Category: Application

application/javascript

application/javascript is the official IANA standard MIME type for JavaScript source code (superseding text/javascript in RFC 4329, though both are accepted by modern browsers).

MIME / CONTENT-TYPE

ASSOCIATED EXTENSIONS

.js, .mjs

PRIMARY CATEGORY

Application

HTTP Headers & Web Server Configurations

Standard HTTP Response Header

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

Send this exact header in HTTP responses to instruct browsers how to decode and render the payload.

Node.js / Express / Web API

res.setHeader("Content-Type", "application/javascript; charset=utf-8");
res.setHeader("X-Content-Type-Options", "nosniff");

NGINX Configuration (mime.types)

types {
    application/javascript js mjs;
}

Apache (.htaccess / httpd.conf)

AddType application/javascript .js .mjs

Security Advisory & Hardening

Always enforce "X-Content-Type-Options: nosniff" to prevent browsers from executing non-JS files masquerading as scripts.

Frequently Asked Questions

application/javascript Questions & Answers

Common questions regarding MIME types, Content-Type headers, and web server configurations.

The standard HTTP response header is: "Content-Type: application/javascript; charset=utf-8".

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