Segmenting Genesys Cloud Outbound Lists with Node.js

What You Will Build

• This tutorial builds a Node.js service that queries Genesys Cloud outbound contacts, applies boolean segmentation rules, validates against suppression lists, masks sensitive data, tracks list versions, and exposes a preview endpoint for marketing review.
• The implementation uses the Genesys Cloud Outbound API (/api/v2/outbound/contacts, /api/v2/outbound/suppressionlists, /api/v2/outbound/lists) and the official @genesys/cloud-purecloud-sdk.
• The code is written in modern JavaScript using async/await, fetch, and express.

Prerequisites

• OAuth Client Credentials grant with scopes: outbound:contact:read, outbound:list:write, outbound:suppressionlist:read
• SDK: @genesys/cloud-purecloud-sdk version 1.0.0 or later
• Runtime: Node.js 18.0.0 or later
• External dependencies: express, uuid, axios (for retry wrapper)

Authentication Setup

Genesys Cloud uses OAuth 2.0 Client Credentials for server-to-server integrations. The following code demonstrates token acquisition and caching to avoid unnecessary authentication calls.

const axios = require('axios');

const GENESYS_DOMAIN = 'https://api.mypurecloud.com';
const CLIENT_ID = process.env.GENESYS_CLIENT_ID;
const CLIENT_SECRET = process.env.GENESYS_CLIENT_SECRET;

let cachedToken = null;
let tokenExpiry = 0;

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

  const response = await axios.post(`${GENESYS_DOMAIN}/oauth/token`, {
    grant_type: 'client_credentials',
    client_id: CLIENT_ID,
    client_secret: CLIENT_SECRET,
    scope: 'outbound:contact:read outbound:list:write outbound:suppressionlist:read'
  }, {
    headers: { 'Content-Type': 'application/json' }
  });

  cachedToken = response.data.access_token;
  tokenExpiry = Date.now() + (response.data.expires_in * 1000) - 60000; // Refresh 60s early
  return cachedToken;
}

Implementation

Step 1: Initialize SDK and Configure Rate Limit Handling

The official SDK handles authentication internally, but explicit retry logic for 429 Too Many Requests ensures stability during large traversals. Genesys Cloud returns a Retry-After header indicating seconds to wait.

const { PlatformClient } = require('@genesys/cloud-purecloud-sdk');

const client = new PlatformClient();

async function retryOnRateLimit(fn, maxRetries = 5) {
  let attempt = 0;
  while (attempt < maxRetries) {
    try {
      return await fn();
    } catch (error) {
      if (error.status === 429 || (error.response && error.response.status === 429)) {
        const retryAfter = error.headers?.['retry-after'] || Math.pow(2, attempt);
        console.warn(`Rate limited. Waiting ${retryAfter}s before retry ${attempt + 1}/${maxRetries}`);
        await new Promise(resolve => setTimeout(resolve, retryAfter * 1000));
        attempt++;
      } else {
        throw error;
      }
    }
  }
  throw new Error('Max retries exceeded for 429 rate limit');
}

// Initialize SDK with credentials
client.loginClientCredentials(CLIENT_ID, CLIENT_SECRET);

Step 2: Paginate Contacts and Apply Boolean Segmentation Rules

The Outbound Contacts API supports pagination via nextPageUri. Boolean segmentation requires evaluating contact attributes against a rule tree. The following function fetches all contacts with retry logic, then filters them using a recursive boolean evaluator.

async function fetchAllContacts(pageSize = 100) {
  const allContacts = [];
  let nextPageUri = '/api/v2/outbound/contacts';

  while (nextPageUri) {
    const response = await retryOnRateLimit(() => 
      client.outboundApi.getOutboundContacts(pageSize, null, null, nextPageUri)
    );
    if (response.body.entities) {
      allContacts.push(...response.body.entities);
    }
    nextPageUri = response.body.nextPageUri || null;
  }
  return allContacts;
}

function evaluateRule(rule, attributes) {
  if (!rule) return true;
  
  if (rule.and) {
    return rule.and.every(subRule => evaluateRule(subRule, attributes));
  }
  if (rule.or) {
    return rule.or.some(subRule => evaluateRule(subRule, attributes));
  }
  if (rule.not) {
    return !evaluateRule(rule.not, attributes);
  }
  
  // Base case: key-value equality
  if (rule.key && rule.value !== undefined) {
    return String(attributes[rule.key] || '') === String(rule.value);
  }
  return false;
}

function filterContactsByRule(contacts, rule) {
  return contacts.filter(contact => {
    const attrs = contact.attributes || {};
    return evaluateRule(rule, attrs);
  });
}

Required Scope: outbound:contact:read
Endpoint: GET /api/v2/outbound/contacts
Sample Response Snippet:

