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Code Quality Rank: L2
Monthly Downloads: 0
Programming language: JavaScript
License: MIT License
Tags: Miscellaneous     Image     Detect     File     Zip     Tar     Bz2     Archive     Check     Binary     Png     Gif     Ps     Mime     Buffer     Pdf     Jpg     Picture     Pic     Photo     Img     XML     Exif     Is     Psd     Jxr     Bmp     Tif     Webp     Uint8array     Type     Msi     Lz     Z     Rpm     Ar     Deb     Cab     Xpi     Sqlite     Xz     Flv     Ico     Otf     Ttf     Eot     Woff2     Woff     Rtf     Swf     Epub     Amr     Wav     Flac     Opus     Ogg     M4a     Mp3     Mpg     Avi     Mov     Webm     Mkv     Mid     M4v     Mp4     Dmg     7z     Gz     Rar     Cr2     Exe     Video     Flash     flif     Mxf     Xlsx     Wasm     Webassembly     Blend     Mts     Bpg     Ods     Docx     Pptx     3gp     Jp2     Jpm     Jpx     Mj2     Aif     Odt     Odp     Mobi     Heic     Mp2    
Latest version: v14.1.2

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README

file-type Build Status

Detect the file type of a Buffer/Uint8Array/ArrayBuffer

The file type is detected by checking the magic number of the buffer.

Install

$ npm install file-type

Usage

Node.js

Determine file type from a file:

const FileType = require('file-type');

(async () => {
    console.log(await FileType.fromFile('Unicorn.png'));
    //=> {ext: 'png', mime: 'image/png'}
})();

Determine file type from a Buffer, which may be a portion of the beginning of a file:

const FileType = require('file-type');
const readChunk = require('read-chunk');

(async () => {
    const buffer = readChunk.sync('Unicorn.png', 0, 4100);

    console.log(await FileType.fromBuffer(buffer));
    //=> {ext: 'png', mime: 'image/png'}
})();

Determine file type from a stream:

const fs = require('fs');
const FileType = require('file-type');

(async () => {
    const stream = fs.createReadStream('Unicorn.mp4');

    console.log(await FileType.fromStream(stream));
    //=> {ext: 'mp4', mime: 'image/mp4'}
}
)();

The stream method can also be used to read from a remote location:

const got = require('got');
const FileType = require('file-type');

const url = 'https://upload.wikimedia.org/wikipedia/en/a/a9/Example.jpg';

(async () => {
    const stream = got.stream(url);

    console.log(await FileType.fromStream(stream));
    //=> {ext: 'jpg', mime: 'image/jpeg'}
})();

Another stream example:

const stream = require('stream');
const fs = require('fs');
const crypto = require('crypto');
const FileType = require('file-type');

(async () => {
    const read = fs.createReadStream('encrypted.enc');
    const decipher = crypto.createDecipheriv(alg, key, iv);

    const fileTypeStream = await FileType.stream(stream.pipeline(read, decipher));

    console.log(fileTypeStream.fileType);
    //=> {ext: 'mov', mime: 'video/quicktime'}

    const write = fs.createWriteStream(`decrypted.${fileTypeStream.fileType.ext}`);
    fileTypeStream.pipe(write);
})();

Browser

const FileType = require('file-type/browser');

const url = 'https://upload.wikimedia.org/wikipedia/en/a/a9/Example.jpg';

(async () => {
    const response = await fetch(url);
    const fileType = await FileType.fromStream(response.body);

    console.log(fileType);
    //=> {ext: 'jpg', mime: 'image/jpeg'}
})();
const FileType = require('file-type/browser');

(async () => {
    const blob = new Blob(['<?xml version="1.0" encoding="ISO-8859-1" ?>'], {
        type: 'plain/text',
        endings: 'native'
    });

    console.log(await FileType.parseBlob(blob));
    //=> {ext: 'txt', mime: 'plain/text'}
})();

API

FileType.fromBuffer(buffer)

Detect the file type of a Buffer, Uint8Array, or ArrayBuffer.

The file type is detected by checking the magic number of the buffer.

If file access is available, it is recommended to use FileType.fromFile() instead.

Returns a Promise for an object with the detected file type and MIME type:

Or undefined when there is no match.

buffer

Type: Buffer | Uint8Array | ArrayBuffer

A buffer representing file data. It works best if the buffer contains the entire file, it may work with a smaller portion as well.

FileType.fromFile(filePath)

Detect the file type of a file path.

The file type is detected by checking the magic number of the buffer.

Returns a Promise for an object with the detected file type and MIME type:

Or undefined when there is no match.

filePath

Type: string

The file path to parse.

FileType.fromStream(stream)

Detect the file type of a Node.js readable stream.

The file type is detected by checking the magic number of the buffer.

Returns a Promise for an object with the detected file type and MIME type:

Or undefined when there is no match.

stream

Type: stream.Readable

A readable stream representing file data.

FileType.fromTokenizer(tokenizer)

Detect the file type from an ITokenizer source.

This method is used internally, but can also be used for a special "tokenizer" reader.

A tokenizer propagates the internal read functions, allowing alternative transport mechanisms, to access files, to be implemented and used.

Returns a Promise for an object with the detected file type and MIME type:

Or undefined when there is no match.

