Check if a Buffer/Uint8Array is a JPEG image
npm install is-jpgimport {readChunk} from 'read-chunk';
import isJpg from 'is-jpg';
const buffer = await readChunk('unicorn.jpg', {length: 3});
isJpg(buffer);
//=> trueconst xhr = new XMLHttpRequest();
xhr.open('GET', 'unicorn.jpg');
xhr.responseType = 'arraybuffer';
xhr.onload = () => {
isJpg(new Uint8Array(this.response));
//=> true
};
xhr.send();Accepts a Buffer (Node.js) or Uint8Array.
It only needs the first 3 bytes.
- file-type - Detect the file type of a Buffer/Uint8Array
