image-type

image-type

Detect the image type of a Buffer/Uint8Array

See the file-type module for more file types.

Install

$ npm install --save image-type

$ bower install --save image-type

$ component install sindresorhus/image-type

Usage

Node.js

var readChunk = require('read-chunk'); // npm install read-chunk
var imageType = require('image-type');
var buffer = readChunk.sync('unicorn.png', 0, 12);

imageType(buffer);
//=> png

Browser

var xhr = new XMLHttpRequest();
xhr.open('GET', 'unicorn.png');
xhr.responseType = 'arraybuffer';

xhr.onload = function () {
	imageType(new Uint8Array(this.response));
	//=> png
};

xhr.send();

API

imageType(buffer)

Returns: png, jpg, gif, webp, tif, bmp, jxr, psd, false

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

buffer

Type: buffer (Node.js), uint8array

It only needs the first 12 bytes.

CLI

$ npm install --global image-type

$ image-type --help

Usage
  $ cat <filename> | image-type
  $ image-type <filename>

Example
  $ cat unicorn.png | image-type
  png

License

MIT © Sindre Sorhus