Ghostery Url Parser

A Fast implementation of url parsing, mostly API-compatible with the standard URL class while being on average 2-3 times faster. Evaluation of URL components is lazy, so this implementation should be fast for all read use-cases.

Known differences to standard URL:

• Parameters returned via URL.searchParams.entries() are decoded only with decodeURIComponent. This differs to standards parsing in some subtle ways.
• You can iterate a URL parameters array directly via URL.searchParams.params. This is around 20% faster than using an iterator.
• Parameter strings (; sepearated key/value pairs) are parsed, and accessible via URL.parameters.
• Domain parsing with tldts is built in. The URL.domainInfo attribute returns output from tldts' parseHost method.
• Hostname validation is not done on initial parse. The isValidHost() method is provided for this purpose.
• All URLs with a valid authority are given an origin, regardless of the protocol scheme. This differs from the standard that only does so for a set of known schemes.

Install

npm install @ghostery/url-parser

Usage

const parsed = new URL('https://www.example.com');
parsed.hostname // == 'www.example.com'

Performance

We benchmark against a list of 250,000 URLs collected from popular sites, as previously used in our adblocker benchmark. We compare two use-cases:

1. URL object creation: new URL(url)
2. Query string parsing: new URL(url).searchParams.entries()

We compare to a reference implementation on each platform:

• Node: URL class from the url library
• Firefox: window.URL
• Chrome: window.URL
• Safari: window.URL

Environment	Use case	Reference: urls/s	Ghostery parser: urls/s	Speedup
Node 11	new URL()	149,514	1,577,711	10.5x faster
Node 11	searchParams	140,544	198,340	1.4x faster
Firefox 69	new URL()	268,066	1,043,877	3.9x faster
Firefox 69	searchParams	119,207	354,793	3.0x faster
Chrome 75	new URL()	366,294	1,721,903	4.7x faster
Chrome 75	searchParams	144,309	283,956	2.0x faster
Safari 12	new URL()	656,930	1,525,078	2.3x faster
Safari 12	searchParams	264,481	437,738	1.7x faster

All benchmarks were run on a Mid 2015 Macbook Pro, 2.5 GHz Intel Core i7, 16GB.

License

Mozilla Public License 2.0