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# normalize-url [](https://travis-ci.org/sindresorhus/normalize-url)
> [Normalize](http://en.wikipedia.org/wiki/URL_normalization) a URL
Useful when you need to display, store, deduplicate, sort, compare, etc, URLs.
## Install
```
$ npm install --save normalize-url
```
## Usage
```js
const normalizeUrl = require('normalize-url');
normalizeUrl('sindresorhus.com');
//=> 'http://sindresorhus.com'
normalizeUrl('HTTP://xn--xample-hva.com:80/?b=bar&a=foo');
//=> 'http://êxample.com/?a=foo&b=bar'
```
## API
### normalizeUrl(url, [options])
#### url
Type: `string`
URL to normalize.
#### options
##### normalizeProtocol
Type: `boolean`<br>
Default: `true`
Prepend `http:` to the URL if it's protocol-relative.
```js
normalizeUrl('//sindresorhus.com:80/');
//=> 'http://sindresorhus.com'
normalizeUrl('//sindresorhus.com:80/', {normalizeProtocol: false});
//=> '//sindresorhus.com'
```
##### normalizeHttps
Type: `boolean`<br>
Default: `false`
Normalize `https:` URLs to `http:`.
```js
normalizeUrl('https://sindresorhus.com:80/');
//=> 'https://sindresorhus.com'
normalizeUrl('https://sindresorhus.com:80/', {normalizeHttps: true});
//=> 'http://sindresorhus.com'
```
##### stripFragment
Type: `boolean`<br>
Default: `true`
Remove the fragment at the end of the URL.
```js
normalizeUrl('sindresorhus.com/about.html#contact');
//=> 'http://sindresorhus.com/about.html'
normalizeUrl('sindresorhus.com/about.html#contact', {stripFragment: false});
//=> 'http://sindresorhus.com/about.html#contact'
```
##### stripWWW
Type: `boolean`<br>
Default: `true`
Remove `www.` from the URL.
```js
normalizeUrl('http://www.sindresorhus.com/about.html#contact');
//=> 'http://sindresorhus.com/about.html#contact'
normalizeUrl('http://www.sindresorhus.com/about.html#contact', {stripWWW: false});
//=> 'http://www.sindresorhus.com/about.html#contact'
```
##### removeQueryParameters
Type: `Array<RegExp|string>`<br>
Default: `[/^utm_\w+/i]`
Remove query parameters that matches any of the provided strings or regexes.
```js
normalizeUrl('www.sindresorhus.com?foo=bar&ref=test_ref', {
removeQueryParameters: ['ref']
});
//=> 'http://sindresorhus.com/?foo=bar'
```
##### removeTrailingSlash
Type: `boolean`<br>
Default: `true`
Remove trailing slash.
**Note:** Trailing slash is always removed if the URL doesn't have a pathname.
```js
normalizeUrl('http://sindresorhus.com/redirect/');
//=> 'http://sindresorhus.com/redirect'
normalizeUrl('http://sindresorhus.com/redirect/', {removeTrailingSlash: false});
//=> 'http://sindresorhus.com/redirect/'
normalizeUrl('http://sindresorhus.com/', {removeTrailingSlash: false});
//=> 'http://sindresorhus.com'
```
##### removeDirectoryIndex
Type: `boolean` `Array<RegExp|string>`<br>
Default: `false`
Remove the default directory index file from path that matches any of the provided strings or regexes. When `true`, the regex `/^index\.[a-z]+$/` is used.
```js
normalizeUrl('www.sindresorhus.com/foo/default.php', {
removeDirectoryIndex: [/^default\.[a-z]+$/]
});
//=> 'http://sindresorhus.com/foo'
```
## Related
- [compare-urls](https://github.com/sindresorhus/compare-urls) - Compare URLs by first normalizing them
## License
MIT © [Sindre Sorhus](https://sindresorhus.com)
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