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

URLSearchParams.append(name, value)

Parameters

name: The name of the parameter to append.
value: The value of the parameter to append.

Return value

Void.

Examples

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

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

Specifications

Specification
URL Standard (URL) # dom-urlsearchparams-append

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`append`	49	17	29	No	36	10.1	49	49	29	36	10.3	5.0