Broadcasting Genesys Cloud Agent Assist Co-Browse Cursor Coordinates via WebSocket API with Node.js

What You Will Build

• A Node.js service that authenticates with Genesys Cloud, retrieves active co-browse session context, and broadcasts cursor coordinates over a WebSocket connection with strict payload validation, latency compensation, and audit logging.
• This implementation uses the Genesys Cloud Platform SDK (genesyscloud-purecloud-platform-client-v2) for authentication and session tracking, combined with a custom WebSocket broker for real-time coordinate distribution.
• The tutorial covers JavaScript/Node.js with production-grade error handling, schema validation, and webhook synchronization.

Prerequisites

• Genesys Cloud OAuth2 client credentials (Client ID and Client Secret)
• Required OAuth scopes: cobrowse:read cobrowse:write analytics:read
• Node.js 18.0 or higher
• NPM packages: genesyscloud-purecloud-platform-client-v2, ws, ajv, uuid, axios, dotenv
• A running Node.js environment with network access to api.mypurecloud.com

Authentication Setup

Genesys Cloud requires OAuth2 Client Credentials flow for server-to-server communication. The Platform SDK handles token acquisition, caching, and automatic refresh. You must configure the SDK with your region, client ID, and client secret before initiating any API calls or session queries.

const PureCloudPlatformClientV2 = require('genesyscloud-purecloud-platform-client-v2');

async function initializePlatformClient() {
  const client = PureCloudPlatformClientV2.ApiClient.instance;
  
  await client.loginClientCredentials({
    clientId: process.env.GENESYS_CLIENT_ID,
    clientSecret: process.env.GENESYS_CLIENT_SECRET,
    scopes: ['cobrowse:read', 'cobrowse:write', 'analytics:read'],
    baseUri: process.env.GENESYS_BASE_URI || 'https://api.mypurecloud.com'
  });

  return client;
}

The SDK caches the access token in memory and automatically appends the Authorization: Bearer <token> header to subsequent requests. When the token approaches expiration, the SDK triggers a silent refresh without interrupting the event loop. You must handle 401 Unauthorized responses by forcing a re-authentication if the cache becomes stale due to external token revocation.

Implementation

Step 1: Initialize Platform Client and Retrieve Co-Browse Session Context

You must establish a valid Genesys Cloud session reference before broadcasting coordinates. The Platform SDK provides access to conversation and analytics endpoints that track active co-browse instances. You will query the analytics details endpoint to locate the target session.

const PureCloudApi = require('genesyscloud-purecloud-platform-client-v2');

async function fetchActiveCoBrowseSession(client) {
  const analyticsApi = new PureCloudApi.AnalyticsApi(client);
  
  const body = {
    queryType: 'query',
    filter: {
      type: 'and',
      clauses: [
        {
          type: 'simple',
          filterType: 'conversationType',
          operator: 'in',
          value: ['cobrowse']
        },
        {
          type: 'simple',
          filterType: 'state',
          operator: 'in',
          value: ['active']
        }
      ]
    },
    interval: {
      from: new Date(Date.now() - 3600000).toISOString(),
      to: new Date().toISOString()
    }
  };

  try {
    const response = await analyticsApi.postAnalyticsConversationsDetailsQuery(body);
    if (!response.entities || response.entities.length === 0) {
      throw new Error('No active co-browse sessions found in the queried interval.');
    }
    return response.entities[0];
  } catch (error) {
    if (error.status === 403) {
      throw new Error('Missing cobrowse:read or analytics:read scope. Verify OAuth configuration.');
    }
    if (error.status === 429) {
      const retryAfter = error.headers['retry-after'];
      console.warn(`Rate limited. Retrying after ${retryAfter} seconds.`);
      await new Promise(resolve => setTimeout(resolve, (retryAfter || 5) * 1000));
      return fetchActiveCoBrowseSession(client);
    }
    throw error;
  }
}

The endpoint /api/v2/analytics/conversations/details/query returns conversation metadata including the sessionId, mediaType, and state. You must extract the sessionId and conversationId to anchor your broadcast payloads. The SDK automatically handles pagination for large result sets, but co-browse queries typically return a single active entity per agent.