An example is @tokenizer/http, which requests data using HTTP-range-requests. A difference with a conventional stream and the tokenizer, is that it can ignore (seek, fast-forward) in the stream. For example, you may only need and read the first 6 bytes, and the last 128 bytes, which may be an advantage in case reading the entire file would take longer.

const {makeTokenizer} = require('@tokenizer/http');
const FileType = require('file-type');

const audioTrackUrl = 'https://test-audio.netlify.com/Various%20Artists%20-%202009%20-%20netBloc%20Vol%2024_%20tiuqottigeloot%20%5BMP3-V2%5D/01%20-%20Diablo%20Swing%20Orchestra%20-%20Heroines.mp3';

(async () => {
    const httpTokenizer = await makeTokenizer(audioTrackUrl);
    const fileType = await FileType.fromTokenizer(httpTokenizer);

    console.log(fileType);
    //=> {ext: 'mp3', mime: 'audio/mpeg'}
})();

Or use @tokenizer/s3 to determine the file type of a file stored on Amazon S3:

const FileType = require('file-type');
const S3 = require('aws-sdk/clients/s3');
const {makeTokenizer} = require('@tokenizer/s3');

(async () => {
    // Initialize the S3 client
    const s3 = new S3();

    // Initialize the S3 tokenizer.
    const s3Tokenizer = await makeTokenizer(s3, {
        Bucket: 'affectlab',
        Key: '1min_35sec.mp4'
    });

    // Figure out what kind of file it is.
    const fileType = await FileType.fromTokenizer(s3Tokenizer);
    console.log(fileType);
})();

Note that only the minimum amount of data required to determine the file type is read (okay, just a bit extra to prevent too many fragmented reads).

tokenizer

Type: ITokenizer

A file source implementing the tokenizer interface.

FileType.stream(readableStream)

Detect the file type of a readable stream.

Returns a Promise which resolves to the original readable stream argument, but with an added fileType property, which is an object like the one returned from FileType.fromFile().

Note: This method is only available using Node.js.

readableStream

Type: stream.Readable

The input stream.

FileType.extensions

Returns a set of supported file extensions.

FileType.mimeTypes

Returns a set of supported MIME types.

Supported file types

  • jpg
  • png
  • apng - Animated Portable Network Graphics
  • gif
  • webp
  • flif
  • cr2 - Canon Raw image file (v2)
  • cr3 - Canon Raw image file (v3)
  • orf - Olympus Raw image file
  • arw - Sony Alpha Raw image file
  • dng - Adobe Digital Negative image file
  • nef - Nikon Electronic Format image file
  • rw2 - Panasonic RAW image file
  • raf - Fujifilm RAW image file
  • tif
  • bmp
  • jxr
  • psd
  • zip
  • tar
  • rar
  • gz
  • bz2
  • 7z
  • dmg
  • mp4
  • mid
  • mkv
  • webm
  • mov
  • avi
  • mpg
  • mp1 - MPEG-1 Audio Layer I
  • mp2
  • mp3
  • ogg
  • ogv
  • ogm
  • oga
  • spx
  • ogx
  • opus
  • flac
  • wav
  • qcp
  • amr
  • pdf
  • epub
  • mobi - Mobipocket
  • exe
  • swf
  • rtf
  • woff
  • woff2
  • eot
  • ttf
  • otf
  • ico
  • flv
  • ps
  • xz
  • sqlite
  • nes
  • crx
  • xpi
  • cab
  • deb
  • ar
  • rpm
  • Z
  • lz
  • msi
  • mxf
  • mts
  • wasm
  • blend
  • bpg
  • docx
  • pptx
  • xlsx
  • jp2 - JPEG 2000
  • jpm - JPEG 2000
  • jpx - JPEG 2000
  • mj2 - Motion JPEG 2000
  • aif
  • odt - OpenDocument for word processing
  • ods - OpenDocument for spreadsheets
  • odp - OpenDocument for presentations
  • xml
  • heic
  • cur
  • ktx
  • ape - Monkey's Audio
  • wv - WavPack
  • asf - Advanced Systems Format
  • wma - Windows Media Audio
  • wmv - Windows Media Video
  • dcm - DICOM Image File
  • mpc - Musepack (SV7 & SV8)
  • ics - iCalendar
  • glb - GL Transmission Format
  • pcap - Libpcap File Format
  • dsf - Sony DSD Stream File (DSF)
  • lnk - Microsoft Windows file shortcut
  • alias - macOS Alias file
  • voc - Creative Voice File
  • ac3 - ATSC A/52 Audio File
  • 3gp - Multimedia container format defined by the Third Generation Partnership Project (3GPP) for 3G UMTS multimedia services
  • 3g2 - Multimedia container format defined by the 3GPP2 for 3G CDMA2000 multimedia services
  • m4v - MPEG-4 Visual bitstreams
  • m4p - MPEG-4 files with audio streams encrypted by FairPlay Digital Rights Management as were sold through the iTunes Store
  • m4a - Audio-only MPEG-4 files
  • m4b - Audiobook and podcast MPEG-4 files, which also contain metadata including chapter markers, images, and hyperlinks
  • f4v - ISO base media file format used by Adobe Flash Player
  • f4p - ISO base media file format protected by Adobe Access DRM used by Adobe Flash Player
  • f4a - Audio-only ISO base media file format used by Adobe Flash Player
  • f4b - Audiobook and podcast ISO base media file format used by Adobe Flash Player
  • mie - Dedicated meta information format which supports storage of binary as well as textual meta information
  • shp - Geospatial vector data format
  • arrow - Columnar format for tables of data
  • aac - Advanced Audio Coding
  • it - Audio module format: Impulse Tracker
  • s3m - Audio module format: ScreamTracker 3
  • xm - Audio module format: FastTracker 2
  • ai - Adobe Illustrator Artwork

Pull requests are welcome for additional commonly used file types.

The following file types will not be accepted:

  • .doc - Too old and difficult to parse.
  • .xls - Too old and difficult to parse.
  • .ppt - Too old and difficult to parse.
  • .csv - Reason.
  • .svg - Detecting it requires a full-blown parser. Check out is-svg for something that mostly works.

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