sveltekit openai realtime api

this is a svelte component for using the openai realtime api (and mostly a direct port to svelte of the openai-realtime-console repository).

it allows you to easily use the openai realtime api in your svelte(kit) project.

work in progress, but it should be functional.

demos here (enter your own api key, as always be careful with stuff like that and e.g. use a 2$ limited api key):

basic chat: https://flo-bit.dev/svelte-openai-realtime-api/

chat with visualizations: https://flo-bit.dev/svelte-openai-realtime-api/visualizations-chat

https://github.com/user-attachments/assets/67d94a6c-ee44-4834-a9dd-a628b4a4e093

how to use

[!WARNING] this is the setup for the client side only version of the realtime api, you will need to use a relay server to use this in production. see further down for more information on how to use a relay server.

1. copy the src/lib/realtime/ folder from this repository into your sveltekit projects src/lib/ folder

2. install the dependency:

$ npm i openai/openai-realtime-api-beta

3. import the Realtime component into your svelte file and use it e.g. like so:

<script lang="ts">
    import Realtime from '$lib/realtime/Realtime.svelte';
    import type { ItemType } from '@openai/realtime-api-beta/dist/lib/client';

    let startConversation: () => Promise<void>;
    let endConversation: () => Promise<void>;

    let turnDetection: 'server_vad' | 'none' = 'server_vad';

    let items: ItemType[] = [];

    let isConnected = false;
    let isRecording = false;

    let startRecording: () => Promise<void>;
    let stopRecording: () => Promise<void>;

    // set your api key here
    let apiKey = '';
</script>

{#if apiKey}
    <Realtime
        bind:startConversation
        bind:endConversation
        bind:isConnected
        bind:isRecording
        bind:startRecording
        bind:stopRecording
        bind:items
        {turnDetection}
        {apiKey}
    />
{/if}

see src/routes/+page.svelte for a full example.

visualization

see src/routes/visulizations-chat/+page.svelte for an example of how to visualize the audio input and output. and src/routes/visulizations-input/+page.svelte for all currently available visualizations.

demo here: https://flo-bit.dev/svelte-openai-realtime-api/visualizations-input

relay server

for production use, you will need to use a relay server to use the realtime api.

1. add OPENAI_API_KEY to your .env file

2. tell the Realtime component to use the relay server:

<Realtime useRelayServer />

then you have two options:

run the relay server with your sveltekit server

[!WARNING] this currently only works in development mode, if you want to use this in production you will need to run the relay server independently. if you have any ideas on how to make this work in production, please let me know.

change your vite.config.ts to this:

import { realtimeWebSocketServer } from './src/lib/realtime/realtime_server';
import { sveltekit } from '@sveltejs/kit/vite';
import { defineConfig } from 'vite';

export default defineConfig({
    plugins: [sveltekit(), realtimeWebSocketServer]
});

run the relay server independently

• copy the relay-server/ folder (identical to the code in the openai-realtime-console repository) from this repository into your project

• install the dependencies:

npm i dotenv openai/openai-realtime-api-beta

• run the relay server:

$ node relay-server/index.js

• add the relay server url to your Realtime component:

<Realtime useRelayServer relayServer="http://localhost:8081" />

todos

• show waveforms
• add tests
• update main demo ui
• add more documentation
  • simple setup client side, server side
  • all props
• tool calling
• events
  • onConnect
  • onDisconnect
  • onError
  • onInterrupt
  • onRealtimeEvent
  • onConversationUpdate
  • speechStart
  • speechStop
• error handling
• pause/resume recording
• send text message
• update props
  • instructions
  • voice
  • vad settings

license

MIT