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export type Options = {
/**
@default 'http'
*/
readonly defaultProtocol?: 'https' | 'http';
/**
Prepends `defaultProtocol` to the URL if it's protocol-relative.
@default true
@example
```
normalizeUrl('//sindresorhus.com');
//=> 'http://sindresorhus.com'
normalizeUrl('//sindresorhus.com', {normalizeProtocol: false});
//=> '//sindresorhus.com'
```
*/
readonly normalizeProtocol?: boolean;
/**
Normalizes HTTPS URLs to HTTP.
@default false
@example
```
normalizeUrl('https://sindresorhus.com');
//=> 'https://sindresorhus.com'
normalizeUrl('https://sindresorhus.com', {forceHttp: true});
//=> 'http://sindresorhus.com'
```
*/
readonly forceHttp?: boolean;
/**
Normalizes HTTP URLs to HTTPS.
This option cannot be used with the `forceHttp` option at the same time.
@default false
@example
```
normalizeUrl('http://sindresorhus.com');
//=> 'http://sindresorhus.com'
normalizeUrl('http://sindresorhus.com', {forceHttps: true});
//=> 'https://sindresorhus.com'
```
*/
readonly forceHttps?: boolean;
/**
Strip the [authentication](https://en.wikipedia.org/wiki/Basic_access_authentication) part of a URL.
@default true
@example
```
normalizeUrl('https://user:password@sindresorhus.com');
//=> 'https://sindresorhus.com'
normalizeUrl('https://user:password@sindresorhus.com', {stripAuthentication: false});
//=> 'https://user:password@sindresorhus.com'
```
*/
readonly stripAuthentication?: boolean;
/**
Removes hash from the URL.
@default false
@example
```
normalizeUrl('sindresorhus.com/about.html#contact');
//=> 'http://sindresorhus.com/about.html#contact'
normalizeUrl('sindresorhus.com/about.html#contact', {stripHash: true});
//=> 'http://sindresorhus.com/about.html'
```
*/
readonly stripHash?: boolean;
/**
Remove the protocol from the URL: `http://sindresorhus.com` → `sindresorhus.com`.
It will only remove `https://` and `http://` protocols.
@default false
@example
```
normalizeUrl('https://sindresorhus.com');
//=> 'https://sindresorhus.com'
normalizeUrl('sindresorhus.com', {stripProtocol: true});
//=> 'sindresorhus.com'
```
*/
readonly stripProtocol?: boolean;
/**
Strip the [text fragment](https://web.dev/text-fragments/) part of the URL
__Note:__ The text fragment will always be removed if the `stripHash` option is set to `true`, as the hash contains the text fragment.
@default true
@example
```
normalizeUrl('http://sindresorhus.com/about.html#:~:text=hello');
//=> 'http://sindresorhus.com/about.html#'
normalizeUrl('http://sindresorhus.com/about.html#section:~:text=hello');
//=> 'http://sindresorhus.com/about.html#section'
normalizeUrl('http://sindresorhus.com/about.html#:~:text=hello', {stripTextFragment: false});
//=> 'http://sindresorhus.com/about.html#:~:text=hello'
normalizeUrl('http://sindresorhus.com/about.html#section:~:text=hello', {stripTextFragment: false});
//=> 'http://sindresorhus.com/about.html#section:~:text=hello'
```
*/
readonly stripTextFragment?: boolean;
/**
Removes `www.` from the URL.
@default true
@example
```
normalizeUrl('http://www.sindresorhus.com');
//=> 'http://sindresorhus.com'
normalizeUrl('http://www.sindresorhus.com', {stripWWW: false});
//=> 'http://www.sindresorhus.com'
```
*/
readonly stripWWW?: boolean;
/**
Removes query parameters that matches any of the provided strings or regexes.
@default [/^utm_\w+/i]
@example
```
normalizeUrl('www.sindresorhus.com?foo=bar&ref=test_ref', {
removeQueryParameters: ['ref']
});
//=> 'http://sindresorhus.com/?foo=bar'
```
If a boolean is provided, `true` will remove all the query parameters.
```
normalizeUrl('www.sindresorhus.com?foo=bar', {
removeQueryParameters: true
});
//=> 'http://sindresorhus.com'
```
`false` will not remove any query parameter.
