ b/packages/api-client/src/modules/labrinth/projects/types/v2.ts
@@ -0,0 +1,115 @@
+export type Environment = 'required' | 'optional' | 'unsupported' | 'unknown'
+
+export type ProjectStatus =
+ | 'approved'
+ | 'archived'
+ | 'rejected'
+ | 'draft'
+ | 'unlisted'
+ | 'processing'
+ | 'withheld'
+ | 'scheduled'
+ | 'private'
+ | 'unknown'
+
+export type MonetizationStatus = 'monetized' | 'demonetized' | 'force-demonetized'
+
+export type ProjectType = 'mod' | 'modpack' | 'resourcepack' | 'shader' | 'plugin' | 'datapack'
+
+export type GalleryImageV2 = {
+ url: string
+ featured: boolean
+ title?: string
+ description?: string
+ created: string
+ ordering: number
+}
+
+export type DonationLinkV2 = {
+ id: string
+ platform: string
+ url: string
+}
+
+export type ProjectV2 = {
+ id: string
+ slug: string
+ project_type: ProjectType
+ team: string
+ title: string
+ description: string
+ body: string
+ published: string
+ updated: string
+ approved?: string
+ queued?: string
+ status: ProjectStatus
+ requested_status?: ProjectStatus
+ moderator_message?: {
+ message: string
+ body?: string
+ }
+ license: {
+ id: string
+ name: string
+ url?: string
+ }
+ client_side: Environment
+ server_side: Environment
+ downloads: number
+ followers: number
+ categories: string[]
+ additional_categories: string[]
+ game_versions: string[]
+ loaders: string[]
+ versions: string[]
+ icon_url?: string
+ issues_url?: string
+ source_url?: string
+ wiki_url?: string
+ discord_url?: string
+ donation_urls?: DonationLinkV2[]
+ gallery?: GalleryImageV2[]
+ color?: number
+ thread_id: string
+ monetization_status: MonetizationStatus
+}
+
+export type SearchResultHit = {
+ project_id: string
+ project_type: ProjectType
+ slug: string
+ author: string
+ title: string
+ description: string
+ categories: string[]
+ display_categories: string[]
+ versions: string[]
+ downloads: number
+ follows: number
+ icon_url: string
+ date_created: string
+ date_modified: string
+ latest_version?: string
+ license: string
+ client_side: Environment
+ server_side: Environment
+ gallery: string[]
+ color?: number
+}
+
+export type SearchResult = {
+ hits: SearchResultHit[]
+ offset: number
+ limit: number
+ total_hits: number
+}
+
+export type ProjectSearchParams = {
+ query?: string
+ facets?: string[][]
+ filters?: string
+ index?: 'relevance' | 'downloads' | 'follows' | 'newest' | 'updated'
+ offset?: number
+ limit?: number
+}
diff --git a/packages/api-client/src/modules/labrinth/projects/types/v3.ts b/packages/api-client/src/modules/labrinth/projects/types/v3.ts
new file mode 100644
index 0000000000..3b23f86be7
--- /dev/null
+++ b/packages/api-client/src/modules/labrinth/projects/types/v3.ts
@@ -0,0 +1,54 @@
+import type { MonetizationStatus, ProjectStatus } from './v2'
+
+export type GalleryItemV3 = {
+ url: string
+ raw_url: string
+ featured: boolean
+ name?: string
+ description?: string
+ created: string
+ ordering: number
+}
+
+export type LinkV3 = {
+ platform: string
+ donation: boolean
+ url: string
+}
+
+export type ProjectV3 = {
+ id: string
+ slug?: string
+ project_types: string[]
+ games: string[]
+ team_id: string
+ organization?: string
+ name: string
+ summary: string
+ description: string
+ published: string
+ updated: string
+ approved?: string
+ queued?: string
+ status: ProjectStatus
+ requested_status?: ProjectStatus
+ license: {
+ id: string
+ name: string
+ url?: string
+ }
+ downloads: number
+ followers: number
+ categories: string[]
+ additional_categories: string[]
+ loaders: string[]
+ versions: string[]
+ icon_url?: string
+ link_urls: Record
+ gallery: GalleryItemV3[]
+ color?: number
+ thread_id: string
+ monetization_status: MonetizationStatus
+ side_types_migration_review_status: 'reviewed' | 'pending'
+ [key: string]: unknown
+}
