This is an experimental technology
Check the Browser compatibility table carefully before using this in production.


The toString() method of the URLSearchParams interface returns a query string suitable for use in a URL.




A string.


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);
//Prints 'foo=1&bar=2&foo=4'.


Specification Status Comment
The definition of 'toString()' in that specification.
Living Standard Initial definition. Appears in the IDL as stringifier.

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 49.0 (Yes) No support (Yes) ?
Feature Android Android Webview Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support No support 49.0 (Yes) No support (Yes) ? 49.0

See also

Document Tags and Contributors

Contributors to this page: bassplayer7, chrisdavidmills, rolfedh, jpmedley
Last updated by: bassplayer7,