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.

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

Browser compatibility

See also

• Other URL-related interfaces: URL, HTMLHyperlinkElementUtils.
• Google Developers: Easy URL manipulation with URLSearchParams