is-jpg

3.0.0 • Public • Published

is-jpg

Check if a Buffer/Uint8Array is a JPEG image

Install

npm install is-jpg

Usage

Node.js
import {readChunk} from 'read-chunk';
import isJpg from 'is-jpg';

const buffer = await readChunk('unicorn.jpg', {length: 3});

isJpg(buffer);
//=> true
Browser
const xhr = new XMLHttpRequest();
xhr.open('GET', 'unicorn.jpg');
xhr.responseType = 'arraybuffer';

xhr.onload = () => {
	isJpg(new Uint8Array(this.response));
	//=> true
};

xhr.send();

API

isJpg(buffer)

Accepts a Buffer (Node.js) or Uint8Array.

It only needs the first 3 bytes.

Related

  • file-type - Detect the file type of a Buffer/Uint8Array

Package Sidebar

Install

npm i is-jpg

Weekly Downloads

620,732

Version

3.0.0

License

MIT

Unpacked Size

2.82 kB

Total Files

4

Last publish

Collaborators

  • sindresorhus