JS file icon

JS File Extension

JavaScript Format

What is JS file?

JS is a developer type of file. JS files store source code written in Javascript programming language. JS code can be embedded on websites and used to verify input data, manipulate browser windows, or generate image galleries. JavaScript is chiefly a front-end technology. Javascript code can be saved directly in HTML files, but such practice limits its portability. The more common solution is to use dedicated JS files that can be reused across many websites or projects.


Javascript code does not require a Java virtual machine to be executed. JavaScript is not related in any way to Java programming language. Javascript code is not protected from viewing by users. Many JS files are freely available to the public and can be used on websites for free. Code in JS files can be freely edited under the open-source license.

Programs which support JS file extension

The list that follows enumerates programs compatible with JS files, divided into 3 categories based on operating system on which they are available. Files with JS suffix can be copied to any mobile device or system platform, but it may not be possible to open them properly on target system.

Updated: 11/06/2022

How to open file with JS extension?

There can be multiple causes why you have problems with opening JS files on given system. What is important, all common issues related to files with JS extension can be resolved by the users themselves. The process is quick and doesn’t involve an IT expert. The list below will guide you through the process of addressing the encountered problem.

Step 1. Get the Adobe Dreamweaver

Install software to open JS file The main and most frequent cause precluding users form opening JS files is that no program that can handle JS files is installed on user’s system. This one is an easy one. Select Adobe Dreamweaver or one of the recommended programs (for example, Text editor, Adobe ColdFusion, IntelliJ IDEA) and download it from appropriate source and install on your system. On the top of the page a list that contains all programs grouped based on operating systems supported can be found. If you want to download Adobe Dreamweaver installer in the most secured manner, we suggest you visit Adobe Systems Incorporated website and download from their official repositories.

Step 2. Check the version of Adobe Dreamweaver and update if needed

Update software that support file extension JSYou still cannot access JS files although Adobe Dreamweaver is installed on your system? Make sure that the software is up to date. It may also happen that software creators by updating their applications add compatibility with other, newer file formats. This can be one of the causes why JS files are not compatible with Adobe Dreamweaver. The latest version of Adobe Dreamweaver should support all file formats that where compatible with older versions of the software.

Step 3. Assign Adobe Dreamweaver to JS files

If the issue has not been solved in the previous step, you should associate JS files with latest version of Adobe Dreamweaver you have installed on your device. The next step should pose no problems. The procedure is straightforward and largely system-independent

Associate software with JS file on Windows

Selecting the first-choice application in Windows

  • Choose the Open with entry from the file menu accessed by right-mouse clicking on the JS file
  • Select Choose another app → More apps
  • Finally select Look for another app on this PC, point to the folder where Adobe Dreamweaver is installed, check the Always use this app to open JS files box and conform your selection by clicking OK button
Associate software with JS file on Mac

Selecting the first-choice application in Mac OS

  • Right-click the JS file and select Information
  • Proceed to the Open with section. If its closed, click the title to access available options
  • From the list choose the appropriate program and confirm by clicking Change for all....
  • If you followed the previous steps a message should appear: This change will be applied to all files with JS extension. Next, click the Continue button to finalize the process.

Step 4. Verify that the JS is not faulty

You closely followed the steps listed in points 1-3, but the problem is still present? You should check whether the file is a proper JS file. Being unable to access the file can be related to various issues.

Check JS file for viruses
1. Verify that the JS in question is not infected with a computer virus

Should it happed that the JS is infected with a virus, this may be that cause that prevents you from accessing it. Immediately scan the file using an antivirus tool or scan the whole system to ensure the whole system is safe. If the JS file is indeed infected follow the instructions below.

2. Ensure the file with JS extension is complete and error-free

If you obtained the problematic JS file from a third party, ask them to supply you with another copy. The file might have been copied erroneously and the data lost integrity, which precludes from accessing the file. It could happen the the download process of file with JS extension was interrupted and the file data is defective. Download the file again from the same source.

3. Ensure that you have appropriate access rights

Sometimes in order to access files user need to have administrative privileges. Switch to an account that has required privileges and try opening the JavaScript Format file again.

4. Make sure that the system has sufficient resources to run Adobe Dreamweaver

The operating systems may note enough free resources to run the application that support JS files. Close all running programs and try opening the JS file.

5. Check if you have the latest updates to the operating system and drivers

Latest versions of programs and drivers may help you solve problems with JavaScript Format files and ensure security of your device and operating system. Outdated drivers or software may have caused the inability to use a peripheral device needed to handle JS files.

Conversion of a JS file

File Conversions from JS extension to a different format
File conversions from other format to JS file
Do you want to help?

If you have additional information about the JS file, we will be grateful if you share it with our users. To do this, use the form here and send us your information on JS file.

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