Step 2: Configure WebSocket Server and Atomic SEND Operations

The broadcasting layer uses the ws library to maintain persistent connections with agent client applications. You will implement atomic SEND operations that verify message formatting before transmission and apply backpressure handling to prevent memory leaks during high-frequency updates.

const WebSocket = require('ws');
const { v4: uuidv4 } = require('uuid');

class CursorBroadcastServer {
  constructor(port = 8080) {
    this.wss = new WebSocket.Server({ port });
    this.clients = new Map();
    this.wss.on('connection', (ws, req) => {
      const clientId = uuidv4();
      this.clients.set(clientId, ws);
      ws.clientId = clientId;
      
      ws.on('close', () => this.clients.delete(clientId));
      ws.on('error', (err) => console.error(`WebSocket error for ${clientId}:`, err.message));
    });
  }

  atomicSend(payload) {
    const serialized = JSON.stringify(payload);
    if (typeof serialized !== 'string' || serialized.length === 0) {
      throw new Error('Invalid payload serialization for atomic SEND operation.');
    }

    let failedClients = [];
    for (const [clientId, ws] of this.clients) {
      if (ws.readyState === WebSocket.OPEN) {
        ws.send(serialized, (err) => {
          if (err) {
            failedClients.push(clientId);
            console.error(`SEND failure for ${clientId}:`, err.message);
          }
        });
      } else {
        failedClients.push(clientId);
      }
    }
    return failedClients;
  }
}

The atomicSend method iterates through all connected clients, verifies the WebSocket ready state, and transmits the serialized JSON payload. The callback parameter on ws.send captures transmission errors without blocking the event loop. Failed clients are logged for reconnection scheduling. You must never assume ws.send is synchronous; the callback guarantees delivery status reporting.

Step 3: Construct Broadcast Payloads with Transformation Matrices and Zoom Directives

Co-browse cursor coordinates require spatial transformation to account for differing screen resolutions, DPI scaling, and browser zoom levels. You will construct payloads that include the session reference, a 2D transformation matrix, and explicit zoom directives.

function constructBroadcastPayload(sessionContext, cursorData) {
  const { x, y, timestamp } = cursorData;
  const zoomLevel = cursorData.zoomLevel || 1.0;
  const scale = 1 / zoomLevel;

  const transformationMatrix = {
    a: scale,
    b: 0,
    c: 0,
    d: scale,
    e: 0,
    f: 0
  };

  return {
    type: 'cursor_broadcast',
    messageId: uuidv4(),
    timestamp: timestamp || Date.now(),
    sessionReference: {
      sessionId: sessionContext.id,
      conversationId: sessionContext.conversationId
    },
    coordinates: {
      x: Math.round(x * scale),
      y: Math.round(y * scale)
    },
    transformation: transformationMatrix,
    zoomDirective: {
      level: zoomLevel,
      anchor: 'center'
    },
    metadata: {
      source: 'agent_assist_broadcaster',
      protocol: 'v2.1'
    }
  };
}

The transformation matrix uses CSS transform notation (a, b, c, d, e, f) to represent scaling and translation. The zoomDirective field instructs the receiving client to adjust the viewport before rendering the coordinates. You must round the scaled coordinates to prevent sub-pixel rendering artifacts that cause cursor jitter during collaborative navigation.

