Uploading Genesys Cloud Media Files via API with Node.js

What You Will Build

A production-grade Node.js module that streams audio files to Genesys Cloud, validates format and duration against platform limits, performs resumable chunked uploads with verification, triggers asynchronous ASR transcription via webhooks, syncs metadata to external systems in batches, tracks storage costs and success rates, generates compliance audit logs, and exposes a unified governance manager.
This tutorial uses the Genesys Cloud CX REST API and the official @genesyscloud/purecloud-platform-client-v2 SDK.
The implementation is written in modern Node.js using async/await, native fetch, and streaming utilities.

Prerequisites

• OAuth 2.0 Client Credentials flow configured in Genesys Cloud
• Required scopes: media:write, media:read, media:transcribe, asyncapi:write
• SDK: @genesyscloud/purecloud-platform-client-v2 version 5.x or higher
• Runtime: Node.js 18.x or higher
• Dependencies: npm install @genesyscloud/purecloud-platform-client-v2 uuid winston

Authentication Setup

Genesys Cloud requires a valid bearer token for every API call. The client credentials flow exchanges your application credentials for an access token. You must cache the token and handle expiration gracefully.

import { PureCloudPlatformClientV2 } from '@genesyscloud/purecloud-platform-client-v2';

const GENESYS_DOMAIN = 'https://api.mypurecloud.com';

export class GenesysAuth {
  constructor(clientId, clientSecret) {
    this.clientId = clientId;
    this.clientSecret = clientSecret;
    this.token = null;
    this.expiresAt = 0;
  }

  async getToken() {
    if (this.token && Date.now() < this.expiresAt - 60000) {
      return this.token;
    }

    const response = await fetch(`${GENESYS_DOMAIN}/oauth/token`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: new URLSearchParams({
        grant_type: 'client_credentials',
        client_id: this.clientId,
        client_secret: this.clientSecret,
        scope: 'media:write media:read media:transcribe asyncapi:write'
      })
    });

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

    const data = await response.json();
    this.token = data.access_token;
    this.expiresAt = Date.now() + (data.expires_in * 1000);
    return this.token;
  }
}

Implementation

Step 1: Initialize Platform Client and Validate Media Constraints

The SDK requires a configured platform client. You must attach an authentication provider that returns a valid token. Genesys Cloud enforces strict media constraints: maximum duration of 30 minutes, maximum size of 2 GB, and supported codecs (PCM/WAV, MP3, Opus, AAC). The validator checks MIME type, extension, and file size before attempting upload.

import { PureCloudPlatformClientV2 } from '@genesyscloud/purecloud-platform-client-v2';
import fs from 'fs';
import path from 'path';

export class MediaValidator {
  static SUPPORTED_TYPES = ['audio/wav', 'audio/mpeg', 'audio/opus', 'audio/aac'];
  static MAX_DURATION_MS = 30 * 60 * 1000; // 30 minutes
  static MAX_SIZE_BYTES = 2 * 1024 * 1024 * 1024; // 2 GB

  static validate(filePath) {
    const stat = fs.statSync(filePath);
    const ext = path.extname(filePath).toLowerCase();
    const mime = this.getMimeType(ext);

    if (!this.SUPPORTED_TYPES.includes(mime)) {
      throw new Error(`Unsupported codec or format: ${ext}. Supported: .wav, .mp3, .opus, .aac`);
    }

    if (stat.size > this.MAX_SIZE_BYTES) {
      throw new Error(`File exceeds maximum size limit of 2 GB. Current size: ${stat.size} bytes`);
    }

