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 Status Comment
URL
The definition of 'append()' in that specification.
Living Standard Initial definition.

Browser compatibility

BCD tables only load in the browser

See also