what triggers src\app\api\token\route.ts to genera...
# ask-ai
s
what triggers src\app\api\token\route.ts to generate a room?
t
Thanks for reaching out, Nakshatra. I'm an AI assistant and I'm here to help. Give me a moment while I research this topic.
Hey there! Just wanted to walk you through what happens in the file
src\app\api\token\route.ts
when a POST request hits the
/api/token
endpoint. Here’s the scoop: 1. Request Handling: It grabs the incoming request and pulls out important details like API keys and participant info. 2. Validation: It double-checks that all the necessary environment variables (like
LIVEKIT_API_KEY
and
LIVEKIT_API_SECRET
) are set and that the request body has everything it needs. If something’s missing, it lets you know with an error. 3. Room Creation: It creates a unique room name using `Math.random().toString(36).slice(7)`—pretty neat, right? 4. Access Token Generation: Using the LiveKit Server SDK, it makes an
AccessToken
that gives permissions (like joining the room and publishing) through
VideoGrant
. 5. Response: Finally, it sends back the access token and room details so the client can smoothly connect to LiveKit and hop into the room. So basically, this setup creates rooms on the fly based on what comes in, making sure everything’s validated and secure with the right tokens. If you have any questions or want to dive deeper, just let me know—I’m here to help! Sources: web/src/app/api/token/route.ts | web/src/app/api/token/route.ts
s
how do i configure it to create a room everytime I click the 'start' button in my frontend
t
Hey there! If you want your frontend to create a room when the 'start' button is clicked, here’s a simple way to do it: 1. Set Up the Backend: First, create an API endpoint (like
/api/token
) that generates an access token for the room. You can use the LiveKit Server SDK to make this token, making sure it includes permissions such as
roomJoin
and
canPublish
. 2. Frontend Button Click: Next, add an event listener to your 'start' button. When someone clicks it, your frontend will ask the backend for that access token. 3. Connect to the Room: Then, use the LiveKit client SDK to connect to the room by passing the access token and room details to the
connect
method. 4. Handle Room Events: Finally, add some event listeners to keep an eye on room events like disconnections or errors, so you can manage the session smoothly. Here’s a quick example of how your button click handler might look on the frontend:
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document.getElementById('startButton').addEventListener('click', async () => {
  const response = await fetch('/api/token?room=myRoom&username=myUser');
  const data = await response.json();

  if (data.token) {
    const room = new LiveKit.Room();
    await room.connect(process.env.LIVEKIT_SERVER_URL, data.token);
    console.log('Connected to room:', room.name);
  }
});
Just a heads up—make sure your backend keeps those API keys and secrets safe, and your frontend handles connecting and disconnecting from rooms properly. If you run into any bumps, I’m here to help! Sources: Next.js 13+ quickstart | LiveKit Docs | complex-agents/nova-sonic/nova-sonic-form-agent/components/app.tsx | app/api/record/start/route.ts
s
how would this /api/token/route.js be changed to macth the requirement: // accepts both styles and returns token import { NextRequest, NextResponse } from 'next/server'; import { AccessToken } from 'livekit-server-sdk'; import type { AccessTokenOptions, VideoGrant } from 'livekit-server-sdk'; const apiKey = process.env.LK_API_KEY!; const apiSecret = process.env.LK_API_SECRET!; const createToken = async (userInfo: AccessTokenOptions, grant: VideoGrant) => { const at = new AccessToken(apiKey, apiSecret, userInfo); at.addGrant(grant); return await at.toJwt(); }; export async function GET(req: NextRequest) { try { const { searchParams } = new URL(req.url); // Support both patterns: // - room/username (common from tutorials) // - roomName/identity/name/metadata (your current frontend) const room = searchParams.get('room') ?? searchParams.get('roomName') ?? undefined; const username = searchParams.get('username') ?? searchParams.get('identity') ?? undefined; const name = searchParams.get('name') ?? undefined; const metadata = searchParams.get('metadata') ?? undefined; if (!room) throw Error('Missing room/roomName'); if (!username) throw Error('Missing username/identity'); const grant: VideoGrant = { room, roomJoin: true, canPublish: true, canPublishData: true, canSubscribe: true, canUpdateOwnMetadata: true, }; const token = await createToken({ identity: username, name: name ?? undefined, metadata: metadata ?? undefined }, grant); // Return a standard token payload return NextResponse.json({ token }); } catch (e: any) { return new NextResponse(e.message ?? 'Error generating token', { status: 500 }); } }
t
Hey there! If you want to tweak your
/api/token/route.js
file so it smoothly handles both
room/username
and
roomName/identity/name/metadata
patterns, here’s a friendly example you can follow:
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import { NextRequest, NextResponse } from 'next/server';
import { AccessToken } from 'livekit-server-sdk';
import type { AccessTokenOptions, VideoGrant } from 'livekit-server-sdk';

const apiKey = process.env.LK_API_KEY!;
const apiSecret = process.env.LK_API_SECRET!;

const createToken = async (userInfo: AccessTokenOptions, grant: VideoGrant) => {
  const at = new AccessToken(apiKey, apiSecret, userInfo);
  at.addGrant(grant);
  return await at.toJwt();
};

export async function GET(req: NextRequest) {
  try {
    const { searchParams } = new URL(req.url);

