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What is an appropriate content-type header for JavaScript files?

I am delivering a JS response from a PHP file. When setting the Content-Type header which value should I use, application/javascript or text/javascript?

What’s the difference between the two?

Solution

  • According to the IANA Registered MIME media type list, JS has two registered MIME types; the obsolete application/javascript and the now official text/javascript.

    Thus, use text/javascript.

    Note: This answer previously claimed the exact opposite (based on RFC 4329), but since RFC 9239 was published in May 2022 the text/javascript media type is preferred over application/javascript.