is-png

Check if a Buffer/Uint8Array is a PNG image

Install

$ npm install is-png

Usage

Node.js

const readChunk = require('read-chunk'); // npm install read-chunk
const isPng = require('is-png');
const buffer = readChunk.sync('unicorn.png', 0, 8);

isPng(buffer);
//=> true

Browser

(async () => {
    const response = await fetch('unicorn.png');
    const buffer = await response.arrayBuffer();

    isPng(new Uint8Array(buffer));
    //=> true
})();

API

isPng(buffer)

Accepts a Buffer (Node.js) or Uint8Array. Returns a boolean of whether buffer is a PNG image.

buffer

The buffer to check. It only needs the first 8 bytes.

Related

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

License

MIT © Sindre Sorhus