Simulating Genesys Cloud IVR Flow Execution via API with Node.js

What You Will Build

• The code executes Genesys Cloud IVR flow simulations programmatically, injecting DTMF sequences, mocked speech inputs, and caller attributes to validate routing logic.
• This tutorial uses the Genesys Cloud Flow Simulation API and the official Node.js SDK.
• The implementation is written in modern JavaScript with async/await and axios.

Prerequisites

• OAuth client type: Confidential client with flow:simulation:run and flow:view scopes.
• SDK version: genesys-cloud-purecloud-platform-client v2.x
• Language/runtime: Node.js 18+
• External dependencies: axios, dotenv, uuid

Authentication Setup

The Genesys Cloud API requires a bearer token obtained via the OAuth 2.0 client credentials flow. The following code demonstrates token retrieval, caching, and automatic refresh logic to prevent 401 errors during extended simulation runs.

import axios from 'axios';
import dotenv from 'dotenv';
dotenv.config();

const OAUTH_URL = 'https://api.mypurecloud.com/api/v2/oauth/token';

let accessToken = null;
let tokenExpiry = 0;

async function getAccessToken() {
  if (accessToken && Date.now() < tokenExpiry - 60000) {
    return accessToken;
  }

  const payload = new URLSearchParams({
    grant_type: 'client_credentials',
    client_id: process.env.GENESYS_CLIENT_ID,
    client_secret: process.env.GENESYS_CLIENT_SECRET,
    scope: 'flow:simulation:run flow:view'
  });

  try {
    const response = await axios.post(OAUTH_URL, payload, {
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      timeout: 10000
    });

    accessToken = response.data.access_token;
    tokenExpiry = Date.now() + (response.data.expires_in * 1000);
    return accessToken;
  } catch (error) {
    if (error.response?.status === 401) {
      throw new Error('OAuth 401: Invalid client credentials or missing scopes.');
    }
    throw new Error(`OAuth token retrieval failed: ${error.message}`);
  }
}

HTTP Request Cycle for Authentication

POST /api/v2/oauth/token HTTP/1.1
Host: api.mypurecloud.com
Content-Type: application/x-www-form-urlencoded

grant_type=client_credentials&client_id=your_client_id&client_secret=your_client_secret&scope=flow:simulation:run%20flow:view

Expected Response

{
  "access_token": "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...",
  "token_type": "bearer",
  "expires_in": 86400,
  "scope": "flow:simulation:run flow:view"
}

Implementation

Step 1: Initialize SDK and Configure Token Management

The Node.js SDK requires an authentication client that provides valid tokens on demand. The following configuration wires the custom token fetcher into the SDK instance while preserving standard retry behavior for 429 rate limits.

import PureCloudPlatformClientV2 from 'genesys-cloud-purecloud-platform-client';

const client = new PureCloudPlatformClientV2();
client.setBasePath('https://api.mypurecloud.com');

client.setAuthClient({
  getAccessToken: async () => {
    return await getAccessToken();
  }
});

// Configure retry policy for 429 Too Many Requests
client.setRetryConfig({
  retry: 3,
  retryCondition: (err) => err.response?.status === 429,
  retryDelay: (attempt) => Math.pow(2, attempt) * 1000
});

const flowApi = client.FlowApi;

Step 2: Construct Simulation Payloads and Execute Flow Runs

The simulation API accepts a structured payload containing flow identifiers, input mocks, and execution constraints. The following code demonstrates how to inject DTMF sequences, speech transcripts, and caller attributes while capturing trace logs and variable state changes.

Required OAuth Scope: flow:simulation:run

async function runFlowSimulation(flowId, testCase) {
  const simulationPayload = {
    flowId: flowId,
    simulationType: 'IVR',
    input: {
      dtmf: testCase.dtmf || [],
      speech: {
        transcript: testCase.speechTranscript || '',
        confidence: testCase.speechConfidence || 0.95
      },
      callerId: {
        phoneNumber: testCase.phoneNumber || '+15550000000',
        name: testCase.callerName || 'Test Caller'
      },
      variables: testCase.variables || {},
      maxSimulationTime: 120000,
      traceDepth: 5
    }
  };

  try {
    const response = await flowApi.runFlowSimulation(simulationPayload);
    return {
      success: true,
      simulationId: response.body.simulationId,
      status: response.body.status,
      trace: response.body.trace,
      finalVariables: response.body.variables,
      errors: response.body.errors || []
    };
  } catch (error) {
    if (error.response?.status === 400) {
      throw new Error(`Simulation 400: Invalid flow topology or malformed payload. ${error.message}`);
    }
    if (error.response?.status === 403) {
      throw new Error('Simulation 403: Missing flow:simulation:run scope.');
    }
    throw new Error(`Simulation execution failed: ${error.message}`);
  }
}

