🔤 vue-case

Professional Case Transformation Library for Vue 3

Transform strings between 19+ case formats with full TypeScript support

Features • Installation • Quick Start • API Reference • Examples • Documentation • Live Demo

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🌟 Highlights

⚠️ Version 2.0 - Complete rewrite for Vue 3 with full TypeScript support and 100% test coverage. For Vue 2, use version 1.x.

import { camelCase, pascalCase, snakeCase } from 'vue-case';

camelCase('hello world')    // → 'helloWorld'
pascalCase('hello world')   // → 'HelloWorld'
snakeCase('hello world')    // → 'hello_world'

✨ Features

🎯 Core Features ✅ 19+ Case Transformations ✅ 100% Test Coverage ✅ Full TypeScript Support ✅ Zero Configuration ✅ Tree Shakeable

🚀 Vue 3 Integration ✅ Composition API with useCase() ✅ Options API with global $methods ✅ Direct Imports for flexibility ✅ Plugin System for global access ✅ CDN Support for quick prototyping

📦 Installation

npm npm install vue-case

pnpm pnpm add vue-case

yarn yarn add vue-case

CDN Usage

<!-- Vue 3 -->
<script src="https://unpkg.com/vue@3"></script>
<!-- vue-case -->
<script src="https://unpkg.com/vue-case@2"></script>

<script>
  const { createApp } = Vue;
  const app = createApp({
    template: '<div>{{ $camelCase("hello world") }}</div>'
  });
  app.use(VueCase);
  app.mount('#app');
</script>

🚀 Quick Start

🔵 Composition API (Recommended)

<template>
  <div class="converter">
    <input v-model="text" placeholder="Enter text..." />
    <div class="results">
      <p>camelCase: <code>{{ camelCase(text) }}</code></p>
      <p>PascalCase: <code>{{ pascalCase(text) }}</code></p>
      <p>snake_case: <code>{{ snakeCase(text) }}</code></p>
      <p>kebab-case: <code>{{ paramCase(text) }}</code></p>
    </div>
  </div>
</template>

<script setup lang="ts">
import { ref } from 'vue';
import { useCase } from 'vue-case';

const { camelCase, pascalCase, snakeCase, paramCase } = useCase();
const text = ref('Hello World');
</script>

🟢 Options API

<template>
  <div>
    <p>{{ $camelCase(username) }}</p>
    <p>{{ $snakeCase(username) }}</p>
    <p>{{ $truncate(description, 50) }}</p>
  </div>
</template>

<script lang="ts">
import { defineComponent } from 'vue';

export default defineComponent({
  data() {
    return {
      username: 'John Doe',
      description: 'A very long description text...'
    };
  }
});
</script>

🟣 Direct Imports (Tree-Shakeable)

import { camelCase, pascalCase, snakeCase, constantCase } from 'vue-case';

// Use anywhere in your code
const apiEndpoint = camelCase('user profile');     // 'userProfile'
const className = pascalCase('my component');      // 'MyComponent'
const dbColumn = snakeCase('user name');          // 'user_name'
const envVar = constantCase('api key');           // 'API_KEY'

📖 Usage Guide

1️⃣ Plugin Installation (Global Access)

Setup in main.ts:

import { createApp } from 'vue';
import VueCase from 'vue-case';
import App from './App.vue';

const app = createApp(App);

// Install plugin globally
app.use(VueCase);

app.mount('#app');

Use in any component:

<template>
  <div>
    <!-- Available as $camelCase, $pascalCase, $snakeCase, etc. -->
    <h1>{{ $titleCase(pageTitle) }}</h1>
    <p>{{ $truncate(content, 100) }}</p>
  </div>
</template>

2️⃣ Composition API with useCase()

<script setup lang="ts">
import { useCase } from 'vue-case';
import { ref, computed } from 'vue';

// Get all transformation methods
const { camelCase, pascalCase, snakeCase, constantCase, truncate } = useCase();

const inputText = ref('user profile settings');

