.js — JavaScript Source File

Brendan Eich / Ecma International · 1995

Developer

Brendan Eich / Ecma International

What is a .js file?

JavaScript is the programming language of the web, running in every modern browser and increasingly on servers via Node.js. JS files contain code that adds interactivity, dynamic content, and complex functionality to websites. From simple form validation to full-featured web applications, JavaScript powers the interactive web as we know it. It is consistently ranked as one of the most popular programming languages in the world.

Programs That Open .js Files

Platform	Program
Windows	VS Code	Free
	WebStorm	Paid
	Node.js (runtime)	Free
macOS	VS Code	Free
	WebStorm	Paid

Common Problems with .js Files

⚠️ Cannot open .js file

Install one of the recommended programs listed above. For a free option, try the first free program in the list.

⚠️ .js file is corrupted

Try re-downloading the file. If the file was transferred, ensure the transfer completed without errors.

Frequently Asked Questions

What program opens .js files?▼

.js files can be opened with several programs. VS Code is one of the most popular choices.

Is .js a safe file format?▼

Generally yes, .js files are safe to open with appropriate software.

Can I convert .js to another format?▼

Yes, there are many online and offline tools available to convert .js files. Check the conversion section above for specific methods.

Technical Details

JavaScript Source File files use the application/javascript MIME type and were first introduced in 1995 by Brendan Eich / Ecma International. The file can be identified by its signature: Plain text (no signature).

Did You Know?

JavaScript Source File was first released in 1995 by Brendan Eich / Ecma International

Security Information

.js files are generally safe to open. However, always ensure your software is up to date to protect against potential vulnerabilities.