is-jpg

snippet::is-jpg-buffer

Simple or drop-in replacement

This package is no longer necessary. You can check the first three bytes of a buffer against the JPEG file signature to detect if it is a JPEG image.

// example

function isJpg(buf) {
	if (!buf || buf.length < 3) return false;
	return (
		buf[0] === 0xff &&
		buf[1] === 0xd8 &&
		buf[2] === 0xff
	);
}