This project is part of the @thi.ng/umbrella monorepo.

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• Installation
• Dependencies
• API
• Conversion from mime-db
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• License

650+ file extension to MIME type mappings, based on mime-db.

All MIME type mappings based on mime-db (2021-03-26). For filesize reasons only a small selected number of vendor MIME types (aka */vnd.*) are included. Most of the omitted ones are fairly obscure anyway, so likely not problematic...

STABLE - used in production

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• @thi.ng/dl-asset - Local asset download for web apps, with automatic MIME type detection

yarn add @thi.ng/mime

ES module import:

<script type="module" src="https://cdn.skypack.dev/@thi.ng/mime"></script>

Skypack documentation

For Node.js REPL:

# with flag only for < v16
node --experimental-repl-await

> const mime = await import("@thi.ng/mime");

Package sizes (gzipped, pre-treeshake): ESM: 4.94 KB

• @thi.ng/api

Generated API docs

This package exposes a MIME_TYPES object which provides mappings from file extensions to MIME types. For each extension one or more MIME types are provided, with the default type always in first position.

import { MIME_TYPES } from "@thi.ng/mime";

MIME_TYPES.mp3
// [ 'audio/mpeg', 'audio/mp3' ]

MIME_TYPES.jpg
// [ 'image/jpeg' ]

MIME_TYPES.jpeg
// [ 'image/jpeg' ]

To simplify lookup and support a fallback type, the package also has preferredType() function:

import { preferredType } from "@thi.ng/mime";

preferredType("mp3")
// "audio/mpeg"

// unknown file extension w/ default fallback type
preferredType("foo")
// "application/octet-stream"

// unknown file extension w/ given fallback type
preferredType("foo", "text/plain")
// "text/plain"

Since v0.3.0 reverse lookups are possible too, using preferredExtension() (also supports fallback):

preferredExtension("image/svg+xml");
// "svg"

preferredExtension("image/foo");
// "bin" (default fallback)

preferredExtension("image/foo", "dat");
// "dat" (custom fallback)

1. Download the latest version of mime-db's JSON index and save it to [packages/mime/]tools/mime-db.json
2. Run the following command to build an up-to-date index (assumes the umbrella repo has been pre-built already). Output will always be be written to src/generated.ts.

# from the thi.ng/umbrella repo root
cd packages/mime
yarn tool:convert

Additional configuration options are available in the tools/convert.ts script.

Karsten Schmidt

If this project contributes to an academic publication, please cite it as:

@misc{thing-mime,
  title = "@thi.ng/mime",
  author = "Karsten Schmidt",
  note = "https://thi.ng/mime",
  year = 2020
}

© 2020 - 2021 Karsten Schmidt // Apache Software License 2.0