Paginating Genesys Cloud Data Actions API Query Results with Node.js

What You Will Build

• A production-grade Node.js paginator that executes Genesys Cloud Data Actions queries, manages continuation tokens, validates memory constraints, detects stale cursors, verifies sort order consistency, syncs results to an external cache via WebSocket text operations, tracks latency and success rates, and emits structured audit logs.
• This tutorial uses the Genesys Cloud Architecture Data Actions API endpoint /api/v2/architect/dataactions/{dataActionId}/execute.
• The implementation covers Node.js 18+ using native fetch, the ws library for WebSocket operations, and standard JavaScript async/await patterns.

Prerequisites

• Genesys Cloud OAuth Client ID and Client Secret with dataactions:execute and analytics:query scopes.
• Node.js 18.0 or higher.
• External dependencies: ws (for WebSocket cache synchronization), uuid (for audit log correlation).
• A deployed Data Action ID in your Genesys Cloud organization that supports pagination parameters in its data payload.

Authentication Setup

Genesys Cloud uses OAuth 2.0 Client Credentials flow for server-to-server API access. You must cache the token and handle expiration before pagination begins.

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

async function acquireToken(clientId, clientSecret) {
  const response = await fetch(`${BASE_URL}${TOKEN_ENDPOINT}`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      grant_type: 'client_credentials',
      client_id: clientId,
      client_secret: clientSecret,
      scope: 'dataactions:execute analytics:query'
    })
  });

  if (!response.ok) {
    const errorBody = await response.text();
    throw new Error(`OAuth token acquisition failed (${response.status}): ${errorBody}`);
  }

  const data = await response.json();
  return {
    accessToken: data.access_token,
    expiresAt: Date.now() + (data.expires_in * 1000)
  };
}

The token object contains an expiresAt timestamp. Your pagination loop must verify this timestamp before each API call and refresh if Date.now() >= expiresAt.

Implementation

Step 1: Initialize Paginator Configuration and Memory Validation

Pagination payloads require a cursor-ref (maps to pageToken), a page-matrix (defines pageSize and maxPages), and a fetch directive (the query execution body). You must validate these against memory constraints before execution.

class DataActionPaginator {
  constructor(config) {
    this.dataActionId = config.dataActionId;
    this.cursorRef = null; // Initializes to null for first page
    this.pageMatrix = {
      pageSize: config.pageSize || 100,
      maxPages: config.maxPages || 50,
      maxBatchMemoryMB: config.maxBatchMemoryMB || 50
    };
    this.fetchDirective = {
      query: config.query,
      sortField: config.sortField || 'created_date',
      sortOrder: config.sortOrder || 'desc'
    };
    this.metrics = {
      totalFetched: 0,
      successCount: 0,
      failureCount: 0,
      latencies: [],
      pagesProcessed: 0
    };
    this.auditLog = [];
    this.externalCacheWs = null;
  }

  validateMemoryConstraints(results) {
    const estimatedBytes = new Blob([JSON.stringify(results)]).size;
    const estimatedMB = estimatedBytes / (1024 * 1024);
    if (estimatedMB > this.pageMatrix.maxBatchMemoryMB) {
      throw new Error(`Memory constraint exceeded: ${estimatedMB.toFixed(2)}MB exceeds limit of ${this.pageMatrix.maxBatchMemoryMB}MB`);
    }
    if (results.length > this.pageMatrix.pageSize) {
      throw new Error(`Result count ${results.length} exceeds pageSize ${this.pageMatrix.pageSize}`);
    }
    return true;
  }
}

The validateMemoryConstraints method prevents pagination failure by enforcing strict batch size and memory limits before processing results.

Step 2: Construct Pagination Payload and Execute Fetch Directive

The Genesys Cloud Data Actions execute endpoint expects a JSON body with a data property. You map your internal configuration to this structure. You must also implement retry logic for 429 Too Many Requests responses.