{
  "entities": [
    {
      "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
      "contactId": "EXT-99887766",
      "phone": "+12025550198",
      "email": "customer@example.com",
      "attributes": { "region": "US", "tier": "premium", "status": "active" },
      "createdTimestamp": "2023-11-15T14:22:00.000Z"
    }
  ],
  "nextPageUri": "/api/v2/outbound/contacts?pageSize=100&pageNumber=2"
}

Step 3: Validate Against Suppression Lists

Compliance requires excluding contacts present in suppression lists. The following function retrieves suppression contacts and filters them out using a Set for constant-time lookups.

async function fetchSuppressionContacts(suppressionListId) {
  const suppressedSet = new Set();
  let nextPageUri = `/api/v2/outbound/suppressionlists/${suppressionListId}/contacts`;

  while (nextPageUri) {
    const response = await retryOnRateLimit(() =>
      client.outboundApi.getOutboundSuppressionlistContacts(suppressionListId, 100, null, null, nextPageUri)
    );
    if (response.body.entities) {
      response.body.entities.forEach(c => suppressedSet.add(c.contactId));
    }
    nextPageUri = response.body.nextPageUri || null;
  }
  return suppressedSet;
}

function validateCompliance(contacts, suppressedIds) {
  return contacts.filter(c => !suppressedIds.has(c.contactId));
}

Required Scope: outbound:suppressionlist:read
Endpoint: GET /api/v2/outbound/suppressionlists/{suppressionListId}/contacts

Step 4: Generate List Identifiers and Track Versioning

Genesys Cloud lists require a unique identifier and support version tracking. We generate a UUID for internal tracking and increment a version counter whenever segmentation parameters change. The list creation payload maps to the Outbound List API.

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

function generateListMetadata(segmentName, version) {
  return {
    id: uuidv4(),
    name: `${segmentName}_v${version}`,
    version,
    createdTimestamp: new Date().toISOString()
  };
}

async function createGenesysList(metadata, contactIds) {
  const listPayload = {
    name: metadata.name,
    description: `Segmented list version ${metadata.version}`,
    sourceType: 'api',
    contacts: contactIds.map(id => ({ contactId: id }))
  };

  const response = await retryOnRateLimit(() =>
    client.outboundApi.postOutboundLists(listPayload)
  );
  return response.body;
}

Required Scope: outbound:list:write
Endpoint: POST /api/v2/outbound/lists

Step 5: Apply Data Masking and Expose Preview Endpoint

Marketing review requires sensitive data masking. The following function redacts phone numbers and emails while preserving segmentation metadata. An Express route exposes the preview pipeline.

function maskSensitiveData(contact) {
  const masked = { ...contact };
  if (masked.phone) {
    masked.phone = masked.phone.replace(/^(.{2})(.*)(.{3})$/, '$1***$3');
  }
  if (masked.email) {
    const [user, domain] = masked.email.split('@');
    masked.email = `${user.charAt(0)}***@${domain}`;
  }
  return masked;
}

const express = require('express');
const app = express();
app.use(express.json());

app.post('/api/v1/lists/preview', async (req, res) => {
  try {
    const { segmentRule, suppressionListId, version = 1 } = req.body;
    
    // 1. Fetch & Paginate
    const allContacts = await fetchAllContacts();
    
    // 2. Boolean Segmentation
    const segmented = filterContactsByRule(allContacts, segmentRule);
    
    // 3. Suppression Validation
    const suppressedIds = suppressionListId ? await fetchSuppressionContacts(suppressionListId) : new Set();
    const compliant = validateCompliance(segmented, suppressedIds);
    
    // 4. Masking & Metadata
    const maskedContacts = compliant.map(maskSensitiveData);
    const metadata = generateListMetadata('marketing_segment', version);
    
    res.json({
      metadata,
      totalContacts: maskedContacts.length,
      contacts: maskedContacts
    });
  } catch (error) {
    console.error('Preview generation failed:', error);
    res.status(error.status || 500).json({ error: error.message });
  }
});

Complete Working Example

The following module combines authentication, pagination, boolean filtering, suppression validation, versioning, masking, and the preview API into a single runnable service.

require('dotenv').config();
const { PlatformClient } = require('@genesys/cloud-purecloud-sdk');
const { v4: uuidv4 } = require('uuid');
const express = require('express');

const GENESYS_DOMAIN = process.env.GENESYS_DOMAIN || 'https://api.mypurecloud.com';
const CLIENT_ID = process.env.GENESYS_CLIENT_ID;
const CLIENT_SECRET = process.env.GENESYS_CLIENT_SECRET;

const client = new PlatformClient();

