@marklb/file-type
Advanced tools
Detect the file type of a Buffer/Uint8Array
The file type is detected by checking the magic number of the buffer.
This repository is a fork of sindresorhus/file-type with ES5 build. IE couldn't load the script and the projects using this package are not configured to transpile dependencies. Also started making a types file for typescript, but it isn't complete.
$ npm install file-type
const readChunk = require('read-chunk');
const fileType = require('file-type');
const buffer = readChunk.sync('unicorn.png', 0, fileType.minimumBytes);
fileType(buffer);
//=> {ext: 'png', mime: 'image/png'}
Or from a remote location:
const http = require('http');
const fileType = require('file-type');
const url = 'http://assets-cdn.github.com/images/spinners/octocat-spinner-32.gif';
http.get(url, response => {
response.on('readable', () => {
const chunk = response.read(fileType.minimumBytes);
response.destroy();
console.log(fileType(chunk));
//=> {ext: 'gif', mime: 'image/gif'}
});
});
const xhr = new XMLHttpRequest();
xhr.open('GET', 'unicorn.png');
xhr.responseType = 'arraybuffer';
xhr.onload = () => {
fileType(new Uint8Array(this.response));
//=> {ext: 'png', mime: 'image/png'}
};
xhr.send();
Returns an Object with:
ext - One of the supported file typesmime - The MIME typeOr null when no match.
Type: Buffer Uint8Array
It only needs the first .minimumBytes bytes. The exception is detection of docx, pptx, and xlsx which potentially requires reading the whole file.
Type: number
The minimum amount of bytes needed to detect a file type. Currently, it's 4100 bytes, but it can change, so don't hardcode it.
jpgpnggifwebpflifcr2tifbmpjxrpsdziptarrargzbz27zdmgmp4m4vmidmkvwebmmovaviwmvmpgmp2mp3m4aoggopusflacwavqcpamrpdfepubmobi - Mobipocketexeswfrtfwoffwoff2eotttfotficoflvpsxzsqlitenescrxxpicabdebarrpmZlzmsimxfmtswasmblendbpgdocxpptxxlsx3gpjp2 - JPEG 2000jpm - JPEG 2000jpx - JPEG 2000mj2 - Motion JPEG 2000aifodt - OpenDocument for word processingods - OpenDocument for spreadsheetsodp - OpenDocument for presentationsxmlheiccurktxape - Monkey's Audiowv - WavPackasf - Advanced Systems Formatwma - Windows Media Audiowmv - Windows Media Videodcm - DICOM Image Filempc - Musepack (SV7 & SV8)ics - iCalendarSVG isn't included as it requires the whole file to be read, but you can get it here.
Pull request welcome for additional commonly used file types.
MIT
FAQs
Detect the file type of a Buffer/Uint8Array
We found that @marklb/file-type demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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