  async executeFetchDirective(accessToken) {
    const payload = {
      data: {
        ...this.fetchDirective,
        pageSize: this.pageMatrix.pageSize,
        pageToken: this.cursorRef
      }
    };

    const url = `${BASE_URL}/api/v2/architect/dataactions/${this.dataActionId}/execute`;
    let retries = 0;
    const maxRetries = 3;
    const baseDelay = 1000;

    while (retries <= maxRetries) {
      try {
        const response = await fetch(url, {
          method: 'POST',
          headers: {
            'Authorization': `Bearer ${accessToken}`,
            'Content-Type': 'application/json',
            'Accept': 'application/json'
          },
          body: JSON.stringify(payload)
        });

        if (response.status === 429) {
          const retryAfter = response.headers.get('Retry-After') || baseDelay;
          retries++;
          await new Promise(resolve => setTimeout(resolve, retryAfter * 1000));
          continue;
        }

        if (!response.ok) {
          const errorText = await response.text();
          throw new Error(`API request failed (${response.status}): ${errorText}`);
        }

        const startTime = Date.now();
        const result = await response.json();
        const latency = Date.now() - startTime;
        this.metrics.latencies.push(latency);

        return result;
      } catch (error) {
        if (retries === maxRetries) throw error;
        retries++;
      }
    }
  }

Expected Response Structure:

{
  "data": {
    "results": [
      { "id": "conv-1", "created_date": "2024-01-15T10:00:00.000Z", "wrapup_code": "positive" },
      { "id": "conv-2", "created_date": "2024-01-15T09:59:00.000Z", "wrapup_code": "negative" }
    ],
    "pageToken": "eyJwYWdlIjoyLCJzb3J0IjoiY3JlYXRlZF9kYXRlIn0=",
    "totalCount": 1540
  },
  "warnings": [],
  "errors": []
}

Step 3: Evaluate Continuation Tokens and Handle Offset Logic

After receiving results, you must evaluate the continuation token. If pageToken is null or matches the previous token, pagination has completed. You also track offset progression to prevent infinite loops.

  evaluateContinuation(responseData) {
    const nextPageToken = responseData.data?.pageToken || null;
    const results = responseData.data?.results || [];
    
    // Stale cursor detection: if token repeats or results are empty after first page
    if (this.pageMatrix.pagesProcessed > 0 && nextPageToken === this.cursorRef) {
      throw new Error('Stale cursor detected: continuation token has not advanced');
    }
    
    if (results.length === 0 && this.pageMatrix.pagesProcessed > 0) {
      return false; // Pagination complete
    }
    
    this.cursorRef = nextPageToken;
    return true; // Continue pagination
  }

Step 4: Implement Stale Cursor Checking and Sort Order Verification Pipelines

Data consistency requires verifying that records across pages follow the declared sort order. You compare the boundary values of consecutive pages to detect drift caused by backend scaling or concurrent data mutations.

  verifySortOrder(currentResults, previousResults) {
    if (!previousResults || previousResults.length === 0) return true;
    
    const sortField = this.fetchDirective.sortField;
    const sortOrder = this.fetchDirective.sortOrder;
    const lastPrevious = previousResults[previousResults.length - 1][sortField];
    const firstCurrent = currentResults[0][sortField];
    
    if (sortOrder === 'desc') {
      if (firstCurrent >= lastPrevious) {
        return false; // Sort order violation: descending data is not strictly decreasing
      }
    } else {
      if (firstCurrent <= lastPrevious) {
        return false; // Sort order violation: ascending data is not strictly increasing
      }
    }
    
    return true;
  }

This verification pipeline prevents duplicate records and ensures consistent data retrieval during Genesys Cloud scaling events.

Step 5: Synchronize Pagination Events via WebSocket and Track Metrics

You synchronize each fetched page to an external cache using atomic WebSocket text operations. You also record latency, success rates, and generate audit logs for governance.

  async syncToExternalCache(results, pageToken) {
    if (!this.externalCacheWs) return;
    
    const cacheMessage = JSON.stringify({
      eventType: 'PAGE_FETCHED',
      dataActionId: this.dataActionId,
      pageToken: pageToken,
      recordCount: results.length,
      timestamp: new Date().toISOString()
    });
    
    this.externalCacheWs.send(cacheMessage);
  }

  recordAuditEntry(action, status, details) {
    this.auditLog.push({
      id: require('crypto').randomUUID(),
      action,
      status,
      details,
      timestamp: new Date().toISOString(),
      metrics: {
        pagesProcessed: this.metrics.pagesProcessed,
        totalFetched: this.metrics.totalFetched,
        successRate: this.metrics.totalFetched > 0 
          ? ((this.metrics.successCount / (this.metrics.successCount + this.metrics.failureCount)) * 100).toFixed(2) + '%' 
          : '0%'
      }
    });
  }

Complete Working Example

The following module combines all components into a single runnable paginator. It exposes a run method that handles authentication, pagination loops, validation, cache synchronization, and metric reporting.

