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# @polka/url [![npm](https://badgen.now.sh/npm/v/@polka/url)](https://npmjs.org/package/@polka/url)

> Super fast, memoized `req.url` parser; _not_ limited to [Polka][polka]!

Parses the `url` from a [`IncomingMessage`](https://nodejs.org/api/http.html#http_class_http_incomingmessage) request. The returned object will always only contain the following keys: `search`, `query`, `pathname`, and `raw`.

> **Note:** This library does not process `protocol`, `hostname`, `port`, etc.<br>This is because the incoming `req.url` value only begins with the path information.

Parsed requests will be mutated with a `_parsedUrl` key, containing the returned output. This is used for future memoization, avoiding the need to fully parse the same `url` value multiple times.

## Install

```
$ npm install --save @polka/url
```

## Usage

```js
const parse = require('@polka/url');

let req = {
  url: '/foo/bar?fizz=buzz'
};
let output = parse(req);
//=> {
//=>   pathname: '/foo/bar',
//=>   raw: '/foo/bar?fizz=buzz',
//=>   search: '?fizz=buzz',
//=>   query: {
//=>     fizz: 'buzz'
//=>   },
//=> }

// Attaches result for future memoization
assert.deepEqual(output, req._parsedUrl); //=> true
```

## API

### url(req)
Returns: `Object` or `undefined`

> **Important:** The `req` must have a `url` key, otherwise `undefined` will be returned.<br>If no input is provided at all, a `TypeError` will be thrown.

#### req
Type: `IncomingMessage` or `{ url: string }`

The incoming HTTP request (`req`) or a plain `Object` with a `url` key.

> **Note:** In Node.js servers, the [`req.url`](https://nodejs.org/api/http.html#http_message_url) begins with a pathname & does not include a `hash`.


## Benchmarks

Check out the [`bench`](/bench) directory for in-depth benchmark results and comparisons.


## Support

Any issues or questions can be sent to the [Polka][polka] repository.<br>However, please specify that your inquiry is about `@polka/url` specifically.


## License

MIT © [Luke Edwards](https://lukeed.com)

[polka]: https://github.com/lukeed/polka