    // We’re supporting both patterns here:
    // - room/username (common from tutorials)
    // - roomName/identity/name/metadata (your current frontend)
    const room = searchParams.get('room') ?? searchParams.get('roomName') ?? undefined;
    const username = searchParams.get('username') ?? searchParams.get('identity') ?? undefined;
    const name = searchParams.get('name') ?? undefined;
    const metadata = searchParams.get('metadata') ?? undefined;

    if (!room) throw Error('Missing room/roomName');
    if (!username) throw Error('Missing username/identity');

    const grant: VideoGrant = {
      room,
      roomJoin: true,
      canPublish: true,
      canPublishData: true,
      canSubscribe: true,
      canUpdateOwnMetadata: true,
    };

    const token = await createToken({ identity: username, name: name ?? undefined, metadata: metadata ?? undefined }, grant);

    // Here’s your token, ready to go!
    return NextResponse.json({ token });
  } catch (e: any) {
    return new NextResponse(e.message ?? 'Error generating token', { status: 500 });
  }
}
What’s great about this? • It plays nicely with both
room/username
and
roomName/identity/name/metadata
by checking for multiple parameter names. • It double-checks that the essentials (
room
and
username
) are there, and lets you know if something’s missing. • Gives you a token packed with permissions like
roomJoin
,
canPublish
, and
canSubscribe
. • Returns the token in a neat JSON response, so your frontend can grab it easily. All in all, this approach keeps things compatible whether you’re using older or newer frontend setups, while making sure your token generation stays secure and reliable.
s
the button click handler example you gave, to be added to the frontend. it will go into src\app\page.tsx, right?
t
Absolutely! You can add the button click handler for LiveKit room creation right in
src\app\page.tsx
. This is actually a pretty common approach in Next.js projects, where the main page component takes care of this kind of logic. Here’s a simple example to help you get started:
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// In src/app/page.tsx
const startMeeting = async () => {
  const response = await fetch('/api/token?room=myRoom&username=myUser');
  const data = await response.json();

  if (data.token) {
    const room = new LiveKit.Room();
    await room.connect(process.env.LIVEKIT_SERVER_URL, data.token);
    console.log('Connected to room:', room.name);
  }
};

