MDN’s new design is in Beta! A sneak peek:


This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.


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




A string.


let url = new URL('');
let params = new URLSearchParams(;

//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

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: chrisdavidmills, rolfedh, jpmedley
 Last updated by: chrisdavidmills,