```
normalizeUrl('www.sindresorhus.com?foo=bar&utm_medium=test&ref=test_ref', {
removeQueryParameters: false
});
//=> 'http://www.sindresorhus.com/?foo=bar&ref=test_ref&utm_medium=test'
```
*/
readonly removeQueryParameters?: ReadonlyArray<RegExp | string> | boolean;
/**
Keeps only query parameters that matches any of the provided strings or regexes.
__Note__: It overrides the `removeQueryParameters` option.
@default undefined
@example
```
normalizeUrl('https://sindresorhus.com?foo=bar&ref=unicorn', {
keepQueryParameters: ['ref']
});
//=> 'https://sindresorhus.com/?ref=unicorn'
```
*/
readonly keepQueryParameters?: ReadonlyArray<RegExp | string>;
/**
Removes trailing slash.
__Note__: Trailing slash is always removed if the URL doesn't have a pathname unless the `removeSingleSlash` option is set to `false`.
@default true
@example
```
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'
```
*/
readonly removeTrailingSlash?: boolean;
/**
Remove a sole `/` pathname in the output. This option is independent of `removeTrailingSlash`.
@default true
@example
```
normalizeUrl('https://sindresorhus.com/');
//=> 'https://sindresorhus.com'
normalizeUrl('https://sindresorhus.com/', {removeSingleSlash: false});
//=> 'https://sindresorhus.com/'
```
*/
readonly removeSingleSlash?: boolean;
/**
Removes the default directory index file from path that matches any of the provided strings or regexes.
When `true`, the regex `/^index\.[a-z]+$/` is used.
@default false
@example
```
normalizeUrl('www.sindresorhus.com/foo/default.php', {
removeDirectoryIndex: [/^default\.[a-z]+$/]
});
//=> 'http://sindresorhus.com/foo'
```
*/
readonly removeDirectoryIndex?: boolean | ReadonlyArray<RegExp | string>;
/**
Removes an explicit port number from the URL.
Port 443 is always removed from HTTPS URLs and 80 is always removed from HTTP URLs regardless of this option.
@default false
@example
```
normalizeUrl('sindresorhus.com:123', {
removeExplicitPort: true
});
//=> 'http://sindresorhus.com'
```
*/
readonly removeExplicitPort?: boolean;
/**
Sorts the query parameters alphabetically by key.
@default true
@example
```
normalizeUrl('www.sindresorhus.com?b=two&a=one&c=three', {
sortQueryParameters: false
});
//=> 'http://sindresorhus.com/?b=two&a=one&c=three'
```
*/
readonly sortQueryParameters?: boolean;
};
/**
[Normalize](https://en.wikipedia.org/wiki/URL_normalization) a URL.
URLs with custom protocols are not normalized and just passed through by default. Supported protocols are: `https`, `http`, `file`, and `data`.
Human-friendly URLs with basic auth (for example, `user:password@sindresorhus.com`) are not handled because basic auth conflicts with custom protocols. [Basic auth URLs are also deprecated.](https://developer.mozilla.org/en-US/docs/Web/HTTP/Authentication#access_using_credentials_in_the_url)
@param url - URL to normalize, including [data URL](https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs).
@example
```
import normalizeUrl from 'normalize-url';
normalizeUrl('sindresorhus.com');
//=> 'http://sindresorhus.com'
normalizeUrl('//www.sindresorhus.com:80/../baz?b=bar&a=foo');
//=> 'http://sindresorhus.com/baz?a=foo&b=bar'
```
*/
export default function normalizeUrl(url: string, options?: Options): string;

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// https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs
const DATA_URL_DEFAULT_MIME_TYPE = 'text/plain';
const DATA_URL_DEFAULT_CHARSET = 'us-ascii';
const testParameter = (name, filters) => filters.some(filter => filter instanceof RegExp ? filter.test(name) : filter === name);
const supportedProtocols = new Set([
'https:',
'http:',
'file:',
]);
const hasCustomProtocol = urlString => {
try {
const {protocol} = new URL(urlString);
return protocol.endsWith(':')
&& !protocol.includes('.')
