/websockets

name: setup-zoom-websockets
description: Reference skill for Zoom WebSockets. Use after routing to a low-latency event workflow when persistent connections, faster event delivery, or security constraints make WebSockets preferable to webhooks.
triggers:
  - "zoom websockets"
  - "websocket event subscription"
  - "persistent zoom events"
  - "low latency zoom events"
  - "zoom websocket connection"

/setup-zoom-websockets

Background reference for persistent Zoom event streams. Prefer workflow routing first, then use this file when WebSockets are plausibly better than webhooks.

WebSockets vs Webhooks

| Aspect | WebSockets | Webhooks | |--------|------------|----------| | **Connection** | Persistent, bidirectional | One-time HTTP POST | | **Latency** | Lower (no HTTP overhead) | Higher (new connection per event) | | **Security** | Direct connection, no exposed endpoint | Requires endpoint validation, IP whitelisting | | **Model** | Pull (you connect to Zoom) | Push (Zoom connects to you) | | **State** | Stateful (maintains connection) | Stateless (each event independent) | | **Setup** | More complex (access token, connection) | Simpler (just endpoint URL) |

**Choose WebSockets when:**

• Real-time, low-latency updates are critical
• Security is paramount (banking, healthcare, finance)
• You don't want to expose a public endpoint
• You need bidirectional communication

**Choose Webhooks when:**

• Simpler setup is preferred
• Small number of event notifications
• Existing HTTP infrastructure

Prerequisites

• Server-to-Server OAuth app in [Zoom Marketplace](https://marketplace.zoom.us/)
• Account ID, Client ID, and Client Secret
• WebSocket subscription with events enabled

> **Need help with S2S OAuth?** See the **[zoom-oauth](../oauth/SKILL.md)** skill for complete authentication flows.

> **Start troubleshooting fast:** Use the **[5-Minute Runbook](RUNBOOK.md)** before deep debugging.

Quick Start

1. Create Server-to-Server OAuth App

1. Go to [Zoom Marketplace](https://marketplace.zoom.us/develop/create) 2. Create a **Server-to-Server OAuth** app 3. Copy Account ID, Client ID, Client Secret

2. Enable WebSocket Subscription

1. In your app, go to **Feature** → **Event Subscriptions** 2. Add an Event Subscription 3. Select **WebSockets** as the method type 4. Select events to subscribe to (e.g., `meeting.created`, `meeting.started`) 5. Save - an endpoint URL will be generated

3. Connect via WebSocket

const WebSocket = require('ws');
const axios = require('axios');

// Step 1: Get access token
async function getAccessToken() {
  const credentials = Buffer.from(`${CLIENT_ID}:${CLIENT_SECRET}`).toString('base64');
  
  const response = await axios.post(
    'https://zoom.us/oauth/token',
    new URLSearchParams({
      grant_type: 'account_credentials',
      account_id: ACCOUNT_ID
    }),
    {
      headers: {
        'Authorization': `Basic ${credentials}`,
        'Content-Type': 'application/x-www-form-urlencoded'
      }
    }
  );
  
  return response.data.access_token;
}

// Step 2: Connect to WebSocket
async function connectWebSocket() {
  const accessToken = await getAccessToken();
  
  // WebSocket URL from your subscription settings
  const wsUrl = `wss://ws.zoom.us/ws?subscriptionId=${SUBSCRIPTION_ID}&access_token=${accessToken}`;
  
  const ws = new WebSocket(wsUrl);
  
  ws.on('open', () => {
    console.log('WebSocket connection established');
  });
  
  ws.on('message', (data) => {
    const event = JSON.parse(data);
    console.log('Event received:', event.event);
    
    // Handle different event types
    switch (event.event) {
      case 'meeting.started':
        console.log(`Meeting started: ${event.payload.object.topic}`);
        break;
      case 'meeting.ended':
        console.log(`Meeting ended: ${event.payload.object.uuid}`);
        break;
      case 'meeting.participant_joined':
        console.log(`Participant joined: ${event.payload.object.participant.user_name}`);
        break;
    }
  });
  
  ws.on('close', (code, reason) => {
    console.log(`Connection closed: ${code} - ${reason}`);
    // Implement reconnection logic
  });
  
  ws.on('error', (error) => {
    console.error('WebSocket error:', error);
  });
  
  return ws;
}

connectWebSocket();

Event Format

Events received via WebSocket have the same format as webhook events:

{
  "event": "meeting.started",
  "event_ts": 1706123456789,
  "payload": {
    "account_id": "abcD3ojkdbjfg",
    "object": {
      "id": 1234567890,
      "uuid": "abcdefgh-1234-5678-abcd-1234567890ab",
      "host_id": "xyz789",
      "topic": "Team Standup",
      "type": 2,
      "start_time": "2024-01-25T10:00:00Z",
      "timezone": "America/Los_Angeles"
    }
  }
}

Common Events

| Event | Description | |-------|-------------| | `meeting.created` | Meeting scheduled | | `meeting.updated` | Meeting settings changed | | `meeting.deleted` | Meeting deleted | | `meeting.started` | Meeting begins | | `meeting.ended` | Meeting ends | | `meeting.participant_joined` | Participant joins meeting | | `meeting.participant_left` | Participant leaves meeting | | `recording.completed` | Cloud recording ready | | `user.created` | New user added | | `user.updated` | User details changed |

Connection Management

Keep-Alive

WebSocket connections require periodic heartbeats. Zoom will close idle connections.

// Send ping every 30 seconds
setInterval(() => {
  if (ws.readyState === WebSocket.OPEN) {
    ws.ping();
  }
}, 30000);

Reconnection

Implement automatic reconnection for reliability:

function connectWithReconnect() {
  const ws = connectWebSocket();
  
  ws.on('close', () => {
    console.log('Connection lost. Reconnecting in 5 seconds...');
    setTimeout(connectWithReconnect, 5000);
  });
  
  return ws;
}

Single Connection Limit

**Important:** Only ONE WebSocket connection can be open per subscript