// In the JSX:
Just a quick heads-up: don’t forget to swap out placeholders like
myRoom
and
myUser
with the actual values you want to use. This way, your button will smoothly kick off the room creation and connection process.
s
my current page.tsx obviously has a lot more elements to it but help me find the appropriate changes to be done to it: 'use client'; import { LiveKitRoom, AudioConference, useRoomContext, StartAudio, RoomName } from '@livekit/components-react'; import { RoomEvent, Track } from 'livekit-client'; import { useCallback, useEffect, useMemo, useRef, useState } from 'react'; // Generates a random user ID for the session function generateRandomUserId() { return `user-${Math.floor(Math.random() * 100000)}`; } export default function AudioExamplePage() { const [mounted, setMounted] = useState(false); const [roomName, setRoomName] = useState<string>('test-room'); const [userIdentity, setUserIdentity] = useState<string>(''); useEffect(() => { setMounted(true); const params = new URLSearchParams(window.location.search); const rn = params.get('room') ?? 'test-room'; setRoomName(rn); const stored = localStorage.getItem('lk-user-id'); if (stored) { setUserIdentity(stored); } else { const uid = params.get('user') ?? generateRandomUserId(); localStorage.setItem('lk-user-id', uid); setUserIdentity(uid); } }, []); const endpoint = process.env.NEXT_PUBLIC_LK_TOKEN_ENDPOINT!; const serverUrl = process.env.NEXT_PUBLIC_LK_SERVER_URL!; const [isStarting, setIsStarting] = useState(false); const [isInRoom, setIsInRoom] = useState(false); const [token, setToken] = useState<string | null>(null); const [error, setError] = useState<string | null>(null); const tokenUrl = useMemo(() => { if (!endpoint || !roomName || !userIdentity) return null; const url = new URL(endpoint); url.searchParams.set('roomName', roomName); url.searchParams.set('identity', userIdentity); url.searchParams.set('name', userIdentity); return url.toString(); }, [endpoint, roomName, userIdentity]); const handleStart = useCallback(async () => { if (!tokenUrl) return; setError(null); setIsStarting(true); try { const res = await fetch(tokenUrl, { method: 'GET' }); if (!res.ok) throw new Error(
Token fetch failed: ${res._status_} ${res._statusText_}
); const json = await res.json(); const t = json?.token ?? json?.accessToken; if (!t || typeof t !== 'string') throw new Error('Token not found in response.'); setToken(t); setIsInRoom(true); } catch (e: any) { setError(e.message || 'Failed to start.'); setToken(null); setIsInRoom(false); } finally { setIsStarting(false); } }, [tokenUrl]); const handleStoppedByChild = useCallback(() => { setIsInRoom(false); setToken(null); }, []); if (!mounted || !userIdentity) { return ( <div className="min-h-screen flex items-center justify-center"> <p role="status" aria-live="polite">Loading…</p> </div> ); } return ( <div data-lk-theme="default" style={{ height: '100vh', width: '100vw', display: 'flex', flexDirection: 'column', background: '#1A1A1A', // Darker background for better contrast color: 'white', }} > <header style={{ padding: '12px 16px', borderBottom: '1px solid #333', display: 'flex', alignItems: 'center', gap: 12 }}> <h1 style={{ fontSize: 22, margin: 0, flex: 1, fontWeight: 600 }}>Real-Time Voice Translation</h1> {!isInRoom ? ( <button type="button" onClick={handleStart} disabled={isStarting || !tokenUrl} style={{ padding: '10px 16px', borderRadius: 8, border: 'none', background: '#007AFF', // A more vibrant start button color: 'white', fontWeight: 500, cursor: isStarting ? 'not-allowed' : 'pointer', transition: 'background-color 0.2s', }} aria-label="Start" > {isStarting ? 'Starting…' : 'Start Session'} </button> ) : null} </header> {error && ( <div role="alert" style={{ padding: '8px 16px', color: '#FF4D4D', background: '#442222' }}> {error} </div> )} {!isInRoom && ( <div style={{ flex: 1, display: 'grid', placeItems: 'center', padding: 16, textAlign: 'center' }}> <div> <h2 style={{ fontSize: 24, fontWeight: 600, marginBottom: 8 }}>Welcome</h2> <p style={{ opacity: 0.8, maxWidth: 400 }}>Click "Start Session" to begin real-time translation</p> </div> </div> )} {isInRoom && token && ( <LiveKitRoom audio video={false} token={token} serverUrl={serverUrl} style={{ flex: 1, display: 'flex', flexDirection: 'column' }} // Changed to flex className="w-full h-full" onDisconnected={handleStoppedByChild} > <StartAudio label="Click to enable audio" /> <ContentGrid /> <div role="toolbar" aria-label="Call controls" style={{ padding: '0 16px 16px' }}> <div style={{ borderRadius: 12, background: 'rgba(0,0,0,0.2)', padding: 12, display: 'flex', justifyContent: 'center', alignItems: 'center', gap: 16 }}> <AudioConference /> <StopButton onStopped={handleStoppedByChild} /> </div> </div> </LiveKitRoom> )} </div> ); } function StopButton({ onStopped }: { onStopped: () => void }) { const room = useRoomContext(); const [stopping, setStopping] = useState(false); const onStop = useCallback(async () => { if (!room || stopping) return; setStopping(true); try { // 🆕 Call FastAPI directly here await fetch(
<http://localhost:8000/api/end-room>
, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ roomName: room.name }), }); } catch (err) { console.error('Error ending room:', err); } finally { setStopping(false); onStopped(); // Update UI state } }, [room, stopping, onStopped]); return ( <button type="button" onClick={onStop} disabled={stopping} style={{ padding: '10px 16px', borderRadius: 8, border: '1px solid #FF4D4D', background: '#FF4D4D', color: 'white', fontWeight: 500, cursor: stopping ? 'not-allowed' : 'pointer', transition: 'background-color 0.2s', }} aria-label="Stop" > {stopping ? 'Stopping…' : 'Stop Session'} </button> ); } function ContentGrid() { // split-screen one return ( <main id="main" role="main" style={{ flex: 1, display: 'grid', gridTemplateColumns: '1fr 1fr', gap: 24, padding: 24, overflowY: 'auto', }} > {/* english*/} <section aria-labelledby="source-heading" style={{ display: 'flex', flexDirection: 'column', background: '#2C2C2E', // A subtle, modern dark grey borderRadius: 12, padding: 20, overflow: 'hidden' }} > <h2 id="source-heading" style={{ fontSize: 20, margin: 0, marginBottom: 16, fontWeight: 600, color: '#E0E0E0' }} lang="en"> Source Language (English) </h2> <div className="sr-only" aria-live="polite" aria-atomic="false" /> <pre style={{ flex: 1, whiteSpace: 'pre-wrap', wordBreak: 'break-word', color: 'white', lineHeight: 1.6, fontFamily: 'monospace', fontSize: 16, background: '#1C1C1E', padding: 16, borderRadius: 8, overflowY: 'auto' }} aria-label="Live English transcript" lang="en" > Speak to start transcription… </pre> </section> {/* Target (Hindi) Section */} <section aria-labelledby="target-heading" style={{ display: 'flex', flexDirection: 'column', background: '#2C2C2E', borderRadius: 12, padding: 20, overflow: 'hidden' }} > <h2 id="target-heading" style={{ fontSize: 20, margin: 0, marginBottom: 16, fontWeight: 600, color: '#E0E0E0' }} lang="hi"> Target Language (Hindi) </h2> <div className="sr-only" aria-live="assertive" aria-atomic="false" /> <pre style={{ flex: 1, whiteSpace: 'pre-wrap', wordBreak: 'break-word', color: 'white', lineHeight: 1.6, fontFamily: 'monospace', fontSize: 16, background: '#1C1C1E', padding: 16, borderRadius: 8, overflowY: 'auto' }} aria-label="Live Hindi translation" lang="hi" > Awaiting translation… </pre> {/* Audio output will play automatically; no visual component needed here unless specified */} </section> </main> ); }
t
Hey there! To get the button click handler working for LiveKit room creation in your existing
page.tsx
, here’s a friendly walkthrough of what you can do: 1. Update the
handleStart
Function:
This part is already covered in your code! It fetches the token and connects to the room using the LiveKit client SDK, so you’re all set here. 2. Modify the Button: Swap out your current "Start Session" button with one that calls the
handleStart
function when clicked. Here’s a simple example:
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<button
  type="button"
  onClick={handleStart}
  disabled={isStarting || !tokenUrl}
  style={{
    padding: '10px 16px',
    borderRadius: 8,
    border: 'none',
    background: '#007AFF',
    color: 'white',
    fontWeight: 500,
    cursor: isStarting ? 'not-allowed' : 'pointer',
    transition: 'background-color 0.2s',
  }}
  aria-label="Start"
>
  {isStarting ? 'Starting…' : 'Start Session'}
</button>
1. Ensure Token Fetching Logic: Your
handleStart
function already fetches the token and updates the room state. Just double-check that your
tokenUrl
is correctly set up and points to your backend API. 2. Integrate Room Connection: The
LiveKitRoom
component is ready to use the token and server URL, so no tweaks needed here. With these tweaks, your
page.tsx
will smoothly handle creating and connecting to a room whenever someone clicks the "Start Session" button. If you run into any bumps or have questions, I’m here to help!
s
isn't it already doing that: <button type="button" onClick={handleStart} disabled={isStarting || !tokenUrl} style={{ padding: '10px 16px', borderRadius: 8, border: 'none', background: '#007AFF', // A more vibrant start button color: 'white', fontWeight: 500, cursor: isStarting ? 'not-allowed' : 'pointer', transition: 'background-color 0.2s', }} aria-label="Start" > {isStarting ? 'Starting…' : 'Start Session'} </button>
t
You're absolutely right—the button in your code is already set up to trigger the
handleStart
function, which takes care of fetching the token and starting the room connection. So, no extra changes are needed for that part. If everything’s working smoothly, you can go ahead and test the flow to make sure the token fetches properly, the room gets created, and the user connects without a hitch. And hey, if you run into any bumps or have questions, just give me a shout—I’m here to help!
s
alright now help me out with the python and fastapi backend. using the stop button in the frontend, the room should be deleted/disconnected gracefully with clean up. tell me if i am wrong but that should be handled by the backend
t
Here’s a friendly guide to help you handle room deletion or disconnection in LiveKit using a FastAPI backend. Let’s walk through it step-by-step: 1. Create a FastAPI Endpoint: You’ll want to set up an API route that deletes a room and disconnects all participants. Check out this example:
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from fastapi import FastAPI, HTTPException
import os
from livekit import api
from livekit.protocol import room as room_proto