&& !supportedProtocols.has(protocol);
} catch {
return false;
}
};
const normalizeDataURL = (urlString, {stripHash}) => {
const match = /^data:(?<type>[^,]*?),(?<data>[^#]*?)(?:#(?<hash>.*))?$/.exec(urlString);
if (!match) {
throw new Error(`Invalid URL: ${urlString}`);
}
let {type, data, hash} = match.groups;
const mediaType = type.split(';');
hash = stripHash ? '' : hash;
let isBase64 = false;
if (mediaType[mediaType.length - 1] === 'base64') {
mediaType.pop();
isBase64 = true;
}
// Lowercase MIME type
const mimeType = mediaType.shift()?.toLowerCase() ?? '';
const attributes = mediaType
.map(attribute => {
let [key, value = ''] = attribute.split('=').map(string => string.trim());
// Lowercase `charset`
if (key === 'charset') {
value = value.toLowerCase();
if (value === DATA_URL_DEFAULT_CHARSET) {
return '';
}
}
return `${key}${value ? `=${value}` : ''}`;
})
.filter(Boolean);
const normalizedMediaType = [
...attributes,
];
if (isBase64) {
normalizedMediaType.push('base64');
}
if (normalizedMediaType.length > 0 || (mimeType && mimeType !== DATA_URL_DEFAULT_MIME_TYPE)) {
normalizedMediaType.unshift(mimeType);
}
return `data:${normalizedMediaType.join(';')},${isBase64 ? data.trim() : data}${hash ? `#${hash}` : ''}`;
};
export default function normalizeUrl(urlString, options) {
options = {
defaultProtocol: 'http',
normalizeProtocol: true,
forceHttp: false,
forceHttps: false,
stripAuthentication: true,
stripHash: false,
stripTextFragment: true,
stripWWW: true,
removeQueryParameters: [/^utm_\w+/i],
removeTrailingSlash: true,
removeSingleSlash: true,
removeDirectoryIndex: false,
removeExplicitPort: false,
sortQueryParameters: true,
...options,
};
// Legacy: Append `:` to the protocol if missing.
if (typeof options.defaultProtocol === 'string' && !options.defaultProtocol.endsWith(':')) {
options.defaultProtocol = `${options.defaultProtocol}:`;
}
urlString = urlString.trim();
// Data URL
if (/^data:/i.test(urlString)) {
return normalizeDataURL(urlString, options);
}
if (hasCustomProtocol(urlString)) {
return urlString;
}
const hasRelativeProtocol = urlString.startsWith('//');
const isRelativeUrl = !hasRelativeProtocol && /^\.*\//.test(urlString);
// Prepend protocol
if (!isRelativeUrl) {
urlString = urlString.replace(/^(?!(?:\w+:)?\/\/)|^\/\//, options.defaultProtocol);
}
const urlObject = new URL(urlString);
if (options.forceHttp && options.forceHttps) {
throw new Error('The `forceHttp` and `forceHttps` options cannot be used together');
}
if (options.forceHttp && urlObject.protocol === 'https:') {
urlObject.protocol = 'http:';
}
if (options.forceHttps && urlObject.protocol === 'http:') {
urlObject.protocol = 'https:';
}
// Remove auth
if (options.stripAuthentication) {
urlObject.username = '';
urlObject.password = '';
}
// Remove hash
if (options.stripHash) {
urlObject.hash = '';
} else if (options.stripTextFragment) {
urlObject.hash = urlObject.hash.replace(/#?:~:text.*?$/i, '');
}
// Remove duplicate slashes if not preceded by a protocol
// NOTE: This could be implemented using a single negative lookbehind
// regex, but we avoid that to maintain compatibility with older js engines
// which do not have support for that feature.
if (urlObject.pathname) {
// TODO: Replace everything below with `urlObject.pathname = urlObject.pathname.replace(/(?<!\b[a-z][a-z\d+\-.]{1,50}:)\/{2,}/g, '/');` when Safari supports negative lookbehind.
