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. If
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 compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Edge Opera Safari
Basic support (Yes) 26.0 (26.0) No support 12 (Yes) (Yes)
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support 4.4.4 26.0 (26.0) No support ? (Yes)

See also

  • The interface it belongs to: URL.

 

Document Tags and Contributors

 Last updated by: DevelX,