File size: 5,124 Bytes
64fadb4 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 | <!--
-- This file is auto-generated from src/README_js.md. Changes should be made there.
-->
# Mime
A comprehensive, compact MIME type module.
[](https://travis-ci.org/broofa/mime)
## Install
### NPM
```
npm 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
skypack.dev as follows:
```
// Full version
<script type="module">
import mime from "https://cdn.skypack.dev/mime";
</script>
```
```
// "lite" version
<script type="module">
import mime from "https://cdn.skypack.dev/mime/lite";
</script>
```
## Quick Start
For the full version (800+ MIME types, 1,000+ extensions):
```javascript
const mime = require('mime');
mime.getType('txt'); // ⇨ 'text/plain'
mime.getExtension('text/plain'); // ⇨ 'txt'
```
See [Mime API](#mime-api) below for API details.
## Lite Version
The "lite" version of this module 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:
```javascript
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`](https://github.com/jshttp/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`](https://github.com/jshttp/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](https://github.com/broofa/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
// 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'); // ⇨ 'text/abc'
myMime.getExtension('text/def'); // ⇨ 'leppard'
```
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
mime.getType('js'); // ⇨ 'application/javascript'
mime.getType('json'); // ⇨ 'application/json'
mime.getType('txt'); // ⇨ 'text/plain'
mime.getType('dir/text.txt'); // ⇨ 'text/plain'
mime.getType('dir\\text.txt'); // ⇨ 'text/plain'
mime.getType('.text.txt'); // ⇨ 'text/plain'
mime.getType('.txt'); // ⇨ 'text/plain'
```
`null` is returned in cases where an extension is not detected or recognized
```javascript
mime.getType('foo/txt'); // ⇨ null
mime.getType('bogus_type'); // ⇨ null
```
### mime.getExtension(type)
Get extension for the given mime type. Charset options (often included in
Content-Type headers) are ignored.
```javascript
mime.getExtension('text/plain'); // ⇨ 'txt'
mime.getExtension('application/json'); // ⇨ 'json'
mime.getExtension('text/html; charset=utf8'); // ⇨ 'html'
```
### mime.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
mime.define({'text/x-abc': ['abc', 'abcd']});
mime.getType('abcd'); // ⇨ 'text/x-abc'
mime.getExtension('text/x-abc') // ⇨ 'abc'
```
## Command Line
mime [path_or_extension]
E.g.
> mime scripts/jquery.js
application/javascript
----
Markdown generated from [src/README_js.md](src/README_js.md) by [](https://github.com/broofa/runmd) |