Text to Speech

@capacitor-community/text-to-speech

Capacitor community plugin for synthesizing speech from text.

Maintainers

Maintainer	GitHub	Social
Robin Genz	robingenz	@robin_genz

Installation

npm install @capacitor-community/text-to-speech
npx cap sync

Configuration

No configuration required for this plugin.

Demo

A working example can be found here: robingenz/capacitor-plugin-demo

Usage

import { TextToSpeech } from '@capacitor-community/text-to-speech';

const speak = async () => {
  await TextToSpeech.speak({
    text: 'This is a sample text.',
    lang: 'en-US',
    rate: 1.0,
    pitch: 1.0,
    volume: 1.0,
    category: 'ambient',
    queueStrategy: 1
  });
};

const stop = async () => {
  await TextToSpeech.stop();
};

const getSupportedLanguages = async () => {
  const languages = await TextToSpeech.getSupportedLanguages();
};

const getSupportedVoices = async () => {
  const voices = await TextToSpeech.getSupportedVoices();
};

const isLanguageSupported = async (lang: string) => {
  const isSupported = await TextToSpeech.isLanguageSupported({ lang });
};

API

• speak(...)
• stop()
• getSupportedLanguages()
• getSupportedVoices()
• isLanguageSupported(...)
• openInstall()
• addListener('onRangeStart', ...)
• Interfaces
• Enums

speak(...)

speak(options: TTSOptions) => Promise<void>

Starts the TTS engine and plays the desired text.

Param	Type
options	TTSOptions

---

stop()

stop() => Promise<void>

Stops the TTS engine.

---

getSupportedLanguages()

getSupportedLanguages() => Promise<{ languages: string[]; }>

Returns a list of supported BCP 47 language tags.

Returns: Promise<{ languages: string[]; }>

---

getSupportedVoices()

getSupportedVoices() => Promise<{ voices: SpeechSynthesisVoice[]; }>

Returns a list of supported voices.

Returns: Promise<{ voices: SpeechSynthesisVoice[]; }>

---

isLanguageSupported(...)

isLanguageSupported(options: { lang: string; }) => Promise<{ supported: boolean; }>

Checks if a specific BCP 47 language tag is supported.

Param	Type
options	{ lang: string; }

Returns: Promise<{ supported: boolean; }>

---

openInstall()

openInstall() => Promise<void>

Verifies proper installation and availability of resource files on the system.

Only available for Android.

---

addListener('onRangeStart', ...)

addListener(eventName: 'onRangeStart', listenerFunc: (info: { start: number; end: number; spokenWord: string; }) => void) => Promise<PluginListenerHandle>

Param	Type
eventName	'onRangeStart'
listenerFunc	(info: { start: number; end: number; spokenWord: string; }) => void

Returns: Promise<PluginListenerHandle>

---

Interfaces

TTSOptions

Prop	Type	Description	Default
text	string	The text that will be synthesised when the utterance is spoken.
lang	string	The language of the utterance. Possible languages can be queried using getSupportedLanguages.	"en-US"
rate	number	The speed at which the utterance will be spoken at.	1.0
pitch	number	The pitch at which the utterance will be spoken at.	1.0
volume	number	The volume that the utterance will be spoken at.	1.0
voice	number	The index of the selected voice that will be used to speak the utterance. Possible voices can be queried using getSupportedVoices.
category	string	Select the iOS Audio session category. Possible values: ambient and playback. Use playback to play audio even when the app is in the background. Only available for iOS.	"ambient"
queueStrategy	QueueStrategy	Select the strategy to adopt when several requests to speak overlap.	QueueStrategy.Flush

SpeechSynthesisVoice

The SpeechSynthesisVoice interface represents a voice that the system supports.

Prop	Type	Description
default	boolean	Specifies whether the voice is the default voice for the current app (true) or not (false).
lang	string	BCP 47 language tag indicating the language of the voice.
localService	boolean	Specifies whether the voice is supplied by a local (true) or remote (false) speech synthesizer service.
name	string	Human-readable name that represents the voice.
voiceURI	string	Type of URI and location of the speech synthesis service for this voice.

PluginListenerHandle

Prop	Type
remove	() => Promise<void>

Enums

QueueStrategy

Members	Value	Description
Flush	0	Use Flush to stop the current request when a new request is sent.
Add	1	Use Add to buffer the speech request. The request will be executed when all previous requests have been completed.

Changelog

See CHANGELOG.md.

License

See LICENSE.