A tiny (2.8kB) and fast utility for getting a MIME type from an extension or filename

## Features * Lightweight – 2.8kB gzip
_Only includes standard mime types; all experimental and vendor-specific mimetypes removed._ * [Performant](#benchmarks)
_All lookups are O(1) with minimal processing._ * Comprehensive Dictionary
_Generated from [`mime-db`](https://github.com/jshttp/mime-db), which aggregates the IANA, NGINX, and Apache datasets._ * Customizable
_Exposes the `mimes` dictionary for easy additions or overrides._ * Supports Native ESM and [Deno](https://deno.land/x/mrmime)
_Ships with CommonJS and ESM support!_ ## Install ``` $ npm install --save mrmime ``` ## Usage ```js import { lookup, mimes } from 'mrmime'; // Get a MIME type // --- lookup('txt'); //=> "text/plain" lookup('.txt'); //=> "text/plain" lookup('a.txt'); //=> "text/plain" // Unknown extension // --- lookup('.xyz'); //=> undefined // Add extension to dictionary // --- mimes['xyz'] = 'hello/world'; lookup('xyz'); //=> "hello/world" ``` ## API ### lookup(input) Returns: `string` or `undefined` #### input Type: `string` The extension or filename to lookup. > **Important:** > * Any `input` value is cast to string, lowercased, and trimmed. > * If a filename or filepath is provided, only the extension will be used. ## Benchmarks > Running on Node v16.8.0 ``` Load times: mrmime 0.963ms mime/lite 3.281ms mime 6.751ms Benchmark :: plain ("ext") mime x 598,849 ops/sec ±0.28% (94 runs sampled) mime/lite x 536,643 ops/sec ±0.11% (97 runs sampled) mrmime x 835,885 ops/sec ±0.20% (97 runs sampled) Benchmark :: leading (".ext") mime x 368,656 ops/sec ±0.19% (99 runs sampled) mime/lite x 368,318 ops/sec ±0.13% (97 runs sampled) mrmime x 533,643 ops/sec ±0.10% (96 runs sampled) Benchmark :: filename ("file.ext") mime x 326,907 ops/sec ±0.17% (95 runs sampled) mime/lite x 327,479 ops/sec ±0.12% (98 runs sampled) mrmime x 512,823 ops/sec ±0.12% (99 runs sampled) ``` ## Credits Of course, a thank-you to [`mime`](https://github.com/broofa/mime) serving the community all these years & for being a all-encompassing MIME type library. I've only ever needed lookup/`getType` functionality – and now ESM support – so `mrmime` can only ever support 1/3 of what `mime` offers, at best. This would not be possible without the team behind [`mime-db`](https://github.com/jshttp/mime-db), who have painstakingly maintained an amazing database for 7+ years. Artwork created by [mintinol](https://www.deviantart.com/mintinol), which I found [here](https://www.deviantart.com/mintinol/art/Mr-Mime-373927920). Finally, thanks to [Tim Branyen](https://github.com/tbranyen) for donating the package name :) ## License MIT © [Luke Edwards](https://lukeed.com)

c	File Name	Size	T	Date
-	index.d.ts	107	ts	2025-04-22 22:59:17
-	index.js	13516	js	2025-04-22 22:59:17
-	index.mjs	13494	mjs	2025-04-22 22:59:17
-	license	1122	%	2025-04-22 22:59:17
-	package.json	887	json	2025-04-22 22:59:17
-	readme.md	3579	md	2025-04-22 22:59:17

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