URLSearchParams.append()

The append() method of the URLSearchParams interface appends a specified key/value pair as a new search parameter.

As shown in the example below, if the same key is appended multiple times it will appear in the parameter string multiple times for each value.

Note: This feature is available in Web Workers

Syntax

append(name, value)

Parameters

name

The name of the parameter to append.

value

The value of the parameter to append.

Return value

None (undefined).

Examples

let url = new URL('https://example.com?foo=1&bar=2');
let params = new URLSearchParams(url.search);

//Add a second foo parameter.
params.append('foo', 4);
//Query string is now: 'foo=1&bar=2&foo=4'

Specifications

Specification
URL Standard
# dom-urlsearchparams-append

Browser compatibility

BCD tables only load in the browser

See also