Package Exports
- is-jpg
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 (is-jpg) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.
Readme
is-jpg 
Check if a Buffer/Uint8Array is a JPEG image
Used by image-type.
Install
$ npm install --save is-jpg$ bower install --save is-jpg$ component install sindresorhus/is-jpgUsage
Node.js
var readChunk = require('read-chunk'); // npm install read-chunk
var isJpg = require('is-jpg');
var buffer = readChunk('unicorn.jpg', 0, 4);
isJpg(buffer);
//=> trueBrowser
var xhr = new XMLHttpRequest();
xhr.open('GET', 'unicorn.jpg');
xhr.responseType = 'arraybuffer';
xhr.onload = function () {
isJpg(new Uint8Array(this.response));
//=> true
};
xhr.send();API
isJpg(buffer)
Accepts a Buffer (Node.js) or Uint8Array.
It only needs the first 4 bytes.
License
MIT © Sindre Sorhus