app = FastAPI()

LIVEKIT_BASE_URL = os.getenv("LIVEKIT_URL")
LIVEKIT_API_KEY = os.getenv("LIVEKIT_API_KEY")
LIVEKIT_API_SECRET = os.getenv("LIVEKIT_API_SECRET")

@app.post("/api/delete-room")
async def delete_room(room_name: str):
    try:
        # Initialize LiveKit API client
        livekit_client = api.LiveKitAPI(
            base_url=LIVEKIT_BASE_URL,
            api_key=LIVEKIT_API_KEY,
            api_secret=LIVEKIT_API_SECRET,
        )
        
        # Create a DeleteRoomRequest
        delete_request = room_proto.DeleteRoomRequest(room=room_name)
        
        # Delete the room
        await livekit_client.room.delete_room(delete_request)
        
        return {"message": f"Room {room_name} deleted successfully"}
    
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))
1. Connect the Frontend Stop Button: When someone clicks the stop button, send a POST request to your
/api/delete-room
endpoint with the room name. Here’s how you might do it:
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async function handleStopButton() {
    const roomName = "your_room_name";  // Replace with the actual room name
    
    try {
        const response = await fetch(`/api/delete-room`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
            },
            body: JSON.stringify({ room_name: roomName }),
        });
        
        if (!response.ok) {
            throw new Error('Failed to delete room');
        }
        