// Split the string by occurrences of this protocol regex, and perform
// duplicate-slash replacement on the strings between those occurrences
// (if any).
const protocolRegex = /\b[a-z][a-z\d+\-.]{1,50}:\/\//g;
let lastIndex = 0;
let result = '';
for (;;) {
const match = protocolRegex.exec(urlObject.pathname);
if (!match) {
break;
}
const protocol = match[0];
const protocolAtIndex = match.index;
const intermediate = urlObject.pathname.slice(lastIndex, protocolAtIndex);
result += intermediate.replace(/\/{2,}/g, '/');
result += protocol;
lastIndex = protocolAtIndex + protocol.length;
}
const remnant = urlObject.pathname.slice(lastIndex, urlObject.pathname.length);
result += remnant.replace(/\/{2,}/g, '/');
urlObject.pathname = result;
}
// Decode URI octets
if (urlObject.pathname) {
try {
urlObject.pathname = decodeURI(urlObject.pathname);
} catch {}
}
// Remove directory index
if (options.removeDirectoryIndex === true) {
options.removeDirectoryIndex = [/^index\.[a-z]+$/];
}
if (Array.isArray(options.removeDirectoryIndex) && options.removeDirectoryIndex.length > 0) {
let pathComponents = urlObject.pathname.split('/');
const lastComponent = pathComponents[pathComponents.length - 1];
if (testParameter(lastComponent, options.removeDirectoryIndex)) {
pathComponents = pathComponents.slice(0, -1);
urlObject.pathname = pathComponents.slice(1).join('/') + '/';
}
}
if (urlObject.hostname) {
// Remove trailing dot
urlObject.hostname = urlObject.hostname.replace(/\.$/, '');
// Remove `www.`
if (options.stripWWW && /^www\.(?!www\.)[a-z\-\d]{1,63}\.[a-z.\-\d]{2,63}$/.test(urlObject.hostname)) {
// Each label should be max 63 at length (min: 1).
// Source: https://en.wikipedia.org/wiki/Hostname#Restrictions_on_valid_host_names
// Each TLD should be up to 63 characters long (min: 2).
// It is technically possible to have a single character TLD, but none currently exist.
urlObject.hostname = urlObject.hostname.replace(/^www\./, '');
}
}
// Remove query unwanted parameters
if (Array.isArray(options.removeQueryParameters)) {
// eslint-disable-next-line unicorn/no-useless-spread -- We are intentionally spreading to get a copy.
for (const key of [...urlObject.searchParams.keys()]) {
if (testParameter(key, options.removeQueryParameters)) {
urlObject.searchParams.delete(key);
}
}
}
if (!Array.isArray(options.keepQueryParameters) && options.removeQueryParameters === true) {
urlObject.search = '';
}
// Keep wanted query parameters
if (Array.isArray(options.keepQueryParameters) && options.keepQueryParameters.length > 0) {
// eslint-disable-next-line unicorn/no-useless-spread -- We are intentionally spreading to get a copy.
for (const key of [...urlObject.searchParams.keys()]) {
if (!testParameter(key, options.keepQueryParameters)) {
urlObject.searchParams.delete(key);
}
}
}
// Sort query parameters
if (options.sortQueryParameters) {
urlObject.searchParams.sort();
// Calling `.sort()` encodes the search parameters, so we need to decode them again.
try {
urlObject.search = decodeURIComponent(urlObject.search);
} catch {}
}
if (options.removeTrailingSlash) {
urlObject.pathname = urlObject.pathname.replace(/\/$/, '');
}
// Remove an explicit port number, excluding a default port number, if applicable
if (options.removeExplicitPort && urlObject.port) {
urlObject.port = '';
}
const oldUrlString = urlString;
// Take advantage of many of the Node `url` normalizations
urlString = urlObject.toString();
if (!options.removeSingleSlash && urlObject.pathname === '/' && !oldUrlString.endsWith('/') && urlObject.hash === '') {
urlString = urlString.replace(/\/$/, '');
}
// Remove ending `/` unless removeSingleSlash is false
if ((options.removeTrailingSlash || urlObject.pathname === '/') && urlObject.hash === '' && options.removeSingleSlash) {
urlString = urlString.replace(/\/$/, '');
}
// Restore relative protocol, if applicable
if (hasRelativeProtocol && !options.normalizeProtocol) {
urlString = urlString.replace(/^http:\/\//, '//');
}
// Remove http/https
if (options.stripProtocol) {
urlString = urlString.replace(/^(?:https?:)?\/\//, '');
}
return urlString;
}

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MIT License
Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (https://sindresorhus.com)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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{
"name": "normalize-url",
"version": "8.0.1",
"description": "Normalize a URL",
"license": "MIT",
"repository": "sindresorhus/normalize-url",
"funding": "https://github.com/sponsors/sindresorhus",
"author": {
"name": "Sindre Sorhus",
"email": "sindresorhus@gmail.com",
"url": "https://sindresorhus.com"
},
"type": "module",
"exports": {
"types": "./index.d.ts",
"default": "./index.js"
},
"sideEffects": false,
"engines": {
"node": ">=14.16"
},
"scripts": {
"//test": "xo && c8 ava && tsd",
"test": "c8 ava && tsd"
},
"files": [
"index.js",
"index.d.ts"
],
"keywords": [
"normalize",
"url",
"uri",
"address",
"string",
"normalization",
"normalisation",
"query",
"querystring",
"simplify",
"strip",
"trim",
"canonical"
],
"devDependencies": {
"ava": "^5.0.1",
"c8": "^7.12.0",
"tsd": "^0.24.1",
"xo": "^0.52.4"
},
"c8": {
"reporter": [
"text",
"lcov"
]
}
}

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# normalize-url [![Coverage Status](https://codecov.io/gh/sindresorhus/normalize-url/branch/main/graph/badge.svg)](https://codecov.io/gh/sindresorhus/normalize-url)
> [Normalize](https://en.wikipedia.org/wiki/URL_normalization) a URL
Useful when you need to display, store, deduplicate, sort, compare, etc, URLs.
