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File Extension

JS File Format

JavaScript source code

JSP file format icon

JS is a file extension for a JavaScript source code file format.

JavaScript is used in Web development to do such things as:

  • Automatically change a formatted date
  • Cause a linked-to page to pop up in a new window
  • Cause text or an image to change during a mouse rollover

A JS file is used mainly to run client side JavaScript code on a webpage. The JS file contains all the HTML HEAD and BODY objects in the tags of an HTML page.

MIME type: application/x-javascript, text/javascript

 

Learn more about JS files:

Visit the Java website.

See the JavaScript learning guide at Search Domino.

Use IT Knowledge Exchange to find answers to your JavaScript questions.

This was last updated in July 2010
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