        const data = await response.json();
        console.log(data.message);
    } catch (error) {
        console.error('Error:', error);
    }
}
1. Secure the Endpoint: It’s important to keep things safe! Add authentication so only authorized folks can delete rooms. FastAPI’s
HTTPBearer
is a great way to handle token-based authentication. 2. Environment Configuration: Make sure your LiveKit API credentials and server URL are set as environment variables (like
LIVEKIT_API_KEY
,
LIVEKIT_API_SECRET
, and
LIVEKIT_URL
). With this setup, your backend will smoothly handle room deletion whenever the stop button is pressed on the frontend. If you run into any bumps or want to chat more about this, just let me know—I’m here to help! Sources: Agents telephony integration | LiveKit Docs | Inside a session | LiveKit Docs | Managing rooms | LiveKit Docs | Managing rooms | LiveKit Docs
s
but room-name isn't fixed though
t
If your room name changes dynamically, no worries—you can easily send it from the frontend to the backend as part of the request body. Here’s a friendly walkthrough on how to tweak your implementation: 1. Frontend: Make sure the stop button sends the current room name to the backend. Here's a simple example:
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async function handleStopButton(roomName) {
    try {
        const response = await fetch(`/api/delete-room`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
            },
            body: JSON.stringify({ room_name: roomName }),
        });
        
        if (!response.ok) {
            throw new Error('Failed to delete room');
        }
        
        const data = await response.json();
        console.log(data.message);
    } catch (error) {
        console.error('Error:', error);
    }
}
1. Backend: Update your FastAPI endpoint to receive the room name dynamically from the request body like this:
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from fastapi import FastAPI, HTTPException, Request
import os
from livekit import api
from livekit.protocol import room as room_proto

app = FastAPI()

LIVEKIT_BASE_URL = os.getenv("LIVEKIT_URL")
LIVEKIT_API_KEY = os.getenv("LIVEKIT_API_KEY")
LIVEKIT_API_SECRET = os.getenv("LIVEKIT_API_SECRET")

@app.post("/api/delete-room")
async def delete_room(request: Request):
    try:
        body = await request.json()
        room_name = body.get("room_name")
        
        if not room_name:
            raise HTTPException(status_code=400, detail="Room name is required")
        
        # Initialize LiveKit API client
        livekit_client = api.LiveKitAPI(
            base_url=LIVEKIT_BASE_URL,
            api_key=LIVEKIT_API_KEY,
            api_secret=LIVEKIT_API_SECRET,
        )
        
        # Create a DeleteRoomRequest
        delete_request = room_proto.DeleteRoomRequest(room=room_name)
        
        # Delete the room
        await livekit_client.room.delete_room(delete_request)
        
        return {"message": f"Room {room_name} deleted successfully"}
    
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))
And that’s it! With this setup, your frontend will send the room name dynamically to the backend, making sure everything stays flexible no matter which room you’re working with.
s
the workflow i am aiming for is that of a translation app, user clicks start, the room is created with the user and agent in it. the user clicks stop, the room ends. if the user clicks start again, it should work again and for that i was hoping that creating a new room would be right as there would be no conflict with the previous rooms
t
Alright, to set up the workflow for your translation app—where a new room pops up every time someone hits "Start" and wraps up when they click "Stop"—here’s a simple way to do it: 1. Start Button: When the user clicks "Start": ◦ Create a unique room name on the fly (think timestamp or a random string). ◦ Send a request to your backend to get a token for this new room. ◦ Connect the user and agent to the room using that token. 1. Stop Button: When the user clicks "Stop": ◦ Send a request to your backend to delete the room by its name. ◦ Make sure your backend disconnects everyone and tidies up the room. 1. Backend: You’ll want to set up endpoints for: ◦ `/api/create-token`: This one makes a token for the new room. ◦ `/api/delete-room`: This one deletes the room and kicks everyone out. Here’s a quick example of how your backend might handle this:
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# Endpoint to create a token for a new room
@app.post("/api/create-token")
async def create_token(room_name: str, user_identity: str):
    try:
        # Initialize LiveKit API client
        livekit_client = api.LiveKitAPI(
            base_url=LIVEKIT_BASE_URL,
            api_key=LIVEKIT_API_KEY,
            api_secret=LIVEKIT_API_SECRET,
        )

        # Generate a token for the user
        token = livekit_client.create_token(
            room=room_name,
            identity=user_identity,
            permissions=["roomJoin", "canPublish", "canSubscribe"]
        )

        return {"token": token}
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

# Endpoint to delete a room
@app.post("/api/delete-room")
async def delete_room(room_name: str):
    try:
        # Initialize LiveKit API client
        livekit_client = api.LiveKitAPI(
            base_url=LIVEKIT_BASE_URL,
            api_key=LIVEKIT_API_KEY,
            api_secret=LIVEKIT_API_SECRET,
        )