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

class DataActionPaginator {
  constructor(config) {
    this.dataActionId = config.dataActionId;
    this.cursorRef = null;
    this.pageMatrix = {
      pageSize: config.pageSize || 100,
      maxPages: config.maxPages || 50,
      maxBatchMemoryMB: config.maxBatchMemoryMB || 50
    };
    this.fetchDirective = {
      query: config.query,
      sortField: config.sortField || 'created_date',
      sortOrder: config.sortOrder || 'desc'
    };
    this.metrics = {
      totalFetched: 0,
      successCount: 0,
      failureCount: 0,
      latencies: [],
      pagesProcessed: 0
    };
    this.auditLog = [];
    this.externalCacheWs = null;
    this.previousPageResults = null;
  }

  validateMemoryConstraints(results) {
    const estimatedBytes = new Blob([JSON.stringify(results)]).size;
    const estimatedMB = estimatedBytes / (1024 * 1024);
    if (estimatedMB > this.pageMatrix.maxBatchMemoryMB) {
      throw new Error(`Memory constraint exceeded: ${estimatedMB.toFixed(2)}MB exceeds limit of ${this.pageMatrix.maxBatchMemoryMB}MB`);
    }
    if (results.length > this.pageMatrix.pageSize) {
      throw new Error(`Result count ${results.length} exceeds pageSize ${this.pageMatrix.pageSize}`);
    }
    return true;
  }

  verifySortOrder(currentResults, previousResults) {
    if (!previousResults || previousResults.length === 0) return true;
    const sortField = this.fetchDirective.sortField;
    const sortOrder = this.fetchDirective.sortOrder;
    const lastPrevious = previousResults[previousResults.length - 1][sortField];
    const firstCurrent = currentResults[0][sortField];
    
    if (sortOrder === 'desc') {
      return firstCurrent < lastPrevious;
    }
    return firstCurrent > lastPrevious;
  }

  async executeFetchDirective(accessToken) {
    const payload = {
      data: {
        ...this.fetchDirective,
        pageSize: this.pageMatrix.pageSize,
        pageToken: this.cursorRef
      }
    };

    const url = `https://api.mypurecloud.com/api/v2/architect/dataactions/${this.dataActionId}/execute`;
    let retries = 0;
    const maxRetries = 3;

    while (retries <= maxRetries) {
      try {
        const response = await fetch(url, {
          method: 'POST',
          headers: {
            'Authorization': `Bearer ${accessToken}`,
            'Content-Type': 'application/json',
            'Accept': 'application/json'
          },
          body: JSON.stringify(payload)
        });

        if (response.status === 429) {
          const retryAfter = response.headers.get('Retry-After') || 1;
          retries++;
          await new Promise(resolve => setTimeout(resolve, retryAfter * 1000));
          continue;
        }

        if (!response.ok) {
          const errorText = await response.text();
          throw new Error(`API request failed (${response.status}): ${errorText}`);
        }

        const startTime = Date.now();
        const result = await response.json();
        this.metrics.latencies.push(Date.now() - startTime);
        return result;
      } catch (error) {
        if (retries === maxRetries) throw error;
        retries++;
      }
    }
  }

  async run(credentials, cacheWsUrl) {
    let tokenData = await this._acquireToken(credentials);
    this.externalCacheWs = new WebSocket(cacheWsUrl);
    await new Promise((resolve, reject) => {
      this.externalCacheWs.on('open', resolve);
      this.externalCacheWs.on('error', reject);
    });

    const allResults = [];

    try {
      while (this.metrics.pagesProcessed < this.pageMatrix.maxPages) {
        if (Date.now() >= tokenData.expiresAt) {
          tokenData = await this._acquireToken(credentials);
        }

        const response = await this.executeFetchDirective(tokenData.accessToken);
        const results = response.data?.results || [];
        
        this.validateMemoryConstraints(results);
        
        if (!this.verifySortOrder(results, this.previousPageResults)) {
          throw new Error('Sort order verification failed: data consistency compromised');
        }

        this.metrics.successCount++;
        this.metrics.totalFetched += results.length;
        this.metrics.pagesProcessed++;
        allResults.push(...results);

        await this.syncToExternalCache(results, this.cursorRef);
        this.recordAuditEntry('PAGE_FETCHED', 'SUCCESS', `Fetched ${results.length} records`);

        const shouldContinue = this.evaluateContinuation(response);
        this.previousPageResults = results;

