This is a database of all mime types. It consists of a single, public JSON file and does not include any logic, allowing it to remain as un-opinionated as possible with an API. It aggregates data from the following sources:

• http://www.iana.org/assignments/media-types/media-types.xhtml
• http://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types

npm install mime-db

If you're crazy enough to use this in the browser, you can just grab the JSON file:

https://cdn.rawgit.com/jshttp/mime-db/master/db.json

var db = require('mime-db');

// grab data on .js files
var data = db['application/javascript'];

The JSON file is a map lookup for lowercased mime types. Each mime type has the following properties:

• .source - where the mime type is defined. If not set, it's probably a custom media type.
  • apache - Apache common media types
  • iana - IANA-defined media types
• .extensions[] - known extensions associated with this mime type.
• .compressible - whether a file of this type is can be gzipped.
• .charset - the default charset associated with this type, if any.

If unknown, every property could be undefined.

• scripts - these are scripts to run to build the database
• src/ - this is a folder of files created from remote sources like Apache and IANA
• lib/ - this is a folder of our own custom sources and db, which will be merged into db.json
• db.json - the final built JSON file for end-user usage

To edit the database, only make PRs against files in the lib/ folder. To update the build, run npm run update.

The best way to get new media types included in this library is to register them with the IANA. The community registration procedure is outlined in RFC 6838 section 5. Types registered with the IANA are automatically pulled into this library.