is-jxr

Check if a Buffer/Uint8Array is a JPEG XR image

Install

npm install is-jxr

Usage

Node.js

import {readChunk} from 'read-chunk';
import isJxr from 'is-jxr';

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

isJxr(buffer);
//=> true

Browser

const xhr = new XMLHttpRequest();
xhr.open('GET', 'unicorn.jxr');
xhr.responseType = 'arraybuffer';

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

xhr.send();

API

isJxr(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

cjser

This package is a CommonJS-compatible build generated by cjser for projects that still need require() support. The source version matches the original npm package version, with a cjser prerelease suffix for this generated build. Original repository: https://github.com/sindresorhus/is-jxr