// Use in computed properties
const apiRoute = computed(() => camelCase(inputText.value));
const component = computed(() => pascalCase(inputText.value));
const database = computed(() => snakeCase(inputText.value));
const environment = computed(() => constantCase(inputText.value));
</script>

<template>
  <div>
    <input v-model="inputText" />
    <ul>
      <li>API: {{ apiRoute }}</li>
      <li>Component: {{ component }}</li>
      <li>Database: {{ database }}</li>
      <li>Environment: {{ environment }}</li>
    </ul>
  </div>
</template>

3️⃣ TypeScript Integration

import type { 
  CaseMethods, 
  CaseTransformFn,
  CaseCheckFn,
  TruncateFn,
  VueCaseOptions
} from 'vue-case';
import { camelCase, pascalCase, useCase } from 'vue-case';

// Type-safe function
const transformUserInput: CaseTransformFn = (input: string) => {
  return camelCase(input);
};

// Type-safe composable usage
const caseMethods: CaseMethods = useCase();

// Use in classes
class StringTransformer {
  private transform: CaseTransformFn;

  constructor() {
    this.transform = pascalCase;
  }

  process(input: string): string {
    return this.transform(input);
  }
}

🎨 Available Methods

📋 Complete Transformation Reference

Method	Input	Output	Use Case
camelCase	'hello world'	'helloWorld'	JavaScript variables, object keys
pascalCase	'hello world'	'HelloWorld'	Component names, class names
snakeCase	'hello world'	'hello_world'	Database columns, Python variables
constantCase	'hello world'	'HELLO_WORLD'	Environment variables, constants
paramCase	'hello world'	'hello-world'	URLs, CSS classes, file names
dotCase	'hello world'	'hello.world'	Object paths, configuration keys
pathCase	'hello world'	'hello/world'	File paths, routes
headerCase	'hello world'	'Hello-World'	HTTP headers
capitalCase	'hello world'	'Hello World'	Titles, display names
titleCase	'hello world'	'Hello World'	Book titles, headings
sentenceCase	'HELLO WORLD'	'Hello world'	Sentences, descriptions
noCase	'helloWorld'	'hello world'	Remove formatting
lowerCase	'HELLO WORLD'	'hello world'	Normalize to lowercase
upperCase	'hello world'	'HELLO WORLD'	Normalize to uppercase
lowerCaseFirst	'Hello'	'hello'	Lowercase first letter
upperCaseFirst	'hello'	'Hello'	Capitalize first letter
swapCase	'Hello World'	'hELLO wORLD'	Toggle case

🛠️ Utility Methods

Method	Signature	Description	Example
truncate	(text: string, length?: number)	Truncate text with "..."	truncate('Hello World', 5) → 'Hello...'
isLowerCase	(text: string): boolean	Check if lowercase	isLowerCase('hello') → true
isUpperCase	(text: string): boolean	Check if uppercase	isUpperCase('HELLO') → true

💡 Real-World Examples

🔹 Example 1: API Request/Response Transformer

import { camelCase, snakeCase } from 'vue-case';

// Transform snake_case API responses to camelCase
function transformResponse<T extends Record<string, any>>(data: T): Record<string, any> {
  return Object.entries(data).reduce((acc, [key, value]) => {
    acc[camelCase(key)] = value;
    return acc;
  }, {} as Record<string, any>);
}

// Transform camelCase to snake_case for API requests
function transformRequest<T extends Record<string, any>>(data: T): Record<string, any> {
  return Object.entries(data).reduce((acc, [key, value]) => {
    acc[snakeCase(key)] = value;
    return acc;
  }, {} as Record<string, any>);
}

// Usage with Axios
import axios from 'axios';

const api = axios.create({
  baseURL: 'https://api.example.com',
  transformResponse: [(data) => {
    const parsed = JSON.parse(data);
    return transformResponse(parsed);
  }],
  transformRequest: [(data) => {
    return JSON.stringify(transformRequest(data));
  }]
});

// Now your API calls work seamlessly:
const response = await api.get('/user_profile'); // API returns user_name
console.log(response.data.userName); // Access as userName

