URLSearchParams: append() method
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2018.
Note: This feature is available in Web Workers.
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
js
append(name, value)
Parameters
Return value
None (undefined).
Examples
Adding the same parameter multiple times
js
const url = new URL("https://example.com?foo=1&bar=2");
const 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
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| URL # dom-urlsearchparams-append |
Browser compatibility
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