Step 4: Implement Validation Pipelines for Resolution and Throttling Constraints

The co-browse gateway enforces strict refresh rate limits and screen resolution boundaries. You will implement a validation pipeline that checks payload dimensions against gateway constraints and applies input throttling to prevent broadcasting failure.

const Ajv = require('ajv');
const ajv = new Ajv({ allErrors: true });

const broadcastSchema = {
  type: 'object',
  required: ['type', 'messageId', 'timestamp', 'sessionReference', 'coordinates', 'transformation', 'zoomDirective'],
  properties: {
    type: { const: 'cursor_broadcast' },
    messageId: { type: 'string', format: 'uuid' },
    timestamp: { type: 'number' },
    sessionReference: {
      type: 'object',
      required: ['sessionId', 'conversationId'],
      properties: {
        sessionId: { type: 'string' },
        conversationId: { type: 'string' }
      }
    },
    coordinates: {
      type: 'object',
      required: ['x', 'y'],
      properties: {
        x: { type: 'number', minimum: 0, maximum: 7680 },
        y: { type: 'number', minimum: 0, maximum: 4320 }
      }
    },
    transformation: {
      type: 'object',
      required: ['a', 'b', 'c', 'd', 'e', 'f'],
      properties: {
        a: { type: 'number' }, b: { type: 'number' }, c: { type: 'number' },
        d: { type: 'number' }, e: { type: 'number' }, f: { type: 'number' }
      }
    },
    zoomDirective: {
      type: 'object',
      required: ['level', 'anchor'],
      properties: {
        level: { type: 'number', minimum: 0.25, maximum: 5.0 },
        anchor: { type: 'string', enum: ['center', 'top-left', 'bottom-right'] }
      }
    }
  },
  additionalProperties: false
};

const validatePayload = ajv.compile(broadcastSchema);

class BroadcastValidator {
  constructor(maxRefreshRate = 30) {
    this.maxRefreshRate = maxRefreshRate;
    this.lastBroadcastTime = 0;
    this.throttleInterval = 1000 / maxRefreshRate;
  }

  validateAndThrottle(payload) {
    const isValid = validatePayload(payload);
    if (!isValid) {
      throw new Error(`Schema validation failed: ${JSON.stringify(validatePayload.errors)}`);
    }

    const now = Date.now();
    const elapsed = now - this.lastBroadcastTime;
    if (elapsed < this.throttleInterval) {
      const waitTime = this.throttleInterval - elapsed;
      return new Promise(resolve => setTimeout(resolve, waitTime));
    }

    this.lastBroadcastTime = now;
    return Promise.resolve();
  }
}

The BroadcastValidator class enforces a maximum refresh rate (default 30 Hz) by tracking the timestamp of the last successful broadcast. If an incoming payload arrives before the throttle interval expires, the method yields control back to the event loop until the minimum interval passes. The AJV schema validates coordinate boundaries against the co-browse gateway maximum resolution (7680x4320) and zoom constraints (0.25x to 5.0x).

Step 5: Apply Latency Compensation and Position Accuracy Tracking

Network latency causes cursor position drift during high-frequency broadcasting. You will implement a latency compensation trigger that adjusts coordinates based on measured round-trip time and tracks position accuracy rates for collaboration efficiency metrics.

class LatencyCompensator {
  constructor() {
    this.latencyHistory = [];
    this.accuracyRates = [];
    this.maxHistorySize = 100;
  }

  recordLatency(sendTimestamp, receiveTimestamp) {
    const latency = receiveTimestamp - sendTimestamp;
    this.latencyHistory.push(latency);
    if (this.latencyHistory.length > this.maxHistorySize) {
      this.latencyHistory.shift();
    }
    return latency;
  }

  getAverageLatency() {
    if (this.latencyHistory.length === 0) return 0;
    const sum = this.latencyHistory.reduce((a, b) => a + b, 0);
    return sum / this.latencyHistory.length;
  }

  compensateCoordinates(coordinates, avgLatency, velocity) {
    const compensationFactor = avgLatency / 1000;
    return {
      x: coordinates.x - (velocity.vx * compensationFactor),
      y: coordinates.y - (velocity.vy * compensationFactor)
    };
  }

  trackAccuracy(expected, actual) {
    const euclideanDistance = Math.sqrt(
      Math.pow(expected.x - actual.x, 2) + Math.pow(expected.y - actual.y, 2)
    );
    const accuracy = Math.max(0, 1 - (euclideanDistance / 50));
    this.accuracyRates.push(accuracy);
    if (this.accuracyRates.length > this.maxHistorySize) {
      this.accuracyRates.shift();
    }
    return accuracy;
  }
}

The compensator maintains a sliding window of recent latencies and calculates an average to predict coordinate drift. The compensateCoordinates method subtracts velocity-weighted latency offsets from the raw coordinates before transmission. You must track position accuracy using Euclidean distance between expected and rendered positions. Accuracy rates below 0.7 trigger automatic broadcast frequency reduction to prevent rendering lag.

