file-type-mime

Utility to parse mime type from a file content.

Usage

Browser (react)

import { parse } from 'file-type-mime';

export default function fileUpload() {
  async function onChange(e) {
    const [file] = e.target.files;
    const buffer = await file.arrayBuffer();
    const result = parse(buffer);

    console.log('MIME_TYPE', result);
  }

  return (
    <form>
      <input type="file" onChange={onChange}>
    </form>
  );
}

Node.js

import { parse } from 'file-type-mime';
import { readFileSync } from 'node:fs';
import { resolve } from 'node:path';

const file = resolve('./path/to/file.pdf');
const buffer = readFileSync(file);
const result = parse(buffer);

console.log('MIME_TYPE', result);

API

Signature

function parse(buffer: ArrayBuffer, options: Options = {}): Result | undefined

Arguments

buffer

Type: ArrayBuffer

A buffer representing file data

options (optional)

Type: { extra?: boolean; hint?: { ext?: string; mime?: string } }

• hint - used to short-circuit general flow by filtering signatures list
• extra - used to parse additional file type formats (like json, txt)

Return

Type: { ext: string; mime: string } | undefined

Supported file types

(more to come...)

File extension	Content (mime) type
bmp	image/bmp
gif	image/gif
ico	image/x-icon
jpg	image/jpeg
heic	image/heic
png	image/png
tiff	image/tiff
pdf	application/pdf
rtf	application/rtf
epub	application/epub+zip
gz	application/gzip
jar	application/java-archive
zip	application/zip
bz2	application/x-bzip2
rar	application/x-rar-compressed
tar	application/x-tar
docx	application/vnd.openxmlformats-officedocument.wordprocessingml.document
pptx	application/vnd.openxmlformats-officedocument.presentationml.presentation
xlsx	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
opd	application/vnd.oasis.opendocument.presentation
ods	application/vnd.oasis.opendocument.spreadsheet
odt	application/vnd.oasis.opendocument.text
db	application/vnd.sqlite3
7z	application/x-7z-compressed
avi	video/x-msvideo
mp3	audio/mp3
mp4	video/mp4
oga	audio/ogg
ogg	audio/ogg
ogm	video/ogg
ogv	video/ogg
ogx	application/ogg
wav	audio/wav
woff	font/woff
woff2	font/woff2
deb	application/x-deb
flac	audio/x-flac
psd	image/vnd.adobe.photoshop
wasm	application/wasm
webp	image/webp
class	application/java-vm
exe	application/x-msdownload
json	application/json
txt	text/plain

License