Mime

An API for MIME type information.

All mime-db types
Compact and dependency-free
Full TS support

[!Note] mime@4 is now latest. If you're upgrading from mime@3, note the following:

mime@4 is API-compatible with mime@3, with ~~one~~ two exceptions:

Direct imports of mime properties no longer supported

mime.define() cannot be called on the default mime object

ESM module support is required. ESM Module FAQ.

Requires an ES2020 or newer runtime

Built-in Typescript types (@types/mime no longer needed)

Installation

npm install mime

Quick Start

For the full version (800+ MIME types, 1,000+ extensions):

import mime from 'mime';

mime.getType('txt');                    // ⇨ 'text/plain'
mime.getExtension('text/plain');        // ⇨ 'txt'

Lite Version

mime/lite is a drop-in mime replacement, stripped of unofficial ("prs.*", "x-*", "vnd.*") types:

import mime from 'mime/lite';

API

`mime.getType(pathOrExtension)`

Get mime type for the given file path or extension. E.g.

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

mime.getType('foo/txt');        // ⇨ null
mime.getType('bogus_type');     // ⇨ null

`mime.getExtension(type)`

Get file extension for the given mime type. Charset options (often included in Content-Type headers) are ignored.

mime.getExtension('text/plain');               // ⇨ 'txt'
mime.getExtension('application/json');         // ⇨ 'json'
mime.getExtension('text/html; charset=utf8');  // ⇨ 'html'

`mime.getAllExtensions(type)`

[!Note] New in mime@4

Get all file extensions for the given mime type.

mime.getAllExtensions('image/jpeg'); // ⇨ Set(3) { 'jpeg', 'jpg', 'jpe' }

Custom `Mime` instances

The default mime objects are immutable. Custom, mutable versions can be created as follows...

new Mime(type map [, type map, ...])

Create a new, custom mime instance. For example, to create a mutable version of the default mime instance:

import { Mime } from 'mime/lite';

import standardTypes from 'mime/types/standard.js';
import otherTypes from 'mime/types/other.js';

const mime = new Mime(standardTypes, otherTypes);

Each argument is passed to the define() method, below. For example new Mime(standardTypes, otherTypes) is synonomous with new Mime().define(standardTypes).define(otherTypes)

`mime.define(type map [, force = false])`

[!Note] Only available on custom Mime instances

Define MIME type -> extensions.

Attempting to map a type to an already-defined extension will throw unless the force argument is set to true.

mime.define({'text/x-abc': ['abc', 'abcd']});

mime.getType('abcd');            // ⇨ 'text/x-abc'
mime.getExtension('text/x-abc')  // ⇨ 'abc'

Command Line

Extension -> type

$ mime scripts/jquery.js
application/javascript

Type -> extension

$ mime -r image/jpeg
jpeg

Current Tags

4.0.0-beta.1 ... beta (a year ago)
4.0.1 ... latest (a year ago)