diff --git a/packages/api-client/src/modules/labrinth/projects/v2.ts b/packages/api-client/src/modules/labrinth/projects/v2.ts
new file mode 100644
index 0000000000..b14c80fff5
--- /dev/null
+++ b/packages/api-client/src/modules/labrinth/projects/v2.ts
@@ -0,0 +1,112 @@
+import { AbstractModule } from '../../../core/abstract-module'
+import type { ProjectSearchParams, ProjectV2, SearchResult } from './types/v2'
+
+export class LabrinthProjectsV2Module extends AbstractModule {
+ public getModuleID(): string {
+ return 'labrinth_projects_v2'
+ }
+
+ /**
+ * Get a project by ID or slug
+ *
+ * @param id - Project ID or slug (e.g., 'sodium' or 'AANobbMI')
+ * @returns Promise resolving to the project data
+ *
+ * @example
+ * ```typescript
+ * const project = await client.labrinth.projects_v2.get('sodium')
+ * console.log(project.title) // "Sodium"
+ * ```
+ */
+ public async get(id: string): Promise {
+ return this.client.request(`/project/${id}`, {
+ api: 'labrinth',
+ version: 2,
+ method: 'GET',
+ })
+ }
+
+ /**
+ * Get multiple projects by IDs
+ *
+ * @param ids - Array of project IDs or slugs
+ * @returns Promise resolving to array of projects
+ *
+ * @example
+ * ```typescript
+ * const projects = await client.labrinth.projects_v2.getMultiple(['sodium', 'lithium', 'phosphor'])
+ * ```
+ */
+ public async getMultiple(ids: string[]): Promise {
+ return this.client.request(`/projects`, {
+ api: 'labrinth',
+ version: 2,
+ method: 'GET',
+ params: { ids: JSON.stringify(ids) },
+ })
+ }
+
+ /**
+ * Search projects
+ *
+ * @param params - Search parameters (query, facets, filters, etc.)
+ * @returns Promise resolving to search results
+ *
+ * @example
+ * ```typescript
+ * const results = await client.labrinth.projects_v2.search({
+ * query: 'optimization',
+ * facets: [['categories:optimization'], ['project_type:mod']],
+ * limit: 20
+ * })
+ * ```
+ */
+ public async search(params: ProjectSearchParams): Promise {
+ return this.client.request(`/search`, {
+ api: 'labrinth',
+ version: 2,
+ method: 'GET',
+ params: params as Record,
+ })
+ }
+
+ /**
+ * Edit a project
+ *
+ * @param id - Project ID or slug
+ * @param data - Project update data
+ *
+ * @example
+ * ```typescript
+ * await client.labrinth.projects_v2.edit('sodium', {
+ * description: 'Updated description'
+ * })
+ * ```
+ */
+ public async edit(id: string, data: Partial): Promise {
+ return this.client.request(`/project/${id}`, {
+ api: 'labrinth',
+ version: 2,
+ method: 'PATCH',
+ body: data,
+ })
+ }
+
+ /**
+ * Delete a project
+ *
+ * @param id - Project ID or slug
+ *
+ * @example
+ * ```typescript
+ * await client.labrinth.projects_v2.delete('my-project')
+ * ```
+ */
+ public async delete(id: string): Promise {
+ return this.client.request(`/project/${id}`, {
+ api: 'labrinth',
+ version: 2,
+ method: 'DELETE',
+ })
+ }
+}
diff --git a/packages/api-client/src/modules/labrinth/projects/v3.ts b/packages/api-client/src/modules/labrinth/projects/v3.ts
new file mode 100644
index 0000000000..0dd397d074
--- /dev/null
+++ b/packages/api-client/src/modules/labrinth/projects/v3.ts
@@ -0,0 +1,70 @@
+import { AbstractModule } from '../../../core/abstract-module'
+import type { ProjectV3 } from './types/v3'
+
+export class LabrinthProjectsV3Module extends AbstractModule {
+ public getModuleID(): string {
+ return 'labrinth_projects_v3'
+ }
+
+ /**
+ * Get a project by ID or slug (v3)
+ *
+ * @param id - Project ID or slug (e.g., 'sodium' or 'AANobbMI')
+ * @returns Promise resolving to the v3 project data
+ *
+ * @example
+ * ```typescript
+ * const project = await client.labrinth.projects_v3.get('sodium')
+ * console.log(project.project_types) // v3 field
+ * ```
+ */
+ public async get(id: string): Promise {
+ return this.client.request(`/project/${id}`, {
+ api: 'labrinth',
+ version: 3,
+ method: 'GET',
+ })
+ }
+
+ /**
+ * Get multiple projects by IDs (v3)
+ *
