URL()

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.

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 ''.

Exceptions

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

Browser compatibility

See also

• The interface it belongs to: URL.