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# mime-db
[![NPM Version][npm-version-image]][npm-url]
[![NPM Downloads][npm-downloads-image]][npm-url]
[![Node.js Version][node-image]][node-url]
[![Build Status][travis-image]][travis-url]
[![Coverage Status][coveralls-image]][coveralls-url]
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
- http://hg.nginx.org/nginx/raw-file/default/conf/mime.types
## Installation
```bash
npm install mime-db
```
### Database Download
If you're crazy enough to use this in the browser, you can just grab the
JSON file using [RawGit](https://rawgit.com/). It is recommended to replace
`master` with [a release tag](https://github.com/jshttp/mime-db/tags) as the
JSON format may change in the future.
```
https://cdn.rawgit.com/jshttp/mime-db/master/db.json
```
## Usage
```js
var db = require('mime-db');
// grab data on .js files
var data = db['application/javascript'];
```
## Data Structure
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](http://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types)
- `iana` - [IANA-defined media types](http://www.iana.org/assignments/media-types/media-types.xhtml)
- `nginx` - [nginx media types](http://hg.nginx.org/nginx/raw-file/default/conf/mime.types)
- `.extensions[]` - known extensions associated with this mime type.
- `.compressible` - whether a file of this type can be gzipped.
- `.charset` - the default charset associated with this type, if any.
If unknown, every property could be `undefined`.
## Contributing
To edit the database, only make PRs against `src/custom.json` or
`src/custom-suffix.json`.
The `src/custom.json` file is a JSON object with the MIME type as the keys
and the values being an object with the following keys:
- `compressible` - leave out if you don't know, otherwise `true`/`false` to
indicate whether the data represented by the type is typically compressible.
- `extensions` - include an array of file extensions that are associated with
the type.
- `notes` - human-readable notes about the type, typically what the type is.
- `sources` - include an array of URLs of where the MIME type and the associated
extensions are sourced from. This needs to be a [primary source](https://en.wikipedia.org/wiki/Primary_source);
links to type aggregating sites and Wikipedia are _not acceptable_.
To update the build, run `npm run build`.
## Adding Custom Media Types
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](http://tools.ietf.org/html/rfc6838#section-5). Types
registered with the IANA are automatically pulled into this library.
[npm-version-image]: https://img.shields.io/npm/v/mime-db.svg
[npm-downloads-image]: https://img.shields.io/npm/dm/mime-db.svg
[npm-url]: https://npmjs.org/package/mime-db
[travis-image]: https://img.shields.io/travis/jshttp/mime-db/master.svg
[travis-url]: https://travis-ci.org/jshttp/mime-db
[coveralls-image]: https://img.shields.io/coveralls/jshttp/mime-db/master.svg
[coveralls-url]: https://coveralls.io/r/jshttp/mime-db?branch=master
[node-image]: https://img.shields.io/node/v/mime-db.svg
[node-url]: https://nodejs.org/en/download/