Getting Started

Install

bun add @capgo/capacitor-speech-synthesis
bunx cap sync

Import

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

API Overview

speak

Speaks the given text with specified options. The utterance is added to the speech queue.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

const result = await SpeechSynthesis.speak({
  text: 'Hello, world!',
  language: 'en-US',
  rate: 1.0,
  pitch: 1.0,
  volume: 1.0,
  queueStrategy: 'Add'
});
console.log('Utterance ID:', result.utteranceId);

synthesizeToFile

Synthesizes speech to an audio file (Android/iOS only). Returns the file path where the audio was saved.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

const result = await SpeechSynthesis.synthesizeToFile({
  text: 'Hello, world!',
  language: 'en-US'
});
console.log('Audio file saved at:', result.filePath);

cancel

Cancels all queued utterances and stops current speech.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

await SpeechSynthesis.cancel();

pause

Pauses speech immediately.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

await SpeechSynthesis.pause();

resume

Resumes paused speech.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

await SpeechSynthesis.resume();

isSpeaking

Checks if speech synthesis is currently speaking.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

const { isSpeaking } = await SpeechSynthesis.isSpeaking();
console.log('Is speaking:', isSpeaking);

isAvailable

Checks if speech synthesis is available on the device.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

const { isAvailable } = await SpeechSynthesis.isAvailable();
if (isAvailable) {
  console.log('Speech synthesis is available');
}

getVoices

Gets all available voices.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

const { voices } = await SpeechSynthesis.getVoices();
voices.forEach(voice => {
  console.log(`${voice.name} (${voice.language})`);
});

getLanguages

Gets all available languages.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

const { languages } = await SpeechSynthesis.getLanguages();
console.log('Available languages:', languages);

isLanguageAvailable

Checks if a specific language is available.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

const { isAvailable } = await SpeechSynthesis.isLanguageAvailable({
  language: 'es-ES'
});
console.log('Spanish available:', isAvailable);

isVoiceAvailable

Checks if a specific voice is available.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

const { isAvailable } = await SpeechSynthesis.isVoiceAvailable({
  voiceId: 'com.apple.ttsbundle.Samantha-compact'
});
console.log('Voice available:', isAvailable);

initialize

Initializes the speech synthesis engine (iOS optimization). This can reduce latency for the first speech request.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

await SpeechSynthesis.initialize();

activateAudioSession

Activates the audio session with a specific category (iOS only).

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

await SpeechSynthesis.activateAudioSession({
  category: 'Playback'
});

deactivateAudioSession

Deactivates the audio session (iOS only).

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

await SpeechSynthesis.deactivateAudioSession();

Type Reference

SpeakOptions

Options for speaking text.

export interface SpeakOptions {
  /**
   * The text to speak.
   *
   * @since 1.0.0
   */
  text: string;

  /**
   * The BCP-47 language tag (e.g., 'en-US', 'es-ES').
   *
   * @since 1.0.0
   */
  language?: string;

  /**
   * The voice identifier to use.
   *
   * @since 1.0.0
   */
  voiceId?: string;

  /**
   * The pitch of the voice (0.5 to 2.0, default: 1.0).
   *
   * @since 1.0.0
   */
  pitch?: number;

  /**
   * The speaking rate (0.1 to 10.0, default: 1.0).
   *
   * @since 1.0.0
   */
  rate?: number;

  /**
   * The volume (0.0 to 1.0, default: 1.0).
   *
   * @since 1.0.0
   */
  volume?: number;

  /**
   * The queue strategy: 'Add' to append or 'Flush' to replace queue.
   * Default: 'Add'
   *
   * @since 1.0.0
   */
  queueStrategy?: 'Add' | 'Flush';
}

SpeakResult

Result from speaking text.

export interface SpeakResult {
  /**
   * Unique identifier for this utterance.
   *
   * @since 1.0.0
   */
  utteranceId: string;
}

SynthesizeToFileResult

Result from synthesizing to file.

export interface SynthesizeToFileResult {
  /**
   * The file path where audio was saved.
   *
   * @since 1.0.0
   */
  filePath: string;

  /**
   * Unique identifier for this utterance.
   *
   * @since 1.0.0
   */
  utteranceId: string;
}

VoiceInfo

Information about a voice.

export interface VoiceInfo {
  /**
   * Unique voice identifier.
   *
   * @since 1.0.0
   */
  id: string;

  /**
   * Display name of the voice.
   *
   * @since 1.0.0
   */
  name: string;

  /**
   * BCP-47 language code.
   *
   * @since 1.0.0
   */
  language: string;

  /**
   * Gender of the voice (iOS only).
   *
   * @since 1.0.0
   */
  gender?: 'male' | 'female' | 'neutral';

  /**
   * Whether this voice requires a network connection.
   *
   * @since 1.0.0
   */
  isNetworkConnectionRequired?: boolean;

  /**
   * Whether this is the default voice (Web only).
   *
   * @since 1.0.0
   */
  default?: boolean;
}

IsLanguageAvailableOptions

Options for checking language availability.

export interface IsLanguageAvailableOptions {
  /**
   * The BCP-47 language code to check.
   *
   * @since 1.0.0
   */
  language: string;
}

IsVoiceAvailableOptions

Options for checking voice availability.

export interface IsVoiceAvailableOptions {
  /**
   * The voice ID to check.
   *
   * @since 1.0.0
   */
  voiceId: string;
}

ActivateAudioSessionOptions

Options for activating the audio session (iOS only).

export interface ActivateAudioSessionOptions {
  /**
   * The audio session category.
   * - 'Ambient': Mixes with other audio
   * - 'Playback': Stops other audio
   *
   * @since 1.0.0
   */
  category: 'Ambient' | 'Playback';
}

UtteranceEvent

Event emitted when utterance starts or ends.

export interface UtteranceEvent {
  /**
   * The utterance identifier.
   *
   * @since 1.0.0
   */
  utteranceId: string;
}

BoundaryEvent

Event emitted at word boundaries.

export interface BoundaryEvent {
  /**
   * The utterance identifier.
   *
   * @since 1.0.0
   */
  utteranceId: string;

  /**
   * The character index in the text.
   *
   * @since 1.0.0
   */
  charIndex: number;

  /**
   * The character length of the current word.
   *
   * @since 1.0.0
   */
  charLength?: number;
}

ErrorEvent

Event emitted on synthesis error.

export interface ErrorEvent {
  /**
   * The utterance identifier.
   *
   * @since 1.0.0
   */
  utteranceId: string;

  /**
   * The error message.
   *
   * @since 1.0.0
   */
  error: string;
}

Source Of Truth

This page is generated from the plugin’s src/definitions.ts. Re-run the sync when the public API changes upstream.