is-midi

Check if a Buffer/Uint8Array is a MIDI file

Install

npm install is-midi

Usage

Node.js

import { readFileSync } from 'node:fs';
import isMidi from 'is-midi';

const buffer = readFileSync('song.mid');
isMidi(buffer);
//=> true

Browser

const response = await fetch('song.mid');
const buffer = new Uint8Array(await response.arrayBuffer());

isMidi(buffer);
//=> true

API

isMidi(buffer)

Returns true if the buffer is a MIDI file, false otherwise.

buffer

Type: Buffer | Uint8Array

The buffer to check. It only needs the first 4 bytes.

How it works

MIDI files start with the magic bytes MThd (hex: 4D 54 68 64). This package checks for those bytes to determine if a file is a MIDI file.

Related

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

License

MIT © Chris Vogt