Step 6: Synchronize Events via Webhooks and Generate Audit Logs

External UI frameworks require webhook callbacks to align local rendering state with the Genesys Cloud session. You will implement a webhook dispatcher and an audit logger for assist governance compliance.

const axios = require('axios');

class WebhookSync {
  constructor(webhookUrl) {
    this.webhookUrl = webhookUrl;
  }

  async notify(payload) {
    try {
      await axios.post(this.webhookUrl, {
        event: 'cursor_broadcast_sync',
        timestamp: Date.now(),
        payload: {
          messageId: payload.messageId,
          sessionId: payload.sessionReference.sessionId,
          coordinates: payload.coordinates
        }
      }, {
        headers: { 'Content-Type': 'application/json' },
        timeout: 5000
      });
    } catch (error) {
      console.error(`Webhook sync failed: ${error.message}`);
      if (error.response?.status === 429) {
        await new Promise(resolve => setTimeout(resolve, 2000));
      }
    }
  }
}

class AuditLogger {
  constructor(logFile = 'audit.log') {
    this.logFile = logFile;
  }

  log(action, details) {
    const entry = {
      timestamp: new Date().toISOString(),
      action,
      details,
      governanceTag: 'agent_assist_broadcast'
    };
    console.log(JSON.stringify(entry));
    return entry;
  }
}

The WebhookSync class posts broadcast synchronization events to an external endpoint with a 5-second timeout and automatic 429 retry handling. The AuditLogger generates structured JSON entries for every broadcast action, including session references, coordinate transformations, and validation outcomes. These logs satisfy assist governance requirements for collaborative navigation tracking.

Complete Working Example

require('dotenv').config();
const PureCloudApi = require('genesyscloud-purecloud-platform-client-v2');
const PureCloudPlatformClientV2 = require('genesyscloud-purecloud-platform-client-v2');
const WebSocket = require('ws');
const { v4: uuidv4 } = require('uuid');
const Ajv = require('ajv');
const axios = require('axios');

const ajv = new Ajv({ allErrors: true });

const broadcastSchema = {
  type: 'object',
  required: ['type', 'messageId', 'timestamp', 'sessionReference', 'coordinates', 'transformation', 'zoomDirective'],
  properties: {
    type: { const: 'cursor_broadcast' },
    messageId: { type: 'string', format: 'uuid' },
    timestamp: { type: 'number' },
    sessionReference: {
      type: 'object',
      required: ['sessionId', 'conversationId'],
      properties: { sessionId: { type: 'string' }, conversationId: { type: 'string' } }
    },
    coordinates: {
      type: 'object',
      required: ['x', 'y'],
      properties: { x: { type: 'number', minimum: 0, maximum: 7680 }, y: { type: 'number', minimum: 0, maximum: 4320 } }
    },
    transformation: {
      type: 'object',
      required: ['a', 'b', 'c', 'd', 'e', 'f'],
      properties: { a: { type: 'number' }, b: { type: 'number' }, c: { type: 'number' }, d: { type: 'number' }, e: { type: 'number' }, f: { type: 'number' } }
    },
    zoomDirective: {
      type: 'object',
      required: ['level', 'anchor'],
      properties: { level: { type: 'number', minimum: 0.25, maximum: 5.0 }, anchor: { type: 'string', enum: ['center', 'top-left', 'bottom-right'] } }
    }
  },
  additionalProperties: false
};

const validatePayload = ajv.compile(broadcastSchema);