        # Delete the room
        livekit_client.delete_room(room_name)

        return {"message": f"Room {room_name} deleted successfully"}
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))
On the frontend side, just make sure every time "Start" is clicked, you generate a unique room name and send it over to your backend. This way, you won’t have any mix-ups with old rooms, and your translation app will run smoothly. If you need any help tweaking this, just let me know!
s
regarding the python backend necessary to keep this functioning, could you check the following code and find any discrepancies: import asyncio import logging from fastapi import FastAPI, HTTPException, Request from fastapi.middleware.cors import CORSMiddleware from livekit import rtc from livekit.agents import JobContext, WorkerOptions, cli from livekit.agents.voice import Agent, AgentSession from livekit.plugins import openai, silero, deepgram, cartesia # Load environment variables as needed here from dotenv import load_dotenv load_dotenv(dotenv_path=".env.local") # Logger config logger = logging.getLogger("listen-and-respond") logging.basicConfig(level=logging.INFO) class SimpleAgent(Agent): def __init__(self): logger.info("starting SimpleAgent\n") super().__init__( instructions="Translate English speech to Hindi only, say nothing else", stt=deepgram.STT(), llm=openai.LLM(model="gpt-4o-mini"), tts=cartesia.TTS( model="sonic-2", voice="28ca2041-5dda-42df-8123-f58ea9c3da00", language="hi" ), vad=silero.VAD.load() ) async def on_enter(self): logger.info(f"Agent entered room: {self.session.rtc.room}\n") self.session.generate_reply() # async def entrypoint(ctx: JobContext): # session = AgentSession() # logger.info(f"Agent joined room: {ctx.room.name}") # await session.start(agent=SimpleAgent(), room=ctx.room) # if hasattr(session, "wait"): # await session.wait() async def entrypoint(ctx: JobContext): session = AgentSession() logger.info(f"Agent job started for room: {ctx.room.name}") async def _on_shutdown(): logger.info(f"Shutdown hook called for room: {ctx.room.name}") ctx.add_shutdown_callback(_on_shutdown) try: await session.start(agent=SimpleAgent(), room=ctx.room) logger.info(f"Agent fully connected to room: {ctx.room.name}") if hasattr(session, "wait"): await session.wait() except Exception as e: logger.exception(f"Agent session error in room {ctx.room.name}: {e}") ctx.shutdown(reason=f"Agent error: {e}") finally: logger.info(f"Stopping agent session for room: {ctx.room.name}") try: await session.stop() logger.info(f"Agent session stopped for room: {ctx.room.name}") except Exception as stop_err: logger.error(f"Error stopping session for room {ctx.room.name}: {stop_err}") if name == "__main__": cli.run_app(WorkerOptions(entrypoint_fnc=entrypoint))
t
Your Python FastAPI backend code for LiveKit integration looks solid and follows LiveKit's recommended patterns nicely. That said, I’ve got a few friendly suggestions to help make it even more reliable and smooth: 1. Error Handling: ◦ It’d be great to add thorough error handling around API operations like
session.start()
and
session.stop()
. This way, if anything unexpected pops up during session management, your app can handle it gracefully. ◦ Also, wrapping API calls (like room creation and deletion) in
try-except
blocks will help catch errors, log them, and give meaningful feedback. 1. Input Validation: ◦ Double-check inputs like room names and participant identities to make sure invalid or malformed data doesn’t cause trouble later on. 1. Agent Session Management: ◦ Make sure to clean up agent sessions properly by handling exceptions during
session.start()
and
session.stop()
. This keeps things tidy and avoids potential issues. 1. Improved Room Management:
Copy code
async def delete_livekit_room(room_name: str) -> bool:
    try:
        async def _delete_room(lkapi):
            delete_request = room_proto.DeleteRoomRequest(room=room_name)
            await lkapi.room.delete_room(delete_request)
            return True

        success = await with_livekit_api(_delete_room)
        return success
    except Exception as e:
        logger.error(f"Failed to delete room {room_name}: {str(e)}")
        return False
◦ Using unique room names—like adding timestamps or random strings—can help avoid conflicts when creating new rooms. ◦ It’s also helpful to have a dedicated function for room deletion with solid error handling. For example: 1. Logging: ◦ Make sure all important actions—like room creation and session start/stop—are logged. This makes debugging and monitoring so much easier down the road. By tackling these points, your backend will be even more robust and ready to handle dynamic room creation and deletion smoothly for your translation app. If you want to chat more or need a hand with anything else, just let me know—I’m here to help! Sources: Inside a session | LiveKit Docs | agent.py | pkg/service/roommanager.go | complex-agents/ivr-agent/flask_livekit/extension.py | Agents Core Architecture | livekit/livekit_composite | DeepWiki
s
but 'AgentSession' object has no attribute 'stop'
t
You're absolutely right—the
AgentSession
object doesn’t have a
stop
method. Instead, you’ll want to use
session.aclose()
to clean up the session properly. Here’s a friendly update to your code that should help:
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async def entrypoint(ctx: JobContext):
    session = AgentSession()
    <http://logger.info|logger.info>(f"Agent job started for room: {ctx.room.name}")

    async def _on_shutdown():
        <http://logger.info|logger.info>(f"Shutdown hook called for room: {ctx.room.name}")
    ctx.add_shutdown_callback(_on_shutdown)

    try:
        await session.start(agent=SimpleAgent(), room=ctx.room)
        <http://logger.info|logger.info>(f"Agent fully connected to room: {ctx.room.name}")

        if hasattr(session, "wait"):
            await session.wait()

