MidiParser is a Javascript Binary MIDI file reader for the browser and Node which converts a MIDI binary data structure to a JSON object, making it much easier to iterate over and interact with. Tiny and dependency free Browser & Node Compatible Supported data input BASE64 encoded Midi data UINT8 arrayBuffer, obtained when reading or fetching a .mid binary. FileInput Element in the Browser Custom Midi Messages Example A simple example parsing a MIDI file in Node ... let midiParser = require'midi-parser-js';let fs = require'fs' 'base64', function err,data { var midiArray = Example in Browser... import {MidiParser} from ' let source = source, functionobj{ }; If you want to see it in action, you can test it Here Syntax input [, callback] ; - input Accepts any of the supported Data Sources FileInputElement uint8Array base64String - callback Callback to be executed when data is parsed. Only required when input is a FileInputElement. Handle Custom messages sysEx, non-standard... By default, the library ignores the sysEx, and non-standard messages, simply converting their values to integers when possible. However you can provide a custom hook function to be executed when any non-standard message is found, and process it by your own, returning the resulting value. = function msgType, arrayBuffer, metaEventLength{ } - msgType Hex value of the message type - arrayBuffer Dataview of the midi data. You have to extract your value/s from it, moving the pointer as needed. - metaEventLength A length greater than 0 indicates a received message If you want the default action to be executed, return false Output JSON anatomy The returned JSON object contains all the attributes of the MIDI file format type, time division, track count... as properties. The tracks and the MIDI events related to each track are container inside the track property. The following JSON object represents a MIDI file with 3 tracks and 4 events in Track 0 outputObject{....formatType 012, ....timeDivision int, ....tracks int, ....track Array[........[0] Object{ ............event Array[ ................[0] Object{ ....................data string,....................deltaTime int,....................metaType int,....................type int................},................[1] Object{...}, ................[2] Object{...}, ................[3] Object{...} ............]........},........[1] Object{...}, ........[2] Object{...} ....]} If you want to read the data from Event 2 of Track 0 , you should use the following keypath Distribution & Installation The following distribution channels are available - NPM Install using the following command $ npm install midi-parser-js -s - GIT You can clone the repository $ git clone -ZIP Or download the package in a ZIP file from GITHUB LATEST PACKAGE RELEASE PAGE -CDN Include the latest release of this library in your HTML head using the CDN Warning Not recommended for production enviroments! Importing This package is shipped with support to Node CommonJS and ES6 Modules. Use the appropiate method accoordintg to your enviroment. import {MidiParser} from './ let MidiParser = require'midi-parser-js'; Bonus MIDI File Format Specifications MIDI Binary Encoding Specifications in