W3cubDocs

URL.constructor

The URL() constructor returns a newly created URL object representing the URL defined by the parameters.

If the given base URL or the resulting URL are not valid URLs, a DOMException of type SYNTAX_ERROR is thrown.

Note: This feature is available in Web Workers.

Syntax

url = new URL(url, [base])

Parameters

url: A USVString representing an absolute or relative URL. If url is a relative URL, base is required, and will be used as the base URL. If url is an absolute URL, a given base will be ignored.
base Optional: A USVString representing the base URL to use in case url is a relative URL. If not specified, it defaults to ''.

Note: You can still use an existing URL object for the base, which stringifies itself to the object's href attribute.

Exceptions

Exception	Explanation
`TypeError`	url (in the case of absolute URLs) or base + url (in the case of relative URLs) is not a valid URL.

Example

var a = new URL("/", "https://developer.mozilla.org"); // Creates a URL pointing to 'https://developer.mozilla.org/'
var b = new URL("https://developer.mozilla.org");      // Creates a URL pointing to 'https://developer.mozilla.org/'
var c = new URL('en-US/docs', b);                      // Creates a URL pointing to 'https://developer.mozilla.org/en-US/docs'
var d = new URL('/en-US/docs', b);                     // Creates a URL pointing to 'https://developer.mozilla.org/en-US/docs'
var f = new URL('/en-US/docs', d);                     // Creates a URL pointing to 'https://developer.mozilla.org/en-US/docs'
var g = new URL('/en-US/docs', "https://developer.mozilla.org/fr-FR/toto");
                                                       // Creates a URL pointing to 'https://developer.mozilla.org/en-US/docs'
var h = new URL('/en-US/docs', a);                     // Creates a URL pointing to 'https://developer.mozilla.org/en-US/docs'
var i = new URL('/en-US/docs', '');                    // Raises a TypeError exception as '' is not a valid URL
var j = new URL('/en-US/docs');                        // Raises a TypeError exception as '/en-US/docs' is not a valid URL
var k = new URL('http://www.example.com', 'https://developers.mozilla.com');
                                                       // Creates a URL pointing to 'http://www.example.com/'
var l = new URL('http://www.example.com', b);          // Creates a URL pointing to 'http://www.example.com/'

Specification

Specification	Status	Comment
URL The definition of 'URL.URL()' in that specification.	Living Standard	Initial definition.

Browser compatibilityUpdate compatibility data on GitHub

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	Yes	12	26	? — 11	Yes	Yes

	Mobile
	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support	Yes	Yes	12	26	Yes	Yes	?