🔹 Example 2: Dynamic Component Generator

<template>
  <component 
    :is="getComponent(type)" 
    :class="getClassName(type)"
  >
    {{ content }}
  </component>
</template>

<script setup lang="ts">
import { computed } from 'vue';
import { pascalCase, paramCase } from 'vue-case';

interface Props {
  type: string;
  content: string;
}

const props = defineProps<Props>();

// Convert 'user card' → 'UserCard' for component name
const getComponent = (type: string) => {
  return pascalCase(type);
};

// Convert 'user card' → 'user-card' for CSS class
const getClassName = (type: string) => {
  return `component-${paramCase(type)}`;
};
</script>

🔹 Example 3: Form Field Generator

<template>
  <form @submit.prevent="handleSubmit">
    <div v-for="field in formFields" :key="field.name">
      <label :for="field.id">{{ field.label }}</label>
      <input 
        :id="field.id"
        :name="field.name"
        v-model="formData[field.name]"
      />
    </div>
    <button type="submit">Submit</button>
  </form>
</template>

<script setup lang="ts">
import { ref, computed } from 'vue';
import { camelCase, paramCase, capitalCase } from 'vue-case';

const fieldNames = ['user name', 'email address', 'phone number'];

const formFields = computed(() => 
  fieldNames.map(name => ({
    name: camelCase(name),        // 'userName' for v-model
    id: paramCase(name),           // 'user-name' for id/for
    label: capitalCase(name)       // 'User Name' for display
  }))
);

const formData = ref(
  fieldNames.reduce((acc, name) => {
    acc[camelCase(name)] = '';
    return acc;
  }, {} as Record<string, string>)
);

const handleSubmit = () => {
  console.log(formData.value);
  // { userName: '...', emailAddress: '...', phoneNumber: '...' }
};
</script>

🔹 Example 4: URL Slug Generator

<template>
  <div class="blog-editor">
    <input 
      v-model="title" 
      placeholder="Blog post title"
      @input="generateSlug"
    />
    <p class="slug-preview">
      URL: <code>{{ baseUrl }}/{{ slug }}</code>
    </p>
    <button @click="copySlug">Copy URL</button>
  </div>
</template>

<script setup lang="ts">
import { ref, computed } from 'vue';
import { paramCase } from 'vue-case';

const title = ref('');
const baseUrl = 'https://myblog.com/posts';

const slug = computed(() => paramCase(title.value));

const generateSlug = () => {
  // Automatically updates via computed property
};

const copySlug = async () => {
  await navigator.clipboard.writeText(`${baseUrl}/${slug.value}`);
  alert('URL copied!');
};
</script>

🔹 Example 5: Environment Variable Manager

import { constantCase, camelCase } from 'vue-case';

class EnvironmentConfig {
  private config: Record<string, string> = {};

  // Load from process.env
  loadFromEnv() {
    this.config = {
      [camelCase('API_KEY')]: process.env.API_KEY || '',
      [camelCase('DATABASE_URL')]: process.env.DATABASE_URL || '',
      [camelCase('APP_NAME')]: process.env.APP_NAME || '',
    };
    return this.config;
  }

  // Generate .env content
  generateEnvFile(config: Record<string, string>): string {
    return Object.entries(config)
      .map(([key, value]) => `${constantCase(key)}=${value}`)
      .join('\n');
  }
}

// Usage
const env = new EnvironmentConfig();
const config = {
  apiKey: 'secret123',
  databaseUrl: 'postgresql://...',
  appName: 'My App'
};

console.log(env.generateEnvFile(config));
// Output:
// API_KEY=secret123
// DATABASE_URL=postgresql://...
// APP_NAME=My App

🔹 Example 6: CSS Class Generator

<template>
  <div :class="bem('container')">
    <div :class="bem('header')">
      <h1 :class="bem('title', 'large')">{{ title }}</h1>
    </div>
    <div :class="bem('content', isActive && 'active')">
      <slot />
    </div>
  </div>
</template>

<script setup lang="ts">
import { paramCase } from 'vue-case';
import { ref } from 'vue';

const componentName = 'UserProfile';
const blockName = paramCase(componentName); // 'user-profile'

