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    3.0.0 • Public • Published


    A comprehensive, compact MIME type module.

    Build Status



    npm install mime


    It is recommended that you use a bundler such as webpack or browserify 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";
    // "lite" version
    <script type="module">
    import mime from "https://cdn.skypack.dev/mime/lite";

    Quick Start

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

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

    See 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:

    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 ...

    // 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.


    Get mime type for the given 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


    Get 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.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).

    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]


    > mime scripts/jquery.js

    Markdown generated from src/README_js.md by RunMD Logo



    npm i mime

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