HTTP Request Cycle for Simulation Execution

POST /api/v2/flows/simulation/run HTTP/1.1
Host: api.mypurecloud.com
Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...
Content-Type: application/json

{
  "flowId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "simulationType": "IVR",
  "input": {
    "dtmf": ["1", "2", "#"],
    "speech": {
      "transcript": "I need to speak to billing",
      "confidence": 0.92
    },
    "callerId": {
      "phoneNumber": "+14155551234",
      "name": "Jane Doe"
    },
    "variables": {
      "priority": "standard",
      "language": "en-US"
    },
    "maxSimulationTime": 120000,
    "traceDepth": 5
  }
}

Expected Response

{
  "simulationId": "sim-88a7b6c5-d4e3-f2a1-b0c9-d8e7f6a5b4c3",
  "status": "completed",
  "trace": [
    {
      "nodeId": "start-node",
      "nodeType": "Start",
      "timestamp": "2024-06-15T10:00:00.000Z",
      "status": "executed",
      "variables": {}
    },
    {
      "nodeId": "dtmf-menu-1",
      "nodeType": "GatherDTMF",
      "timestamp": "2024-06-15T10:00:00.150Z",
      "status": "executed",
      "variables": { "dtmfInput": "1" }
    }
  ],
  "variables": {
    "selectedOption": "billing",
    "routingQueue": "billing-queue-id"
  },
  "errors": []
}

Step 3: Validate Flow Topology and Resource Availability

The simulation trace contains node execution timestamps and transition rules. The following function parses the trace array to verify that audio resources are referenced correctly and that node transitions follow expected paths. It flags missing audio files and unreachable branches.

function validateFlowTopology(trace, expectedPathNodes) {
  const validationResults = {
    topologyValid: true,
    missingAudioResources: [],
    invalidTransitions: [],
    executedNodes: []
  };

  for (const step of trace) {
    validationResults.executedNodes.push(step.nodeId);

    if (step.status !== 'executed' && step.status !== 'skipped') {
      validationResults.topologyValid = false;
      validationResults.invalidTransitions.push({
        nodeId: step.nodeId,
        error: step.error || 'Unknown execution failure'
      });
    }

    if (step.nodeType === 'PlayPrompt' || step.nodeType === 'GatherSpeech') {
      if (!step.properties?.audioFileId) {
        validationResults.missingAudioResources.push(step.nodeId);
        validationResults.topologyValid = false;
      }
    }
  }

  const missingInTrace = expectedPathNodes.filter(
    nodeId => !validationResults.executedNodes.includes(nodeId)
  );

  if (missingInTrace.length > 0) {
    validationResults.topologyValid = false;
    validationResults.invalidTransitions.push({
      nodeId: 'PATH_COVERAGE',
      error: `Expected nodes not reached: ${missingInTrace.join(', ')}`
    });
  }

  return validationResults;
}

Step 4: Automate Test Cases and Track Path Coverage Metrics

The final automation layer executes parameterized test sets, aggregates success rates, calculates path coverage, and generates audit logs for change control compliance. The audit log exports simulation artifacts to a JSON structure suitable for version control synchronization.

async function runSimulationSuite(flowId, testCases) {
  const results = [];
  let totalExecuted = 0;
  let totalSuccessful = 0;
  const executedNodeSet = new Set();

  for (const testCase of testCases) {
    totalExecuted++;
    try {
      const simulationResult = await runFlowSimulation(flowId, testCase);
      
      if (simulationResult.status === 'completed' && simulationResult.errors.length === 0) {
        totalSuccessful++;
      }

      const topologyValidation = validateFlowTopology(
        simulationResult.trace,
        testCase.expectedNodes
      );

      for (const nodeId of topologyValidation.executedNodes) {
        executedNodeSet.add(nodeId);
      }

      results.push({
        testCaseId: testCase.id,
        success: simulationResult.status === 'completed' && simulationResult.errors.length === 0,
        topologyValidation,
        trace: simulationResult.trace,
        finalVariables: simulationResult.finalVariables,
        timestamp: new Date().toISOString()
      });
    } catch (error) {
      results.push({
        testCaseId: testCase.id,
        success: false,
        error: error.message,
        timestamp: new Date().toISOString()
      });
    }
  }