// BEM (Block Element Modifier) helper
const bem = (element: string, modifier?: string | boolean) => {
  const base = `${blockName}__${paramCase(element)}`;
  if (modifier && typeof modifier === 'string') {
    return `${base} ${base}--${paramCase(modifier)}`;
  }
  return base;
};

const title = ref('User Profile');
const isActive = ref(true);

// Generates classes like:
// user-profile__container
// user-profile__header
// user-profile__title user-profile__title--large
// user-profile__content user-profile__content--active
</script>

🔹 Example 7: Database Query Builder

import { snakeCase } from 'vue-case';

interface QueryFilters {
  [key: string]: any;
}

class QueryBuilder {
  private tableName: string;
  private filters: Record<string, any> = {};

  constructor(tableName: string) {
    this.tableName = snakeCase(tableName);
  }

  where(filters: QueryFilters) {
    this.filters = Object.entries(filters).reduce((acc, [key, value]) => {
      acc[snakeCase(key)] = value;
      return acc;
    }, {} as Record<string, any>);
    return this;
  }

  build(): string {
    const conditions = Object.entries(this.filters)
      .map(([key, value]) => `${key} = '${value}'`)
      .join(' AND ');
    
    return `SELECT * FROM ${this.tableName} WHERE ${conditions}`;
  }
}

// Usage
const query = new QueryBuilder('UserProfile')
  .where({
    firstName: 'John',
    emailAddress: 'john@example.com'
  })
  .build();

console.log(query);
// SELECT * FROM user_profile WHERE first_name = 'John' AND email_address = 'john@example.com'

🔹 Example 8: Internationalization Key Generator

import { dotCase } from 'vue-case';

interface TranslationKeys {
  [key: string]: string | TranslationKeys;
}

function generateI18nKeys(prefix: string, keys: string[]): TranslationKeys {
  return keys.reduce((acc, key) => {
    const i18nKey = dotCase(`${prefix} ${key}`);
    acc[i18nKey] = `${prefix}.${key}`;
    return acc;
  }, {} as TranslationKeys);
}

// Generate translation keys
const userKeys = generateI18nKeys('user', [
  'profile settings',
  'account details',
  'privacy settings'
]);

console.log(userKeys);
// {
//   'user.profile.settings': 'user.profile settings',
//   'user.account.details': 'user.account details',
//   'user.privacy.settings': 'user.privacy settings'
// }

// Use in Vue components
import { useI18n } from 'vue-i18n';

const { t } = useI18n();
const title = t(userKeys['user.profile.settings']);

🧪 Testing

Full support for all major testing frameworks:

import { describe, it, expect } from 'vitest'; // or jest
import { camelCase, pascalCase, snakeCase } from 'vue-case';

describe('vue-case transformations', () => {
  it('transforms to camelCase', () => {
    expect(camelCase('hello world')).toBe('helloWorld');
    expect(camelCase('hello-world')).toBe('helloWorld');
    expect(camelCase('hello_world')).toBe('helloWorld');
  });

  it('transforms to PascalCase', () => {
    expect(pascalCase('hello world')).toBe('HelloWorld');
  });

  it('handles edge cases', () => {
    expect(camelCase('')).toBe('');
    expect(camelCase('a')).toBe('a');
    expect(camelCase('hello@world')).toBe('helloWorld');
  });
});

📊 Performance

• ⚡ Minimal Bundle Size: ~22KB minified
• 🚀 Tree Shakeable: Import only what you need
• 🎯 Zero Dependencies: Built on lightweight text-case library
• 💨 Fast Execution: Optimized for performance
• 📦 Efficient: No runtime overhead

🌐 Browser Support

Latest ✅	Latest ✅	Latest ✅	Latest ✅

🔧 Advanced Configuration

Custom Plugin Options

import { createApp } from 'vue';
import VueCase from 'vue-case';
import type { VueCaseOptions } from 'vue-case';

const app = createApp(App);

// Custom options (currently all methods are included by default)
const options: VueCaseOptions = {
  // Future: Configure which methods to include
};

app.use(VueCase, options);