// --- Authentication & Retry Logic ---
async function retryOnRateLimit(fn, maxRetries = 5) {
  let attempt = 0;
  while (attempt < maxRetries) {
    try {
      return await fn();
    } catch (error) {
      if (error.status === 429 || (error.response && error.response.status === 429)) {
        const retryAfter = error.headers?.['retry-after'] || Math.pow(2, attempt);
        await new Promise(resolve => setTimeout(resolve, retryAfter * 1000));
        attempt++;
      } else {
        throw error;
      }
    }
  }
  throw new Error('Max retries exceeded for 429 rate limit');
}

// --- Data Pipeline ---
async function fetchAllContacts(pageSize = 100) {
  const allContacts = [];
  let nextPageUri = '/api/v2/outbound/contacts';
  while (nextPageUri) {
    const response = await retryOnRateLimit(() => 
      client.outboundApi.getOutboundContacts(pageSize, null, null, nextPageUri)
    );
    if (response.body.entities) allContacts.push(...response.body.entities);
    nextPageUri = response.body.nextPageUri || null;
  }
  return allContacts;
}

function evaluateRule(rule, attributes) {
  if (!rule) return true;
  if (rule.and) return rule.and.every(r => evaluateRule(r, attributes));
  if (rule.or) return rule.or.some(r => evaluateRule(r, attributes));
  if (rule.not) return !evaluateRule(rule.not, attributes);
  if (rule.key && rule.value !== undefined) {
    return String(attributes[rule.key] || '') === String(rule.value);
  }
  return false;
}

function fetchSuppressionContacts(suppressionListId) {
  const suppressedSet = new Set();
  let nextPageUri = `/api/v2/outbound/suppressionlists/${suppressionListId}/contacts`;
  return (async () => {
    while (nextPageUri) {
      const response = await retryOnRateLimit(() =>
        client.outboundApi.getOutboundSuppressionlistContacts(suppressionListId, 100, null, null, nextPageUri)
      );
      if (response.body.entities) response.body.entities.forEach(c => suppressedSet.add(c.contactId));
      nextPageUri = response.body.nextPageUri || null;
    }
    return suppressedSet;
  })();
}

function maskSensitiveData(contact) {
  const masked = { ...contact };
  if (masked.phone) masked.phone = masked.phone.replace(/^(.{2})(.*)(.{3})$/, '$1***$3');
  if (masked.email) {
    const [user, domain] = masked.email.split('@');
    masked.email = `${user.charAt(0)}***@${domain}`;
  }
  return masked;
}

// --- Express Preview API ---
const app = express();
app.use(express.json());

app.post('/api/v1/lists/preview', async (req, res) => {
  try {
    const { segmentRule, suppressionListId, version = 1, segmentName = 'custom_segment' } = req.body;
    
    const allContacts = await fetchAllContacts();
    const segmented = allContacts.filter(c => evaluateRule(segmentRule, c.attributes || {}));
    const suppressedIds = suppressionListId ? await fetchSuppressionContacts(suppressionListId) : new Set();
    const compliant = segmented.filter(c => !suppressedIds.has(c.contactId));
    
    const metadata = {
      id: uuidv4(),
      name: `${segmentName}_v${version}`,
      version,
      createdTimestamp: new Date().toISOString()
    };
    
    res.json({
      metadata,
      totalContacts: compliant.length,
      contacts: compliant.map(maskSensitiveData)
    });
  } catch (error) {
    res.status(error.status || 500).json({ error: error.message });
  }
});

app.listen(3000, () => {
  console.log('Preview API listening on port 3000');
  client.loginClientCredentials(CLIENT_ID, CLIENT_SECRET);
});

Common Errors & Debugging

Error: 401 Unauthorized

• Cause: Expired OAuth token or incorrect client credentials.
• Fix: Verify GENESYS_CLIENT_ID and GENESYS_CLIENT_SECRET environment variables. Ensure the token cache refreshes before expiry. The SDK automatically refreshes tokens when initialized with loginClientCredentials.

Error: 403 Forbidden

• Cause: Missing OAuth scope on the client application.
• Fix: Navigate to the Genesys Cloud Admin Console, locate the OAuth Client, and add outbound:contact:read, outbound:list:write, and outbound:suppressionlist:read to the scopes list. Save and generate a new token.

Error: 429 Too Many Requests

• Cause: Exceeding Genesys Cloud API rate limits during pagination.
• Fix: The retryOnRateLimit wrapper reads the Retry-After header and applies exponential backoff. Ensure your pagination loop respects the delay. Do not parallelize contact fetches without a queue.

Error: Segmentation Rule Returns Empty Array

• Cause: Attribute key mismatch or type coercion failure.
• Fix: Genesys Cloud stores attributes as strings. The evaluateRule function casts both sides to String before comparison. Verify attribute keys match exactly (case-sensitive) using the raw API response.

Official References

• Genesys Cloud Outbound Contacts API Documentation
• Genesys Cloud Outbound Lists API Documentation
• Genesys Cloud Node.js SDK Reference
• Genesys Cloud OAuth 2.0 Client Credentials Guide