Next.JS

Learn how to create a web application that enables voice conversations with ElevenLabs AI agents

This tutorial will guide you through creating a web client that can interact with a ElevenLabs agent. You’ll learn how to implement real-time voice conversations, allowing users to speak with an AI agent that can listen, understand, and respond naturally using voice synthesis.

What You’ll Need

An ElevenLabs agent created following this guide
npm installed on your local system.
We’ll use Typescript for this tutorial, but you can use Javascript if you prefer.

Setup

Create a new Next.js project
Open a terminal window and run the following command:
Bash
```
npm create next-app my-conversational-agent
```
It will ask you some questions about how to build your project. We’ll follow the default suggestions for this tutorial.
Navigate to project directory
Bash
```
cd my-conversational-agent
```
Install the ElevenLabs dependency
Bash
```
npm install @elevenlabs/react
```
Test the setup
Run the following command to start the development server and open the provided URL in your browser:
Bash
```
npm run dev
```

Implement ElevenLabs Agents

Create the conversation component

Create a new file app/components/conversation.tsx:

app/components/conversation.tsx

'use client';

import { useConversation } from '@elevenlabs/react';
import { useCallback } from 'react';

export function Conversation() {
  const conversation = useConversation({
    onConnect: () => console.log('Connected'),
    onDisconnect: () => console.log('Disconnected'),
    onMessage: (message) => console.log('Message:', message),
    onError: (error) => console.error('Error:', error),
  });

  const startConversation = useCallback(async () => {
    try {
      // Request microphone permission
      await navigator.mediaDevices.getUserMedia({ audio: true });

      // Start the conversation with your agent
      await conversation.startSession({
        agentId: 'YOUR_AGENT_ID', // Replace with your agent ID
        userId: 'YOUR_CUSTOMER_USER_ID', // Optional field for tracking your end user IDs
      });

    } catch (error) {
      console.error('Failed to start conversation:', error);
    }
  }, [conversation]);

  const stopConversation = useCallback(async () => {
    await conversation.endSession();
  }, [conversation]);

  return (
    <div className="flex flex-col items-center gap-4">
      <div className="flex gap-2">
        <button
          onClick={startConversation}
          disabled={conversation.status === 'connected'}
          className="px-4 py-2 bg-blue-500 text-white rounded disabled:bg-gray-300"
        >
          Start Conversation
        </button>
        <button
          onClick={stopConversation}
          disabled={conversation.status !== 'connected'}
          className="px-4 py-2 bg-red-500 text-white rounded disabled:bg-gray-300"
        >
          Stop Conversation
        </button>
      </div>

      <div className="flex flex-col items-center">
        <p>Status: {conversation.status}</p>
        <p>Agent is {conversation.isSpeaking ? 'speaking' : 'listening'}</p>
      </div>
    </div>
  );
}

Update the main page

Replace the contents of app/page.tsx with:

app/page.tsx

'use client';

import { ConversationProvider } from '@elevenlabs/react';
import { Conversation } from './components/conversation';

export default function Home() {
  return (
    <ConversationProvider>
      <main className="flex min-h-screen flex-col items-center justify-between p-24">
        <div className="z-10 max-w-5xl w-full items-center justify-between font-mono text-sm">
          <h1 className="text-4xl font-bold mb-8 text-center">
            ElevenLabs Agents
          </h1>
          <Conversation />
        </div>
      </main>
    </ConversationProvider>
  );
}

(Optional) Authenticate the agents with a signed URL

If you’re using a private agent that requires authentication, you’ll need to generate a signed URL from your server. This section explains how to set this up.

What You’ll Need

An ElevenLabs account and API key. Sign up here.

Create environment variables
Create a .env.local file in your project root:
.env.local
```
ELEVENLABS_API_KEY=your-api-key-here
NEXT_PUBLIC_AGENT_ID=your-agent-id-here
```
1. Make sure to add .env.local to your .gitignore file to prevent accidentally committing sensitive credentials to version control.
2. Never expose your API key in the client-side code. Always keep it secure on the server.

Create an API route

Create a new file app/api/get-signed-url/route.ts:

app/api/get-signed-url/route.ts

import { NextResponse } from 'next/server';

export async function GET() {
  try {
    const response = await fetch(
      `https://api.elevenlabs.io/v1/convai/conversation/get-signed-url?agent_id=${process.env.NEXT_PUBLIC_AGENT_ID}`,
      {
        headers: {
          'xi-api-key': process.env.ELEVENLABS_API_KEY!,
        },
      }
    );

    if (!response.ok) {
      throw new Error('Failed to get signed URL');
    }

    const data = await response.json();
    return NextResponse.json({ signedUrl: data.signed_url });
  } catch (error) {
    return NextResponse.json(
      { error: 'Failed to generate signed URL' },
      { status: 500 }
    );
  }
}

Update the Conversation component

Modify your conversation.tsx to fetch and use the signed URL:

app/components/conversation.tsx

// ... existing imports ...

export function Conversation() {
  // ... existing conversation setup ...
  const getSignedUrl = async (): Promise<string> => {
    const response = await fetch("/api/get-signed-url");
    if (!response.ok) {
      throw new Error(`Failed to get signed url: ${response.statusText}`);
    }
    const { signedUrl } = await response.json();
    return signedUrl;
  };

  const startConversation = useCallback(async () => {
    try {
      // Request microphone permission
      await navigator.mediaDevices.getUserMedia({ audio: true });

      const signedUrl = await getSignedUrl();

      // Start the conversation with your signed url
      await conversation.startSession({
        signedUrl,
      });

    } catch (error) {
      console.error('Failed to start conversation:', error);
    }
  }, [conversation]);

  // ... rest of the component ...
}

Next Steps

Now that you have a basic implementation, you can:

Add visual feedback for voice activity
Implement error handling and retry logic
Add a chat history display
Customize the UI to match your brand

Search documentation

Help Center

Next.JS

What You’ll Need

Setup

Implement ElevenLabs Agents

What You’ll Need

Next Steps

Help Center