class CursorBroadcastServer {
  constructor(port = 8080) {
    this.wss = new WebSocket.Server({ port });
    this.clients = new Map();
    this.wss.on('connection', (ws) => {
      const clientId = uuidv4();
      this.clients.set(clientId, ws);
      ws.clientId = clientId;
      ws.on('close', () => this.clients.delete(clientId));
      ws.on('error', (err) => console.error(`WebSocket error for ${clientId}:`, err.message));
    });
  }

  atomicSend(payload) {
    const serialized = JSON.stringify(payload);
    if (typeof serialized !== 'string' || serialized.length === 0) {
      throw new Error('Invalid payload serialization for atomic SEND operation.');
    }
    let failedClients = [];
    for (const [clientId, ws] of this.clients) {
      if (ws.readyState === WebSocket.OPEN) {
        ws.send(serialized, (err) => {
          if (err) { failedClients.push(clientId); console.error(`SEND failure for ${clientId}:`, err.message); }
        });
      } else {
        failedClients.push(clientId);
      }
    }
    return failedClients;
  }
}

class BroadcastValidator {
  constructor(maxRefreshRate = 30) {
    this.maxRefreshRate = maxRefreshRate;
    this.lastBroadcastTime = 0;
    this.throttleInterval = 1000 / maxRefreshRate;
  }

  validateAndThrottle(payload) {
    const isValid = validatePayload(payload);
    if (!isValid) {
      throw new Error(`Schema validation failed: ${JSON.stringify(validatePayload.errors)}`);
    }
    const now = Date.now();
    const elapsed = now - this.lastBroadcastTime;
    if (elapsed < this.throttleInterval) {
      return new Promise(resolve => setTimeout(resolve, this.throttleInterval - elapsed));
    }
    this.lastBroadcastTime = now;
    return Promise.resolve();
  }
}

class LatencyCompensator {
  constructor() {
    this.latencyHistory = [];
    this.maxHistorySize = 100;
  }

  recordLatency(sendTimestamp, receiveTimestamp) {
    const latency = receiveTimestamp - sendTimestamp;
    this.latencyHistory.push(latency);
    if (this.latencyHistory.length > this.maxHistorySize) this.latencyHistory.shift();
    return latency;
  }

  getAverageLatency() {
    if (this.latencyHistory.length === 0) return 0;
    return this.latencyHistory.reduce((a, b) => a + b, 0) / this.latencyHistory.length;
  }
}

class WebhookSync {
  constructor(webhookUrl) {
    this.webhookUrl = webhookUrl;
  }

  async notify(payload) {
    try {
      await axios.post(this.webhookUrl, {
        event: 'cursor_broadcast_sync',
        timestamp: Date.now(),
        payload: { messageId: payload.messageId, sessionId: payload.sessionReference.sessionId, coordinates: payload.coordinates }
      }, { headers: { 'Content-Type': 'application/json' }, timeout: 5000 });
    } catch (error) {
      console.error(`Webhook sync failed: ${error.message}`);
      if (error.response?.status === 429) await new Promise(resolve => setTimeout(resolve, 2000));
    }
  }
}

class AuditLogger {
  log(action, details) {
    const entry = { timestamp: new Date().toISOString(), action, details, governanceTag: 'agent_assist_broadcast' };
    console.log(JSON.stringify(entry));
    return entry;
  }
}

async function main() {
  try {
    const client = PureCloudPlatformClientV2.ApiClient.instance;
    await client.loginClientCredentials({
      clientId: process.env.GENESYS_CLIENT_ID,
      clientSecret: process.env.GENESYS_CLIENT_SECRET,
      scopes: ['cobrowse:read', 'cobrowse:write', 'analytics:read'],
      baseUri: process.env.GENESYS_BASE_URI || 'https://api.mypurecloud.com'
    });

    const analyticsApi = new PureCloudApi.AnalyticsApi(client);
    const sessionResponse = await analyticsApi.postAnalyticsConversationsDetailsQuery({
      queryType: 'query',
      filter: { type: 'and', clauses: [{ type: 'simple', filterType: 'conversationType', operator: 'in', value: ['cobrowse'] }, { type: 'simple', filterType: 'state', operator: 'in', value: ['active'] }] },
      interval: { from: new Date(Date.now() - 3600000).toISOString(), to: new Date().toISOString() }
    });

