Package Exports
- image-type
This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (image-type) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.
Readme
image-type 
Detect the image type of a Buffer/Uint8Array
See the file-type module for more file types.
Install
$ npm install --save image-typeUsage
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);
//=> {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'}
});
});Browser
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();API
imageType(buffer)
Returns an object (or null when no match) with:
ext- one of the supported file typesmime- the MIME type
buffer
Type: buffer (Node.js), uint8array
It only needs the first 12 bytes.
CLI
$ npm install --global image-type$ image-type --help
Usage
image-type <filename>
cat <filename> | image-type
Example
cat unicorn.png | image-type
pngSupported file types
jpgpnggifwebptifbmpjxrpsd
SVG isn't included as it requires the whole file to be read, but you can get it here.
License
MIT © Sindre Sorhus