image-type

Detect the image type of a Buffer/Uint8Array

image-type

Detect the image type of a Buffer/Uint8Array

See the file-type module for more file types.

$ npm install --save image-type
var readChunk = require('read-chunk'); // npm install read-chunk 
var imageType = require('image-type');
var buffer = readChunk.sync('unicorn.png', 0, 12);
 
imageType(buffer);
//=> {ext: 'png', mime: 'image/png'} 

or from a remote location:

var http = require('http');
var imageType = require('image-type');
var url = 'http://assets-cdn.github.com/images/spinners/octocat-spinner-32.gif';
 
http.get(url, function (res) {
    res.once('data', function (chunk) {
        res.destroy();
        console.log(imageType(chunk));
        //=> {ext: 'gif', mime: 'image/gif'} 
    });
});
var xhr = new XMLHttpRequest();
xhr.open('GET', 'unicorn.png');
xhr.responseType = 'arraybuffer';
 
xhr.onload = function () {
    imageType(new Uint8Array(this.response));
    //=> {ext: 'png', mime: 'image/png'} 
};
 
xhr.send();

Returns an object (or null when no match) with:

Type: buffer (Node.js), uint8array

It only needs the first 12 bytes.

$ npm install --global image-type
$ image-type --help
 
  Usage
    image-type <filename>
    cat <filename> | image-type
 
  Example
    cat unicorn.png | image-type
    png
  • jpg
  • png
  • gif
  • webp
  • tif
  • bmp
  • jxr
  • psd

SVG isn't included as it requires the whole file to be read, but you can get it here.

MIT © Sindre Sorhus