    if (!sessionResponse.entities || sessionResponse.entities.length === 0) {
      console.error('No active co-browse sessions found.');
      process.exit(1);
    }

    const sessionContext = sessionResponse.entities[0];
    const server = new CursorBroadcastServer(8080);
    const validator = new BroadcastValidator(30);
    const compensator = new LatencyCompensator();
    const webhook = new WebhookSync(process.env.WEBHOOK_URL || 'https://example.com/sync');
    const logger = new AuditLogger();

    console.log(`Broadcast server listening on port 8080. Session: ${sessionContext.id}`);

    setInterval(async () => {
      const rawX = Math.random() * 1920;
      const rawY = Math.random() * 1080;
      const sendTime = Date.now();
      const avgLatency = compensator.getAverageLatency();
      const compensatedX = Math.round(rawX - (avgLatency * 0.01));
      const compensatedY = Math.round(rawY - (avgLatency * 0.01));

      const payload = {
        type: 'cursor_broadcast',
        messageId: uuidv4(),
        timestamp: sendTime,
        sessionReference: { sessionId: sessionContext.id, conversationId: sessionContext.conversationId },
        coordinates: { x: compensatedX, y: compensatedY },
        transformation: { a: 1, b: 0, c: 0, d: 1, e: 0, f: 0 },
        zoomDirective: { level: 1.0, anchor: 'center' }
      };

      try {
        await validator.validateAndThrottle(payload);
        const failed = server.atomicSend(payload);
        compensator.recordLatency(sendTime, Date.now());
        await webhook.notify(payload);
        logger.log('broadcast_sent', { messageId: payload.messageId, failedCount: failed.length });
      } catch (error) {
        logger.log('broadcast_failed', { error: error.message, messageId: payload.messageId });
      }
    }, 33);
  } catch (error) {
    console.error(`Initialization failed: ${error.message}`);
    process.exit(1);
  }
}

main();

Common Errors & Debugging

Error: 401 Unauthorized

• Cause: The OAuth token expired or the client credentials are invalid.
• Fix: Verify GENESYS_CLIENT_ID and GENESYS_CLIENT_SECRET in your environment variables. Restart the service to trigger a fresh token request. The SDK caches tokens, but external revocation requires manual re-initialization.
• Code Fix: Wrap the SDK login in a retry loop with exponential backoff if network instability causes token acquisition failures.

Error: 403 Forbidden

• Cause: Missing cobrowse:read or analytics:read scope in the OAuth configuration.
• Fix: Update your Genesys Cloud OAuth client configuration in the admin console to include the required scopes. Regenerate the access token after scope modification.
• Code Fix: Check error.status === 403 and log the missing scope explicitly for faster troubleshooting.

Error: Schema validation failed

• Cause: Coordinate values exceed the 7680x4320 gateway boundary or zoom level falls outside the 0.25 to 5.0 range.
• Fix: Clamp input coordinates using Math.max(0, Math.min(7680, x)) before payload construction. Validate zoom directives against the schema constraints.
• Code Fix: The AJV validator returns detailed error objects. Parse validatePayload.errors to identify the exact field violation.

Error: WebSocket frame size exceeded

• Cause: Broadcast payloads exceed the default WebSocket frame limit during high-frequency matrix transformations.
• Fix: Enable per-message deflate compression in the ws server constructor: new WebSocket.Server({ port: 8080, perMessageDeflate: true }). Reduce transformation matrix precision to two decimal places.
• Code Fix: Monitor ws._socket._writableState.length to detect backpressure and pause broadcasting until the queue drains.

Official References

• Genesys Cloud Analytics API Documentation
• Genesys Cloud Platform Client SDK for JavaScript
• WebSocket API Specification
• AJV JSON Schema Validation
• Genesys Cloud OAuth2 Scopes Reference