        if (!shouldContinue) break;
      }
    } catch (error) {
      this.metrics.failureCount++;
      this.recordAuditEntry('PAGINATION_FAILED', 'ERROR', error.message);
      throw error;
    } finally {
      if (this.externalCacheWs.readyState === WebSocket.OPEN) {
        this.externalCacheWs.close();
      }
    }

    return {
      results: allResults,
      metrics: this.metrics,
      auditLog: this.auditLog
    };
  }

  evaluateContinuation(responseData) {
    const nextPageToken = responseData.data?.pageToken || null;
    const results = responseData.data?.results || [];
    
    if (this.metrics.pagesProcessed > 0 && nextPageToken === this.cursorRef) {
      throw new Error('Stale cursor detected: continuation token has not advanced');
    }
    
    if (results.length === 0 && this.metrics.pagesProcessed > 0) {
      return false;
    }
    
    this.cursorRef = nextPageToken;
    return true;
  }

  async syncToExternalCache(results, pageToken) {
    if (!this.externalCacheWs) return;
    const cacheMessage = JSON.stringify({
      eventType: 'PAGE_FETCHED',
      dataActionId: this.dataActionId,
      pageToken: pageToken,
      recordCount: results.length,
      timestamp: new Date().toISOString()
    });
    this.externalCacheWs.send(cacheMessage);
  }

  recordAuditEntry(action, status, details) {
    this.auditLog.push({
      id: crypto.randomUUID(),
      action,
      status,
      details,
      timestamp: new Date().toISOString(),
      metrics: {
        pagesProcessed: this.metrics.pagesProcessed,
        totalFetched: this.metrics.totalFetched,
        successRate: this.metrics.totalFetched > 0 
          ? ((this.metrics.successCount / (this.metrics.successCount + this.metrics.failureCount)) * 100).toFixed(2) + '%' 
          : '0%'
      }
    });
  }

  async _acquireToken(credentials) {
    const response = await fetch('https://api.mypurecloud.com/v2/oauth/token', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        grant_type: 'client_credentials',
        client_id: credentials.clientId,
        client_secret: credentials.clientSecret,
        scope: 'dataactions:execute analytics:query'
      })
    });
    if (!response.ok) throw new Error(`OAuth failed: ${await response.text()}`);
    const data = await response.json();
    return { accessToken: data.access_token, expiresAt: Date.now() + (data.expires_in * 1000) };
  }
}

module.exports = { DataActionPaginator };

Common Errors & Debugging

Error: 400 Bad Request - Invalid pageToken or pageSize

• What causes it: The pageToken is malformed, expired, or pageSize exceeds the endpoint maximum (typically 1000 for Data Actions).
• How to fix it: Reset this.cursorRef to null to trigger a fresh query. Verify pageSize stays within 1 to 1000.
• Code showing the fix:

if (response.status === 400 && response.body.includes('pageToken')) {
  this.cursorRef = null;
  this.recordAuditEntry('COURSE_RESET', 'WARNING', 'Invalid pageToken detected, resetting pagination cursor');
}

Error: 429 Too Many Requests

• What causes it: Rate limit cascade across Genesys Cloud microservices. The API returns a Retry-After header.
• How to fix it: Implement exponential backoff. The executeFetchDirective method already handles this by reading Retry-After and delaying subsequent requests.
• Code showing the fix: Handled in the retry loop within executeFetchDirective.

Error: Sort Order Verification Failed

• What causes it: Concurrent data mutations during pagination, or incorrect sortField/sortOrder configuration.
• How to fix it: Add a secondary stable sort key (e.g., id) to the fetchDirective. Ensure sortField matches an indexable column in the Data Action definition.
• Code showing the fix:

this.fetchDirective = {
  ...this.fetchDirective,
  sortField: 'created_date',
  secondarySortField: 'id',
  sortOrder: 'desc'
};

Error: Memory Constraint Exceeded

• What causes it: Complex query results exceed maxBatchMemoryMB or pageSize returns oversized JSON payloads.
• How to fix it: Reduce pageSize in pageMatrix. Filter unnecessary fields in the Data Action definition to shrink payload size.
• Code showing the fix: Adjust constructor config: pageSize: 50, maxBatchMemoryMB: 25.

Official References

• Genesys Cloud Data Actions API Documentation
• Genesys Cloud OAuth 2.0 Authentication Guide
• Genesys Cloud Pagination Patterns
• Node.js WebSocket Library (ws)