application/*
application/javascript
File extensions: .js, .mjs
JavaScript source served for execution in a browser or Node.
What is application/javascript?
application/javascript is the traditional media type for JavaScript. Modern specs prefer text/javascript, but application/javascript remains widely used and is accepted by every browser and runtime.
Typical usage
External <script src> files, JavaScript modules, Node.js source distributions.
Common gotchas
The HTML spec now recommends text/javascript as the canonical type. Both work — do not mix them within one <script> tag's charset assumptions.
HTTP header example
Response header
Content-Type: application/javascript; charset=utf-8Reference
RFC 4329 (obsoleted; see HTML Living Standard)
Frequently asked questions
What is the application/javascript MIME type?
application/javascript is the traditional media type for JavaScript. Modern specs prefer text/javascript, but application/javascript remains widely used and is accepted by every browser and runtime.
What file extension does application/javascript use?
Files served as application/javascript typically use the extensions .js, .mjs. The most common is .js.
How do I set the Content-Type for application/javascript?
Send the HTTP response header Content-Type: application/javascript; charset=utf-8. External <script src> files, JavaScript modules, Node.js source distributions.
Is application/javascript an official MIME type?
Yes. application/javascript is officially registered with IANA (RFC 4329 (obsoleted; see HTML Living Standard)), so standards-conformant clients recognize it.
What are common mistakes with application/javascript?
The HTML spec now recommends text/javascript as the canonical type. Both work — do not mix them within one <script> tag's charset assumptions.