**Note:** This package does **not** do URL sanitization. [Garbage in, garbage out.](https://en.wikipedia.org/wiki/Garbage_in,_garbage_out) If you use this in a server context and accept URLs as user input, it's up to you to protect against invalid URLs, [path traversal attacks](https://owasp.org/www-community/attacks/Path_Traversal), etc.
## Install
```sh
npm install normalize-url
```
## Usage
```js
import normalizeUrl from 'normalize-url';
normalizeUrl('sindresorhus.com');
//=> 'http://sindresorhus.com'
normalizeUrl('//www.sindresorhus.com:80/../baz?b=bar&a=foo');
//=> 'http://sindresorhus.com/baz?a=foo&b=bar'
```
## API
### normalizeUrl(url, options?)
URLs with custom protocols are not normalized and just passed through by default. Supported protocols are: `https`, `http`, `file`, and `data`.
Human-friendly URLs with basic auth (for example, `user:password@sindresorhus.com`) are not handled because basic auth conflicts with custom protocols. [Basic auth URLs are also deprecated.](https://developer.mozilla.org/en-US/docs/Web/HTTP/Authentication#access_using_credentials_in_the_url)
#### url
Type: `string`
URL to normalize, including [data URL](https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs).
#### options
Type: `object`
##### defaultProtocol
Type: `string`\
Default: `'http'`\
Values: `'https' | 'http'`
##### normalizeProtocol
Type: `boolean`\
Default: `true`
Prepend `defaultProtocol` to the URL if it's protocol-relative.
```js
normalizeUrl('//sindresorhus.com');
//=> 'http://sindresorhus.com'
normalizeUrl('//sindresorhus.com', {normalizeProtocol: false});
//=> '//sindresorhus.com'
```
##### forceHttp
Type: `boolean`\
Default: `false`
Normalize HTTPS to HTTP.
```js
normalizeUrl('https://sindresorhus.com');
//=> 'https://sindresorhus.com'
normalizeUrl('https://sindresorhus.com', {forceHttp: true});
//=> 'http://sindresorhus.com'
```
##### forceHttps
Type: `boolean`\
Default: `false`
Normalize HTTP to HTTPS.
```js
normalizeUrl('http://sindresorhus.com');
//=> 'http://sindresorhus.com'
normalizeUrl('http://sindresorhus.com', {forceHttps: true});
//=> 'https://sindresorhus.com'
```
This option cannot be used with the `forceHttp` option at the same time.
##### stripAuthentication
Type: `boolean`\
Default: `true`
Strip the [authentication](https://en.wikipedia.org/wiki/Basic_access_authentication) part of the URL.
```js
normalizeUrl('https://user:password@sindresorhus.com');
//=> 'https://sindresorhus.com'
normalizeUrl('https://user:password@sindresorhus.com', {stripAuthentication: false});
//=> 'https://user:password@sindresorhus.com'
```
##### stripHash
Type: `boolean`\
Default: `false`
Strip the hash part of the URL.
