Ultravox Client SDK (JavaScript)

This is the web client library for Ultravox.

Written in TypeScript, this library allows you to easily integrate Ultravox's real-time, speech-to-speech AI into web applications.

Quick Start

import { UltravoxSession } from 'ultravox-client';

const session = new UltravoxSession();
session.joinCall('wss://your-call-join-url');

session.leaveCall();

Note: Join URL's are created using the Ultravox API. See the docs for more info.

Events

If we continue with the quick start code above, we can add event listeners for two events:

session.addEventListener('status', (event) => {
  console.log('Session status changed: ', session.status);
});

session.addEventListener('transcripts', (event) => {
  console.log('Transcripts updated: ', session.transcripts);
});

Session Status

The session status is based on the UltravoxSessionStatus enum and can be one of the following:

state	description
disconnected	The session is not connected and not attempting to connect. This is the initial state.
disconnecting	The client is disconnecting from the session.
connecting	The client is attempting to connect to the session.
idle	The client is connected to the session and the server is warming up.
listening	The client is connected and the server is listening for voice input.
thinking	The client is connected and the server is considering its response. The user can still interrupt.
speaking	The client is connected and the server is playing response audio. The user can interrupt as needed.

Transcripts

Transcripts are an array of transcript objects. Each transcript has the following properties:

property	type	definition
text	string	Text transcript of the speech from the end user or the agent.
isFinal	boolean	True if the transcript represents a complete utterance. False if it is a fragment of an utterance that is still underway.
speaker	Role	Either "user" or "agent". Denotes who was speaking.
medium	Medium	Either "voice" or "text". Denotes how the message was sent.

Testing SDK Versions

This repo includes a basic example application that can be used with the SDK. The example application requires running a local web server:

pnpm serve-example

Then navigate your browser to http://localhost:8080/example/ and use the example.

Missing version.js file

If build fails because it cannot find './version.js', run the following:

pnpm publish --dry-run --git-checks=false