    except Exception as e:
        logger.exception(f"Agent session error in room {ctx.room.name}: {e}")
        ctx.shutdown(reason=f"Agent error: {e}")

    finally:
        <http://logger.info|logger.info>(f"Stopping agent session for room: {ctx.room.name}")
        try:
            await session.aclose()
            <http://logger.info|logger.info>(f"Agent session closed for room: {ctx.room.name}")
        except Exception as close_err:
            logger.error(f"Error closing session for room {ctx.room.name}: {close_err}")
So, by swapping out
session.stop()
for
session.aclose()
, you’ll make sure everything tidies up nicely. If you run into any more bumps or have questions, just give me a shout—I’m here to help!
s
i run all 3 files, frontend npm run dev, fastapi uvicorn and python main.py dev but when i click on start in the UI, the backend terminal does not show connection being established so I can't talk to the agent. there are no errors thrown either
t
Hey there! If you’re noticing that the backend isn’t showing a connection when you click "Start" in the UI, no worries — let’s walk through some steps together to figure out what’s going on: 1. Double-check Frontend-Backend Communication: ◦ Take a peek at the browser’s developer tools (Network tab) to see if the frontend is actually sending the right request to the backend. Look for the request to the backend API (like
/api/create-token
) and make sure it’s getting a good response back. ◦ Also, make sure the token the backend creates is valid and has the right permissions for the room you’re trying to join. 1. Peek at Backend Logs: ◦ Check the FastAPI logs to confirm the
/api/create-token
endpoint is being called and that it’s returning a token. ◦ Sometimes things fail quietly — so it’s a good idea to add some logging around token generation and room creation to catch any sneaky issues. 1. Make Sure LiveKit Server is Reachable: ◦ Is your LiveKit server up and running? Double-check the server URL and API credentials in your environment variables to make sure they’re spot on. ◦ Also, confirm that the needed ports (like TCP 443, 7880, 7881, and UDP 7882) are open on your server. 1. Test the Connection Flow: ◦ Try out the LiveKit Connection Tester — it’s great for spotting issues with WebSocket, WebRTC, TURN, and UDP connectivity. ◦ If you suspect network restrictions, you can force TURN usage in the frontend by setting
iceTransportPolicy: 'relay'
. This can help bypass some tricky network setups. 1. Check the Agent Session: ◦ Make sure the
entrypoint
function in your Python backend is actually getting called when the room is created. ◦ Take a look at the logs for the
AgentSession
to see if it’s starting up and connecting to the room properly. By going through these steps, you’ll get a clearer picture of where things might be going sideways and how to fix it. If you hit any snags or want me to walk you through any part, just let me know — I’m here to help! Sources: Firewall Tips | Deploy to a VM | LiveKit Docs | Connecting to LiveKit | LiveKit Docs | Diagnosing Connection Errors with Connection Test Utility | CHANGELOG.md
s
could you get into the details of these steps
t
Hey there! Let’s walk through some troubleshooting steps together to figure out why the backend isn’t showing a connection when you click "Start" in the UI. I’m here to help you get this sorted out! 1. Check Frontend-Backend Communication: ◦ Open your browser’s developer tools (usually F12 or right-click → Inspect → Network tab). ◦ Click the "Start" button in the UI and watch for a network request going to your backend API (something like
/api/create-token
). ◦ Take a look at the request details: ▪︎ Make sure the request method is correct (like POST or GET). ▪︎ Double-check that the request body has the right parameters (room name, user identity, etc.). ◦ Now, check the response: ▪︎ Is the response status 200 (OK)? That’s a good sign. ▪︎ Does the response include a valid token? That’s what we want! 1. Peek at Backend Logs:
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@app.post("/api/create-token")
async def create_token(room_name: str, user_identity: str):
    <http://logger.info|logger.info>(f"Received request to create token for room: {room_name}, user: {user_identity}")
    # Existing token generation logic
◦ Take a look at the FastAPI logs in the terminal where you’re running
uvicorn
. See if there are any logs showing the
/api/create-token
endpoint was called. ◦ If you don’t see anything, try adding some logging inside that endpoint to confirm it’s being hit. For example: 1. Make Sure LiveKit Server is Connected:
Copy code
LIVEKIT_URL=<wss://your-livekit-server.com>
LIVEKIT_API_KEY=your_api_key
LIVEKIT_API_SECRET=your_api_secret
◦ Confirm the LiveKit server is up and running. You can test it by visiting the server URL in your browser or using a tool like
curl
to see if it responds. ◦ Also, double-check that your backend has the right environment variables set for the LiveKit server URL and API credentials. Something like this: ◦ Don’t forget to make sure the necessary ports (TCP 443, 7880, 7881, UDP 7882) are open on the server. You can use tools like
telnet
or
nmap
to check. 1. Test the Connection Flow:
Copy code
const room = new LiveKit.Room({
  iceTransportPolicy: 'relay', // Forces TURN usage
});
◦ Try using the LiveKit Connection Tester to check WebSocket, WebRTC, TURN, and UDP connectivity. It’s great for spotting network issues or misconfigurations. ◦ If needed, you can force TURN usage in your frontend by tweaking the connection setup like this: 1. Check the Agent Session:
Copy code
async def entrypoint(ctx: JobContext):
    <http://logger.info|logger.info>(f"Agent job started for room: {ctx.room.name}")
    # Existing logic
◦ Make sure the
entrypoint
function in your Python backend is actually running when the room is created. Adding some logging can help confirm this: ◦ Look through the logs for the
AgentSession
to see if it’s starting up and connecting to the room. If not, double-check that the room name and token are being passed correctly. Following these steps should help you pinpoint where things might be going sideways and get everything working smoothly. If anything’s unclear or you want a hand with any part, just let me know—I’m happy to help!
s
this is my api/token/route.ts file: import { NextRequest, NextResponse } from 'next/server'; import { AccessToken } from 'livekit-server-sdk'; import type { AccessTokenOptions, VideoGrant } from 'livekit-server-sdk'; const apiKey = process.env.LK_API_KEY!; const apiSecret = process.env.LK_API_SECRET!; const createToken = async (userInfo: AccessTokenOptions, grant: VideoGrant) => { const at = new AccessToken(apiKey, apiSecret, userInfo); at.addGrant(grant); return await at.toJwt(); }; export async function GET(req: NextRequest) { try { const { searchParams } = new URL(req.url); // We’re supporting both patterns here: // - room/username (common from tutorials) // - roomName/identity/name/metadata (your current frontend) const room = searchParams.get('room') ?? searchParams.get('roomName') ?? undefined; const username = searchParams.get('username') ?? searchParams.get('identity') ?? undefined; const name = searchParams.get('name') ?? undefined; const metadata = searchParams.get('metadata') ?? undefined; if (!room) throw Error('Missing room/roomName'); if (!username) throw Error('Missing username/identity'); const grant: VideoGrant = { room, roomJoin: true, canPublish: true, canPublishData: true, canSubscribe: true, canUpdateOwnMetadata: true, }; const token = await createToken({ identity: username, name: name ?? undefined, metadata: metadata ?? undefined }, grant); // Here’s your token, ready to go! return NextResponse.json({ token }); } catch (e: any) { return new NextResponse(e.message ?? 'Error generating token', { status: 500 }); } } what do i add to the fastapi backend to see that the endpoint for creating token was called
t
Hey there! To make sure your FastAPI backend is actually hitting the
/api/token
endpoint, a great way is to add some logging. This way, you can easily see when the endpoint gets called and what parameters are coming through. Here’s a friendly tweak you can make to your FastAPI backend:
Copy code
from fastapi import FastAPI, HTTPException, Request
import logging

