JS File

What are JS files and how to open them

Are you having problems opening a JS file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your JS files.

What is a JS file?

JS files have multiple uses, and Javascript Source Code is one of them. Read more about the other uses further down the page.

Javascript Source Code File

Files containing the .js extension are most commonly associated with JavaScript files. These JS files contain JavaScript code that is used to execute instructions in a Web page that uses client-side scripting.

The functions may include the validation of form fields, rollover images, drop-down menu creation and other functions.

The .js file extension is also used for JACOsub script files, JetScript output files, Netscape settings files and ECMAScript language files.

How to open JS files

We have identified three JS openers that are compatible with this specific type of JS file.

Programs that open Javascript Source Code files

Last updated: January 22, 2025

All known file formats using extension .JS

While Javascript Source Code File is a popular type of JS-file, we know of 2 different uses of the .JS file extension. Different software may use files with the same extension for different types of data.

Mozilla (Netscape) Settings

We know that one JS format is Mozilla (Netscape) Settings. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

While we have not verified the apps ourselves yet, our users have suggested ten different JS openers which you will find listed below.

Various apps that use files with this extension

These apps are known to open certain types of JS files. Remember, different programs may use JS files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about JS file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.