```javascript --hide runmd.onRequire = path => path.replace(/mime/, '..');
# Mime
A comprehensive, compact MIME type module.
[](https://travis-ci.org/broofa/node-mime)
## Version 2 Notes
Version 2 is a breaking change from 1.x as the semver implies. Specifically:
* `lookup()` renamed to `getType()`
* `extension()` renamed to `getExtension()`
* `charset()` and `load()` methods have been removed
If you prefer the legacy version of this module please `npm install mime@^1`. Version 1 docs may be found [here](https://github.com/broofa/node-mime/tree/v1.4.0).
## Install
### NPMnpm install mime
### Browser
It is recommended that you use a bundler such as
[webpack](https://webpack.github.io/) or [browserify](http://browserify.org/) to
package your code. However, browser-ready versions are available via wzrd.in.
E.g. For the full version:
<script src="https://wzrd.in/standalone/mime@latest"></script>
<script>
mime.getType(...); // etc.
<script>
Or, for the `mime/lite` version:
<script src="https://wzrd.in/standalone/mime%2flite@latest"></script>
<script>
mimelite.getType(...); // (Note `mimelite` here)
<script>
## Quick Start
For the full version (800+ MIME types, 1,000+ extensions):
```javascript --run default
const mime = require('mime');
mime.getType('txt'); // RESULT
mime.getExtension('text/plain'); // RESULTSee Mime API below for API details.
Lite Version
There is also a "lite" version of this module that omits vendor-specific
(*/vnd.*) and experimental (*/x-*) types. It weighs in at ~2.5KB, compared
to 8KB for the full version. To load the lite version:
const mime = require('mime/lite');Mime .vs. mime-types .vs. mime-db modules
For those of you wondering about the difference between these [popular] NPM modules, here's a brief rundown ...
mime-db is "the source of
truth" for MIME type information. It is not an API. Rather, it is a canonical
dataset of mime type definitions pulled from IANA, Apache, NGINX, and custom mappings
submitted by the Node.js community.
mime-types is a thin
wrapper around mime-db that provides an API drop-in compatible(ish) with mime @ < v1.3.6 API.
mime is, as of v2, a self-contained module bundled with a pre-optimized version
of the mime-db dataset. It provides a simplified API with the following characteristics:
- Intelligently resolved type conflicts (See mime-score for details)
- Method naming consistent with industry best-practices
- Compact footprint. E.g. The minified+compressed sizes of the various modules:
| Module | Size |
|---|---|
mime-db |
18 KB |
mime-types |
same as mime-db |
mime |
8 KB |
mime/lite |
2 KB |
Mime API
Both require('mime') and require('mime/lite') return instances of the MIME
class, documented below.
Note: Inputs to this API are case-insensitive. Outputs (returned values) will be lowercase.
new Mime(typeMap, ... more maps)
Most users of this module will not need to create Mime instances directly. However if you would like to create custom mappings, you may do so as follows ...
```javascript --run default // Require Mime class const Mime = require('mime/Mime');
// Define mime type -> extensions map const typeMap = { 'text/abc': ['abc', 'alpha', 'bet'], 'text/def': ['leppard'] };
// Create and use Mime instance const myMime = new Mime(typeMap); myMime.getType('abc'); // RESULT myMime.getExtension('text/def'); // RESULT
If more than one map argument is provided, each map is `define()`ed (see below), in order.
### mime.getType(pathOrExtension)
Get mime type for the given path or extension. E.g.
```javascript --run default
mime.getType('js'); // RESULT
mime.getType('json'); // RESULT
mime.getType('txt'); // RESULT
mime.getType('dir/text.txt'); // RESULT
mime.getType('dir\\text.txt'); // RESULT
mime.getType('.text.txt'); // RESULT
mime.getType('.txt'); // RESULTnull is returned in cases where an extension is not detected or recognized
```javascript --run default mime.getType('foo/txt'); // RESULT mime.getType('bogus_type'); // RESULT
### mime.getExtension(type)
Get extension for the given mime type. Charset options (often included in
Content-Type headers) are ignored.
```javascript --run default
mime.getExtension('text/plain'); // RESULT
mime.getExtension('application/json'); // RESULT
mime.getExtension('text/html; charset=utf8'); // RESULTmime.define(typeMap[, force = false])
Define [more] type mappings.
typeMap is a map of type -> extensions, as documented in new Mime, above.
By default this method will throw an error if you try to map a type to an
extension that is already assigned to another type. Passing true for the
force argument will suppress this behavior (overriding any previous mapping).
```javascript --run default mime.define({'text/x-abc': ['abc', 'abcd']});
mime.getType('abcd'); // RESULT mime.getExtension('text/x-abc') // RESULT
## Command Line
mime [path_or_extension]
E.g.
> mime scripts/jquery.js
application/javascript