+ * @param ids - Array of project IDs or slugs
+ * @returns Promise resolving to array of v3 projects
+ *
+ * @example
+ * ```typescript
+ * const projects = await client.labrinth.projects_v3.getMultiple(['sodium', 'lithium'])
+ * ```
+ */
+ public async getMultiple(ids: string[]): Promise {
+ return this.client.request(`/projects`, {
+ api: 'labrinth',
+ version: 3,
+ method: 'GET',
+ params: { ids: JSON.stringify(ids) },
+ })
+ }
+
+ /**
+ * Edit a project (v3)
+ *
+ * @param id - Project ID or slug
+ * @param data - Project update data (v3 fields)
+ *
+ * @example
+ * ```typescript
+ * await client.labrinth.projects_v3.edit('sodium', {
+ * environment: 'client_and_server'
+ * })
+ * ```
+ */
+ public async edit(id: string, data: Partial): Promise {
+ return this.client.request(`/project/${id}`, {
+ api: 'labrinth',
+ version: 3,
+ method: 'PATCH',
+ body: data,
+ })
+ }
+}
diff --git a/packages/api-client/src/modules/types.ts b/packages/api-client/src/modules/types.ts
new file mode 100644
index 0000000000..6540671ed8
--- /dev/null
+++ b/packages/api-client/src/modules/types.ts
@@ -0,0 +1,2 @@
+export * from './labrinth/projects/types/v2'
+export * from './labrinth/projects/types/v3'
diff --git a/packages/api-client/src/platform/generic.ts b/packages/api-client/src/platform/generic.ts
new file mode 100644
index 0000000000..6d4c3280b6
--- /dev/null
+++ b/packages/api-client/src/platform/generic.ts
@@ -0,0 +1,51 @@
+import { $fetch, FetchError } from 'ofetch'
+
+import { AbstractModrinthClient } from '../core/abstract-client'
+import type { ModrinthApiError } from '../core/errors'
+import type { RequestOptions } from '../types/request'
+
+/**
+ * Generic platform client using ofetch
+ *
+ * This client works in any JavaScript environment (Node.js, browser, workers).
+ *
+ * @example
+ * ```typescript
+ * const client = new GenericModrinthClient({
+ * userAgent: 'my-app/1.0.0',
+ * features: [
+ * new AuthFeature({ token: 'mrp_...' }),
+ * new RetryFeature({ maxAttempts: 3 })
+ * ]
+ * })
+ *
+ * const project = await client.request('/project/sodium', { api: 'labrinth', version: 2 })
+ * ```
+ */
+export class GenericModrinthClient extends AbstractModrinthClient {
+ protected async executeRequest(url: string, options: RequestOptions): Promise {
+ try {
+ const response = await $fetch(url, {
+ method: options.method ?? 'GET',
+ headers: options.headers,
+ body: options.body as BodyInit,
+ params: options.params as Record,
+ timeout: options.timeout,
+ signal: options.signal,
+ })
+
+ return response
+ } catch (error) {
+ // ofetch throws FetchError for HTTP errors
+ throw this.normalizeError(error)
+ }
+ }
+
+ protected normalizeError(error: unknown): ModrinthApiError {
+ if (error instanceof FetchError) {
+ return this.createNormalizedError(error, error.response?.status, error.data)
+ }
+
+ return super.normalizeError(error)
+ }
+}
diff --git a/packages/api-client/src/platform/nuxt.ts b/packages/api-client/src/platform/nuxt.ts
new file mode 100644
index 0000000000..b4daecc573
--- /dev/null
+++ b/packages/api-client/src/platform/nuxt.ts
@@ -0,0 +1,113 @@
+import { FetchError } from 'ofetch'
+
+import { AbstractModrinthClient } from '../core/abstract-client'
+import type { ModrinthApiError } from '../core/errors'
+import type { CircuitBreakerState, CircuitBreakerStorage } from '../features/circuit-breaker'
+import type { ClientConfig } from '../types/client'
+import type { RequestOptions } from '../types/request'
+
+/**
+ * Circuit breaker storage using Nuxt's useState
+ *
+ * This provides cross-request persistence in SSR while also working in client-side.
+ * State is shared between requests in the same Nuxt context.
+ */
+export class NuxtCircuitBreakerStorage implements CircuitBreakerStorage {
+ private getState(): Map {
+ // @ts-expect-error - useState is provided by Nuxt runtime
+ const state = useState