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 and a CLI.
Install
$ npm install --save image-typeUsage
Node.js
const readChunk = require('read-chunk'); // npm install read-chunk
const imageType = require('image-type');
const buffer = readChunk.sync('unicorn.png', 0, 12);
imageType(buffer);
//=> {ext: 'png', mime: 'image/png'}Or from a remote location:
const http = require('http');
const imageType = require('image-type');
const url = 'http://assets-cdn.github.com/images/spinners/octocat-spinner-32.gif';
http.get(url, res => {
res.once('data', chunk => {
res.destroy();
console.log(imageType(chunk));
//=> {ext: 'gif', mime: 'image/gif'}
});
});Browser
const xhr = new XMLHttpRequest();
xhr.open('GET', 'unicorn.png');
xhr.responseType = 'arraybuffer';
xhr.onload = () => {
imageType(new Uint8Array(this.response));
//=> {ext: 'png', mime: 'image/png'}
};
xhr.send();API
imageType(input)
Returns an Object with:
ext- One of the supported file typesmime- The MIME type
Or null when no match.
input
Type: Buffer Uint8Array
It only needs the first 12 bytes.
Supported 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