```js
normalizeUrl('sindresorhus.com/about.html#contact');
//=> 'http://sindresorhus.com/about.html#contact'
normalizeUrl('sindresorhus.com/about.html#contact', {stripHash: true});
//=> 'http://sindresorhus.com/about.html'
```
##### stripProtocol
Type: `boolean`\
Default: `false`
Remove the protocol from the URL: `http://sindresorhus.com` → `sindresorhus.com`.
It will only remove `https://` and `http://` protocols.
```js
normalizeUrl('https://sindresorhus.com');
//=> 'https://sindresorhus.com'
normalizeUrl('https://sindresorhus.com', {stripProtocol: true});
//=> 'sindresorhus.com'
```
##### stripTextFragment
Type: `boolean`\
Default: `true`
Strip the [text fragment](https://web.dev/text-fragments/) part of the URL.
**Note:** The text fragment will always be removed if the `stripHash` option is set to `true`, as the hash contains the text fragment.
```js
normalizeUrl('http://sindresorhus.com/about.html#:~:text=hello');
//=> 'http://sindresorhus.com/about.html#'
normalizeUrl('http://sindresorhus.com/about.html#section:~:text=hello');
//=> 'http://sindresorhus.com/about.html#section'
normalizeUrl('http://sindresorhus.com/about.html#:~:text=hello', {stripTextFragment: false});
//=> 'http://sindresorhus.com/about.html#:~:text=hello'
normalizeUrl('http://sindresorhus.com/about.html#section:~:text=hello', {stripTextFragment: false});
//=> 'http://sindresorhus.com/about.html#section:~:text=hello'
```
##### stripWWW
Type: `boolean`\
Default: `true`
Remove `www.` from the URL.
```js
normalizeUrl('http://www.sindresorhus.com');
//=> 'http://sindresorhus.com'
normalizeUrl('http://www.sindresorhus.com', {stripWWW: false});
//=> 'http://www.sindresorhus.com'
```
##### removeQueryParameters
Type: `Array<RegExp | string> | boolean`\
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'
```
If a boolean is provided, `true` will remove all the query parameters.
```js
normalizeUrl('www.sindresorhus.com?foo=bar', {
removeQueryParameters: true
});
//=> 'http://sindresorhus.com'
```
`false` will not remove any query parameter.
```js
normalizeUrl('www.sindresorhus.com?foo=bar&utm_medium=test&ref=test_ref', {
removeQueryParameters: false
});
//=> 'http://www.sindresorhus.com/?foo=bar&ref=test_ref&utm_medium=test'
```
##### keepQueryParameters
Type: `Array<RegExp | string>`\
Default: `undefined`
Keeps only query parameters that matches any of the provided strings or regexes.
**Note:** It overrides the `removeQueryParameters` option.
```js
normalizeUrl('https://sindresorhus.com?foo=bar&ref=unicorn', {
keepQueryParameters: ['ref']
});
//=> 'https://sindresorhus.com/?ref=unicorn'
```
##### removeTrailingSlash
Type: `boolean`\
Default: `true`
Remove trailing slash.
**Note:** Trailing slash is always removed if the URL doesn't have a pathname unless the `removeSingleSlash` option is set to `false`.
```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'
```
##### removeSingleSlash
Type: `boolean`\
Default: `true`
Remove a sole `/` pathname in the output. This option is independent of `removeTrailingSlash`.
```js
normalizeUrl('https://sindresorhus.com/');
//=> 'https://sindresorhus.com'
normalizeUrl('https://sindresorhus.com/', {removeSingleSlash: false});
//=> 'https://sindresorhus.com/'
```
##### removeDirectoryIndex
Type: `boolean | Array<RegExp | string>`\
Default: `false`
Removes 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'
```
##### removeExplicitPort
Type: `boolean`\
Default: `false`
Removes an explicit port number from the URL.
Port 443 is always removed from HTTPS URLs and 80 is always removed from HTTP URLs regardless of this option.
```js
normalizeUrl('sindresorhus.com:123', {
removeExplicitPort: true
});
//=> 'http://sindresorhus.com'
```
##### sortQueryParameters
Type: `boolean`\
Default: `true`
Sorts the query parameters alphabetically by key.
```js
normalizeUrl('www.sindresorhus.com?b=two&a=one&c=three', {
sortQueryParameters: false
});
//=> 'http://sindresorhus.com/?b=two&a=one&c=three'
```
## Related
- [compare-urls](https://github.com/sindresorhus/compare-urls) - Compare URLs by first normalizing them