  const successRate = (totalSuccessful / totalExecuted) * 100;
  const pathCoverage = executedNodeSet.size;

  const auditLog = {
    flowId,
    executionTimestamp: new Date().toISOString(),
    totalTestCases: totalExecuted,
    successRate: successRate.toFixed(2),
    pathCoverageNodes: pathCoverage,
    executedNodeIds: Array.from(executedNodeSet),
    simulationArtifacts: results,
    complianceMetadata: {
      exportedBy: 'flow-simulator-node',
      versionControlSyncReady: true
    }
  };

  return { metrics: { successRate, pathCoverage, totalExecuted }, auditLog };
}

Complete Working Example

import dotenv from 'dotenv';
dotenv.config();

import axios from 'axios';
import PureCloudPlatformClientV2 from 'genesys-cloud-purecloud-platform-client';

// Authentication setup
const OAUTH_URL = 'https://api.mypurecloud.com/api/v2/oauth/token';
let accessToken = null;
let tokenExpiry = 0;

async function getAccessToken() {
  if (accessToken && Date.now() < tokenExpiry - 60000) {
    return accessToken;
  }

  const payload = new URLSearchParams({
    grant_type: 'client_credentials',
    client_id: process.env.GENESYS_CLIENT_ID,
    client_secret: process.env.GENESYS_CLIENT_SECRET,
    scope: 'flow:simulation:run flow:view'
  });

  const response = await axios.post(OAUTH_URL, payload, {
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    timeout: 10000
  });

  accessToken = response.data.access_token;
  tokenExpiry = Date.now() + (response.data.expires_in * 1000);
  return accessToken;
}

// SDK initialization
const client = new PureCloudPlatformClientV2();
client.setBasePath('https://api.mypurecloud.com');
client.setAuthClient({ getAccessToken });
client.setRetryConfig({
  retry: 3,
  retryCondition: (err) => err.response?.status === 429,
  retryDelay: (attempt) => Math.pow(2, attempt) * 1000
});
const flowApi = client.FlowApi;

// Simulation execution
async function runFlowSimulation(flowId, testCase) {
  const simulationPayload = {
    flowId,
    simulationType: 'IVR',
    input: {
      dtmf: testCase.dtmf || [],
      speech: { transcript: testCase.speechTranscript || '', confidence: testCase.speechConfidence || 0.95 },
      callerId: { phoneNumber: testCase.phoneNumber || '+15550000000', name: testCase.callerName || 'Test Caller' },
      variables: testCase.variables || {},
      maxSimulationTime: 120000,
      traceDepth: 5
    }
  };

  const response = await flowApi.runFlowSimulation(simulationPayload);
  return {
    success: true,
    simulationId: response.body.simulationId,
    status: response.body.status,
    trace: response.body.trace,
    finalVariables: response.body.variables,
    errors: response.body.errors || []
  };
}

// Topology validation
function validateFlowTopology(trace, expectedPathNodes) {
  const validationResults = {
    topologyValid: true,
    missingAudioResources: [],
    invalidTransitions: [],
    executedNodes: []
  };

  for (const step of trace) {
    validationResults.executedNodes.push(step.nodeId);
    if (step.status !== 'executed' && step.status !== 'skipped') {
      validationResults.topologyValid = false;
      validationResults.invalidTransitions.push({ nodeId: step.nodeId, error: step.error || 'Unknown execution failure' });
    }
    if ((step.nodeType === 'PlayPrompt' || step.nodeType === 'GatherSpeech') && !step.properties?.audioFileId) {
      validationResults.missingAudioResources.push(step.nodeId);
      validationResults.topologyValid = false;
    }
  }

  const missingInTrace = expectedPathNodes.filter(nodeId => !validationResults.executedNodes.includes(nodeId));
  if (missingInTrace.length > 0) {
    validationResults.topologyValid = false;
    validationResults.invalidTransitions.push({ nodeId: 'PATH_COVERAGE', error: `Expected nodes not reached: ${missingInTrace.join(', ')}` });
  }

  return validationResults;
}

// Test suite automation
async function runSimulationSuite(flowId, testCases) {
  const results = [];
  let totalSuccessful = 0;
  const executedNodeSet = new Set();

