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MIME Type
text/javascript
Web AssetLegacy but still commonly seen MIME type for JavaScript files.
MIME type reference, HTTP example, browser usage, common mistakes, and related content.
What is the text/javascript MIME type?
The MIME type text/javascript is used to tell browsers, APIs, and servers how a file or response body should be interpreted.
MIME stands for Multipurpose Internet Mail Extensions, and MIME types are now a standard part of HTTP responses and web content delivery.
When a browser or client receives a response with text/javascript, it uses that information to decide how the content should be processed, rendered, downloaded, or executed.
Example
Content-Type: text/javascript
HTTP example
HTTP/1.1 200 OK Content-Type: text/javascript Content-Length: 1256
Common file extensions
.js
Common use cases
- Older web servers
- Legacy JavaScript delivery
- Browser script files
Common mistakes
- Using the wrong MIME type for the file being served
- Returning text/plain instead of text/javascript
- Forgetting required parameters like charset when relevant
- Using a deprecated MIME type in older server configurations
- Serving assets with a mismatched Content-Type header, causing browser parsing issues
How browsers use it
Browsers use the Content-Type response header to decide how a response should be handled. For example, HTML is rendered as a page, CSS is parsed as styles, JavaScript is executed as script, and images are displayed visually. If the MIME type is incorrect, the browser may refuse to load the file correctly or may treat it as plain text or a download instead.
Browser support
Broad browser support, especially for classic scripts, though application/javascript is usually the cleaner modern choice.
Developer note
Still widely used in practice, though application/javascript is often preferred in documentation.