UI notification sounds via the Web Audio API.
No audio files. No dependencies. Pure TypeScript.

▶ Live demo

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Why earcon?

	earcon	Howler.js	Tone.js	ZzFX
No audio files	✅	❌	✅	✅
Notification-specific API	✅	❌	❌	❌
TypeScript native	✅	via @types	✅	❌
Zero dependencies	✅	✅	❌	✅
Bundle size	~3 KB	318 KB	5.4 MB	<1 KB
Semantic sound names	✅	❌	❌	❌
Customizable	✅	✅	✅	✅

An earcon is an auditory icon — a short, meaningful sound signal used in user interfaces. This library provides a curated set of them, generated entirely in code.

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Install

npm install earcons

CDN (no build step)

<!-- jsDelivr -->
<script src="https://cdn.jsdelivr.net/npm/earcons/dist/earcon.min.global.js"></script>

<!-- unpkg -->
<script src="https://unpkg.com/earcons/dist/earcon.min.global.js"></script>

All functions are available under the global Earcon object:

<button onclick="Earcon.playSuccess()">✅</button>
<button onclick="Earcon.playError()">❌</button>
<script>
  // or
  Earcon.earcon("notification", { volume: 0.8 });
</script>

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Quick start

import { playSuccess, playError, playWarning } from "earcons";

// Defaults — medium variant, volume 0.5
await playSuccess();
await playError();
await playWarning();

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API

Named play functions

Each function accepts an optional SoundOptions object.

import {
  playSuccess,
  playError,
  playWarning,
  playNotification,
  playClick,
  playInfo,
} from "earcons";

await playSuccess();
await playError({ variant: "long", volume: 0.8 });
await playWarning({ variant: "short" });
await playNotification({ pitch: 7 }); // +7 semitones
await playClick({ variant: "short" });
await playInfo({ volume: 0.3 });

Generic earcon() — play by name

import { earcon } from "earcons";

await earcon("success");
await earcon("error", { variant: "long" });

Built-in sound names: success · error · warning · notification · click · info

Register a custom sound

import { registerSound, earcon } from "earcons";
import type { SoundPreset } from "earcons";

const chirp: SoundPreset = (_variant, _pitch) => ({
  name: "chirp",
  duration: 0.15,
  notes: [
    { frequency: 1200, duration: 0.07, startAt: 0, waveShape: "sine" },
    { frequency: 1600, duration: 0.08, startAt: 0.07, waveShape: "sine" },
  ],
});

registerSound("chirp", chirp);
await earcon("chirp");

SoundOptions

Option	Type	Default	Description
volume	number	0.5	Master volume, 0–1
variant	"short" | "medium" | "long"	"medium"	Duration variant
pitch	number	0	Semitone offset (±)
audioContext	AudioContext	shared singleton	Bring your own context
onEnded	() => void	—	Called when the sound finishes

AudioContext management

import { closeAudioContext, setAudioContext } from "earcons";

// Provide your own AudioContext (useful in frameworks)
const myCtx = new AudioContext();
setAudioContext(myCtx);

// Tear down (e.g. on unmount)
await closeAudioContext();

---

Sound reference

UI sounds

Name	Waveform	Character
success	sine	Ascending major triad — bright, positive
error	sawtooth	Descending tritone — harsh, attention-grabbing
warning	triangle	Flat then descending minor second — cautious
notification	sine	Soft descending two-tone ding — neutral
click	sine	Very short transient — tactile UI feedback
info	sine	Single soft tone — informational, non-intrusive
toggle	triangle	Short tactile pop — on/off switch
delete	sawtooth	Rapid descending — destructive action
message	sine	Soft high ping — incoming chat message
plugIn	sine	Ascending sweep — inserted / connected
plugOut	sine	Descending sweep — removed / disconnected

Fun & misc

Name	Waveform	Character
eightBit	square	Chiptune arpeggio — retro 8-bit
police	sawtooth	Alternating wee-woo siren
coin	square	Classic pickup coin
boing	sine	Comedy spring drop

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Browser support

Any browser that supports the Web Audio API (all modern browsers since 2014).

Autoplay policy: earcon automatically calls AudioContext.resume() before playing. Make sure you call a play function in response to a user gesture on first load, or the browser may suppress audio.

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License

MIT