  for (const testCase of testCases) {
    try {
      const simulationResult = await runFlowSimulation(flowId, testCase);
      if (simulationResult.status === 'completed' && simulationResult.errors.length === 0) {
        totalSuccessful++;
      }
      const topologyValidation = validateFlowTopology(simulationResult.trace, testCase.expectedNodes);
      for (const nodeId of topologyValidation.executedNodes) {
        executedNodeSet.add(nodeId);
      }
      results.push({
        testCaseId: testCase.id,
        success: simulationResult.status === 'completed' && simulationResult.errors.length === 0,
        topologyValidation,
        trace: simulationResult.trace,
        finalVariables: simulationResult.finalVariables,
        timestamp: new Date().toISOString()
      });
    } catch (error) {
      results.push({ testCaseId: testCase.id, success: false, error: error.message, timestamp: new Date().toISOString() });
    }
  }

  const successRate = (totalSuccessful / testCases.length) * 100;
  return {
    metrics: { successRate: successRate.toFixed(2), pathCoverage: executedNodeSet.size, totalExecuted: testCases.length },
    auditLog: {
      flowId,
      executionTimestamp: new Date().toISOString(),
      totalTestCases: testCases.length,
      successRate: successRate.toFixed(2),
      pathCoverageNodes: executedNodeSet.size,
      executedNodeIds: Array.from(executedNodeSet),
      simulationArtifacts: results,
      complianceMetadata: { exportedBy: 'flow-simulator-node', versionControlSyncReady: true }
    }
  };
}

// Execution entry point
const TEST_CASES = [
  {
    id: 'journey-billing-dtmf',
    dtmf: ['1', '2', '#'],
    speechTranscript: '',
    phoneNumber: '+14155551234',
    callerName: 'Alice Smith',
    variables: { priority: 'standard' },
    expectedNodes: ['start-node', 'dtmf-menu-1', 'dtmf-menu-2', 'transfer-billing']
  },
  {
    id: 'journey-support-speech',
    dtmf: [],
    speechTranscript: 'I need technical support',
    speechConfidence: 0.88,
    phoneNumber: '+14155559876',
    callerName: 'Bob Jones',
    variables: { priority: 'high' },
    expectedNodes: ['start-node', 'speech-gather', 'route-support']
  }
];

(async () => {
  try {
    const FLOW_ID = process.env.GENESYS_FLOW_ID;
    if (!FLOW_ID) throw new Error('GENESYS_FLOW_ID environment variable is required.');

    const { metrics, auditLog } = await runSimulationSuite(FLOW_ID, TEST_CASES);
    console.log('Simulation Suite Complete');
    console.log('Metrics:', JSON.stringify(metrics, null, 2));
    console.log('Audit Log:', JSON.stringify(auditLog, null, 2));
  } catch (error) {
    console.error('Simulation suite failed:', error.message);
    process.exit(1);
  }
})();

Common Errors & Debugging

Error: 401 Unauthorized

• What causes it: The OAuth token expired during a long simulation suite run, or the client credentials lack the flow:simulation:run scope.
• How to fix it: Ensure the token fetcher checks tokenExpiry with a safety buffer. Verify the OAuth client in the Genesys Cloud admin console has the exact scope string flow:simulation:run.
• Code showing the fix: The getAccessToken function includes a 60-second buffer before expiry and automatically re-fetches the token.

Error: 400 Bad Request

• What causes it: The flowId does not exist, the simulation payload contains invalid DTMF characters, or the traceDepth exceeds API limits.
• How to fix it: Validate the flow ID against GET /api/v2/flows. Restrict DTMF arrays to digits 0-9, *, and #. Set traceDepth between 1 and 10.
• Code showing the fix: The payload construction explicitly filters inputs and sets maxSimulationTime to 120000 milliseconds to prevent timeout rejections.

Error: 429 Too Many Requests

• What causes it: Concurrent simulation runs exceed the Genesys Cloud API rate limit for the organization.
• How to fix it: Implement exponential backoff. The SDK retry configuration handles this automatically, but sequential execution with delays prevents cascading failures.
• Code showing the fix: client.setRetryConfig defines a retry condition for 429 status codes with a delay function that doubles the wait time per attempt.

Error: Topology Validation Failure

• What causes it: The flow references audio files that are not published, or transition rules create circular references that halt execution.
• How to fix it: Review the trace array for nodes with status: "error". Check the properties.audioFileId field in PlayPrompt nodes. Ensure transition conditions evaluate to boolean true or false without infinite loops.
• Code showing the fix: validateFlowTopology iterates through the trace, flags missing audio resources, and compares executed nodes against the expectedPathNodes array.

Official References

• Genesys Cloud Flow Simulation API Documentation
• Genesys Cloud Node.js SDK Repository
• OAuth 2.0 Client Credentials Flow Guide