# @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.
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.
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.
However, please specify that your inquiry is about `@polka/url` specifically.
## License
MIT © [Luke Edwards](https://lukeed.com)
[polka]: https://github.com/lukeed/polka