Method Chaining

import { camelCase, upperCaseFirst, lowerCase } from 'vue-case';

// Create custom transformations
const customTransform = (text: string) => {
  return upperCaseFirst(camelCase(lowerCase(text)));
};

customTransform('HELLO WORLD'); // 'HelloWorld'

📚 Type Definitions

// All available types exported
export type CaseTransformFn = (value: string) => string;
export type TruncateFn = (value: string, length?: number) => string;
export type CaseCheckFn = (value: string) => boolean;

export interface CaseMethods {
  camelCase: CaseTransformFn;
  pascalCase: CaseTransformFn;
  capitalCase: CaseTransformFn;
  headerCase: CaseTransformFn;
  titleCase: CaseTransformFn;
  pathCase: CaseTransformFn;
  paramCase: CaseTransformFn;
  dotCase: CaseTransformFn;
  snakeCase: CaseTransformFn;
  constantCase: CaseTransformFn;
  lowerCase: CaseTransformFn;
  lowerCaseFirst: CaseTransformFn;
  upperCase: CaseTransformFn;
  upperCaseFirst: CaseTransformFn;
  swapCase: CaseTransformFn;
  sentenceCase: CaseTransformFn;
  noCase: CaseTransformFn;
  isLowerCase: CaseCheckFn;
  isUpperCase: CaseCheckFn;
  truncate: TruncateFn;
}

export interface VueCaseOptions {
  // Plugin configuration options
}

// Global property types for Options API
declare module 'vue' {
  interface ComponentCustomProperties {
    $case: CaseMethods;
    $camelCase: CaseTransformFn;
    $pascalCase: CaseTransformFn;
    // ... all other methods
  }
}

❓ FAQ

Q: Can I use this with Vue 2?

A: No, version 2.0+ is for Vue 3 only. For Vue 2, use version 1.x:

npm install vue-case@1

Q: Does this work with Nuxt 3?

A: Yes! Just install and use it like any other Vue 3 plugin:

// plugins/vue-case.ts
import VueCase from 'vue-case';

export default defineNuxtPlugin((nuxtApp) => {
  nuxtApp.vueApp.use(VueCase);
});

Q: Can I use this without Vue?

A: Yes! Use direct imports:

import { camelCase, snakeCase } from 'vue-case';
// Works in any JavaScript/TypeScript project

Q: Is this tree-shakeable?

A: Yes! When you use direct imports, only the methods you import will be included in your bundle.

Q: What's the difference between paramCase and kebab-case?

A: They're the same! paramCase produces kebab-case format (hello-world).

🤝 Contributing

We welcome contributions! Here's how you can help:

1. 🍴 Fork the repository
2. 🔧 Create your feature branch (git checkout -b feature/AmazingFeature)
3. ✅ Test your changes (pnpm test)
4. 💾 Commit your changes (git commit -m 'Add some AmazingFeature')
5. 📤 Push to the branch (git push origin feature/AmazingFeature)
6. 🎉 Open a Pull Request

Development Setup

# Clone the repository
git clone https://github.com/idimetrix/vue-case.git
cd vue-case

# Install dependencies
pnpm install

# Run tests
pnpm test

# Run tests with coverage
pnpm test --coverage

# Build library
pnpm run build

# Type check
pnpm run typecheck

# Run dev server
pnpm serve

📝 Changelog

See CHANGELOG.md for detailed release notes.

📄 License

MIT © Dmitry Selikhov

🔗 Links

📦 Package npm

💻 Repository GitHub

🐛 Issues Report Bug

💡 Discussions Ideas & Questions

💝 Support the Project

If you find vue-case helpful, please consider:

• ⭐ Star the repository on GitHub
• 🐛 Report any bugs you find
• 📝 Contribute to documentation
• 💡 Suggest new features
• 📢 Share with the community
• 💖 Sponsor the development

🏆 Credits

Built with ❤️ using:

• Vue 3 - The Progressive JavaScript Framework
• TypeScript - JavaScript with syntax for types
• text-case - Text transformation utilities

📊 Stats

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Made with ❤️ for the Vue.js community

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