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@thi.ng/mime
Advanced tools
[!NOTE] This is one of 205 standalone projects, maintained as part of the @thi.ng/umbrella monorepo and anti-framework.
🚀 Please help me to work full-time on these projects by sponsoring me on GitHub. Thank you! ❤️
650+ file extension to MIME type mappings, based on mime-db.
All MIME type mappings are based on mime-db
(2023-02-17). 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...
Additionally, this package defines some MIME types not included in the original DB, as well as some preference overrides.
STABLE - used in production
Search or submit any issues for this package
yarn add @thi.ng/mime
ESM import:
import * as mime from "@thi.ng/mime";
Browser ESM import:
<script type="module" src="https://esm.run/@thi.ng/mime"></script>
For Node.js REPL:
const mime = await import("@thi.ng/mime");
Package sizes (brotli'd, pre-treeshake): ESM: 4.82 KB
None
Eight projects in this repo's /examples directory are using this package:
Screenshot | Description | Live demo | Source |
---|---|---|---|
![]() | Interactive image processing (adaptive threshold) | Demo | Source |
![]() | Interactive & reactive image blurhash generator | Demo | Source |
![]() | Color palette generation via dominant color extraction from uploaded images | Demo | Source |
![]() | Interactive pixel sorting tool using thi.ng/color & thi.ng/pixel | Demo | Source |
![]() | RGB waveform image analysis | Demo | Source |
![]() | Basic usage of the declarative rdom-forms generator | Demo | Source |
![]() | Multi-layer vectorization & dithering of bitmap images | Demo | Source |
![]() | rdom & WebGL-based image channel editor | Demo | Source |
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 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"
Reverse lookups are possible too, using preferredExtension()
(also supports fallback):
import { preferredExtension } from "@thi.ng/mime";
preferredExtension("image/svg+xml");
// "svg"
preferredExtension("image/foo");
// "bin" (default fallback)
preferredExtension("image/foo", "dat");
// "dat" (custom fallback)
The original mime-db includes information
if a MIME type is compressible (gzippable). This information can be obtained via
isCompressible()
. Note: Some of these decisions seem to be questionable/wrong
(e.g. many plain text formats are marked as false), but taken here as
provided...
import { isCompressible } from "@thi.ng/mime";
isCompressible("text/javascript");
// true
isCompressible(preferredType("mp4"))
// false
[packages/mime/]tools/mime-db.json
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.
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 - 2025 Karsten Schmidt // Apache License 2.0
FAQs
650+ file extension to MIME type mappings, based on mime-db
The npm package @thi.ng/mime receives a total of 2,629 weekly downloads. As such, @thi.ng/mime popularity was classified as popular.
We found that @thi.ng/mime demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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