.js — JavaScript Source File
Brendan Eich / Ecma International · 1995
JavaScript is the programming language of the web, running in every modern browser and increasingly on servers via Node.
Key Features
- Plain text storage behavior for typical code workflows
- Common MIME type: application/javascript
- Recognizable file signature: Plain text (no signature)
- Associated with Brendan Eich / Ecma International
Best For
- Developer workflows
- Version-controlled projects
- Readable plain-text editing
Less Ideal For
- Rich visual layouts
- Binary asset storage
- Non-technical end-user exchange
Common Use Cases
- Writing source code
- Configuring apps and tools
- Automating workflows or scripting
How to Open It
- On Windows, open the file with VS Code or WebStorm.
- On macOS, open the file with VS Code or WebStorm.
- If the file does not open, confirm that the extension really matches .js and that the download or transfer completed without corruption.
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
Frequently Asked Questions
.js files can be opened with several programs. VS Code is one of the most popular choices.
Generally yes, .js files are safe to open with appropriate software.
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).