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The importScripts() method of the WorkerGlobalScope interface synchronously imports one or more scripts into the worker's scope.


self.importScripts('foo.js', 'bar.js', ...);


A comma-separated list of DOMString objects representing the scripts to be imported.

Return value



  • NetworkError is raised if the MIME type of one of the script is text/csv, image/*, video/*, or audio/*. It should always be text/javascript.


If you had some functionality written in a separate script called foo.js that you wanted to use inside worker.js, you could import it using the following line:


importScripts() and self.importScripts() are effectively equivalent — both represent importScripts() being called from inside the worker's inner scope.


Specification Status Comment
WHATWG HTML Living Standard
The definition of 'importScripts()' in that specification.
Living Standard No change from Web Workers.
Web Workers
The definition of 'importScripts()' in that specification.
Editor's Draft Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 4 3.5 (1.9.1) (Yes) 11.5 4
Feature Android Chrome for Android Firefox Mobile (Gecko) Firefox OS (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? 40 1.0 (1.9.1) 1.0.1 (Yes) (Yes) 5.1

See also


Document Tags and Contributors

 Contributors to this page: gezeta-id, teoli, sdgluck, Jeremie, kmaglione, chrisdavidmills, kscarfone
 Last updated by: gezeta-id,