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MIDI.js

As explained in Web Components in Action

MIDI.js is a JavaScript library that provides MIDI-related functionality and real-time musical tone generation in web applications.

MIDI.js provides real-time musical tone generation for browser applications, hiding much of the complexity of the Web Audio API. It can load an acoustic piano soundfont and play notes from interactive components. section 5.4

Playing a harp-string note

A string component converts its index to a MIDI note, uses strum power as velocity, starts the note, and schedules noteOff after 0.75 seconds. Playback is skipped until the plugin is ready.

How Web Components in Action covers it

How deep it goes
Demonstrates loading, readiness checks, volume, note timing, module wrapping, and autoplay handling without explaining audio internals.
Examples
Uses an acoustic-grand-piano soundfont, harp-string strumming, MIDI note calculations, and a click-to-start overlay.
What it assumes
Assumes JavaScript and Node.js familiarity while supplying a wrapper for libraries that lack modern module support.
What you can do after
Apply it via MIDI.js to load an instrument and trigger timed notes from browser interaction.
How it connects
Connects MIDI.js with Web Audio API, JavaScript modules, Node.js, Web Components, and browser autoplay behavior.
Cover of Web Components in Action
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Related concepts

This explainer was generated by Manning's knowledge graph from the text of Web Components in Action. The section links point to the parts of the book it draws on.