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

    Install

    npm i is-jpg

    DownloadsWeekly Downloads

    739,124

    Version

    3.0.0

    License

    MIT

    Unpacked Size

    2.82 kB

    Total Files

    4

    Last publish

    Collaborators

    • sindresorhus