ApplicationText-based

`application/javascript`

JavaScript

Reference for application/javascript, the MIME type for JavaScript source code served by web servers and CDNs.

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Expected extensions: .js, .mjs

HTTP Content-Type Header

HTTP Header

Content-Type: application/javascript; charset=utf-8

Associated File Extensions

.js.mjs

Quick Facts

MIME Type	application/javascript
Category	Application
Type	Text-based (human-readable)
Extensions	.js, .mjs

Common Usage

JavaScript files served over HTTP should use this MIME type. Browsers require correct MIME types for script execution due to strict MIME checking.

It is used for serving JS bundles from web servers, CDNs, and build tools like Webpack, Vite, and esbuild.

Code Examples

HTML

<!-- Link or embed with explicit type -->
<link rel="stylesheet" href="file.js" type="application/javascript">

<!-- Or for script/media elements -->
<script type="application/javascript" src="file.js"></script>

Node.js

// Express.js
app.get('/file', (req, res) => {
  res.type('application/javascript');
  res.send(data);
});

// Node.js http
res.writeHead(200, { 'Content-Type': 'application/javascript' });

nginx

# nginx.conf — add to types block or use default
types {
    application/javascript  js mjs;
}

# Or set for a specific location
location /api/ {
    default_type application/javascript;
}