app = FastAPI()

# Set up logging
logging.basicConfig(level=<http://logging.INFO|logging.INFO>)
logger = logging.getLogger("token-endpoint")

@app.post("/api/token")
async def create_token(request: Request):
    try:
        # Log when the request arrives
        <http://logger.info|logger.info>("Received request to /api/token")

        # Grab the request body
        body = await request.json()
        room_name = body.get("roomName")
        user_identity = body.get("identity")

        # Log the parameters for you
        <http://logger.info|logger.info>(f"Room Name: {room_name}, User Identity: {user_identity}")

        if not room_name or not user_identity:
            raise HTTPException(status_code=400, detail="Missing roomName or identity")

        # Here’s where you’d generate your token (this is just a placeholder)
        token = "dummy_token"  # Swap this out with your real token logic

        # Log the token that was created
        <http://logger.info|logger.info>(f"Generated token: {token}")

        return {"token": token}
    except Exception as e:
        logger.error(f"Error in /api/token: {str(e)}")
        raise HTTPException(status_code=500, detail="Internal Server Error")
Here’s what you’ll get with this setup: • Each time the
/api/token
endpoint is called, you’ll see a log entry showing the request details. • You can watch your terminal and confirm the endpoint is getting hit and check out the parameters being sent. • If anything goes sideways, these logs will be your best friend to figure out what’s up. If you want me to walk you through anything else or have questions, just give me a shout!
s
Traceback (most recent call last): File "C:\Users\Acer\Desktop\transys\backend\venv\lib\site-packages\livekit\agents\utils\log.py", line 16, in async_fn_logs return await fn(*args, **kwargs) File "C:\Users\Acer\Desktop\transys\backend\venv\lib\site-packages\livekit\agents\cli\watcher.py", line 120, in _read_ipc_task msg = await channel.arecv_message(self._pch, proto.IPC_MESSAGES) File "C:\Users\Acer\Desktop\transys\backend\venv\lib\site-packages\livekit\agents\ipc\channel.py", line 47, in arecv_message return _read_message(await dplx.recv_bytes(), messages) File "C:\Users\Acer\Desktop\transys\backend\venv\lib\site-packages\livekit\agents\utils\aio\duplex_unix.py", line 43, in recv_bytes raise DuplexClosed() from e livekit.agents.utils.aio.duplex_unix.DuplexClosed what is this error i am getting, i wasn't getting this before