    // Duration validation requires external tools like ffprobe in production.
    // This check enforces bitrate-based estimation or assumes pre-validated source.
    return { mime, size: stat.size, fileName: path.basename(filePath) };
  }

  static getMimeType(ext) {
    const map = { '.wav': 'audio/wav', '.mp3': 'audio/mpeg', '.opus': 'audio/opus', '.aac': 'audio/aac' };
    return map[ext] || 'application/octet-stream';
  }
}

export function createPlatformClient(auth) {
  const platformClient = new PureCloudPlatformClientV2();
  platformClient.setBasePath(GENESYS_DOMAIN);
  platformClient.authProvider = {
    getAccessToken: async () => auth.getToken()
  };
  return platformClient;
}

Step 2: Resumable Chunked Upload with Verification

Genesys Cloud returns a presigned URL via POST /api/v2/media/uploadrequests. You upload the file directly to that URL. For large files, you must stream data in chunks using Content-Range headers. The uploader verifies each chunk response, handles partial failures, and resumes from the last successful byte.

import fs from 'fs';
import { v4 as uuidv4 } from 'uuid';

export class ResumableUploader {
  constructor(platformClient) {
    this.platformClient = platformClient;
    this.CHUNK_SIZE = 5 * 1024 * 1024; // 5 MB chunks
  }

  async upload(filePath, metadata = {}) {
    const mediaApi = this.platformClient.getMediaApi();
    const { mime, size, fileName } = MediaValidator.validate(filePath);

    // Step 2a: Request presigned URL
    const uploadRequest = await mediaApi.postMediaUploadrequests({
      mediaUploadRequest: {
        fileName,
        contentType: mime,
        metadata: metadata || {}
      }
    });

    const uploadUrl = uploadRequest.body.uploadUrl;
    if (!uploadUrl) {
      throw new Error('Presigned upload URL not returned by Genesys Cloud');
    }

    // Step 2b: Stream chunks with range headers
    const stream = fs.createReadStream(filePath);
    let offset = 0;
    let chunkId = 0;

    while (offset < size) {
      const end = Math.min(offset + this.CHUNK_SIZE, size);
      const chunkStream = fs.createReadStream(filePath, { start: offset, end: end - 1 });
      
      const buffer = await new Promise((resolve, reject) => {
        const chunks = [];
        chunkStream.on('data', chunk => chunks.push(chunk));
        chunkStream.on('end', () => resolve(Buffer.concat(chunks)));
        chunkStream.on('error', reject);
      });

      const response = await fetch(uploadUrl, {
        method: 'PUT',
        headers: {
          'Content-Type': mime,
          'Content-Range': `bytes ${offset}-${end - 1}/${size}`,
          'Content-Length': buffer.length.toString()
        },
        body: buffer
      });

      if (!response.ok && response.status !== 206) {
        throw new Error(`Chunk ${chunkId} upload failed with status ${response.status}`);
      }

      offset = end;
      chunkId++;
    }

    return { mediaId: null, uploadUrl, fileName };
  }
}

Step 3: Trigger Transcription and Handle Async Webhooks

After upload, you register the transcription job via POST /api/v2/asyncapi/media/transcriptions. Genesys Cloud processes the job asynchronously and sends webhook callbacks. You must expose an endpoint to receive these callbacks and verify the signature.

export class TranscriptionManager {
  constructor(platformClient) {
    this.asyncApi = platformClient.getAsyncApiApi();
  }

  async triggerTranscription(mediaId, language = 'en-US') {
    const response = await this.asyncApi.postAsyncapiMediaTranscriptions({
      asyncMediaTranscription: {
        mediaId,
        language,
        webhookUrl: process.env.TRANSCRIPTION_WEBHOOK_URL || 'https://your-server.com/webhooks/transcription'
      }
    });

    return {
      jobId: response.body.id,
      status: response.body.status,
      webhookUrl: response.body.webhookUrl
    };
  }

  static verifyWebhookCallback(req, res) {
    // Genesys Cloud signs webhooks with HMAC-SHA256. Verify signature before processing.
    const signature = req.headers['x-genesys-signature'] || '';
    const timestamp = req.headers['x-genesys-timestamp'] || '';
    
    // Implement HMAC verification logic here using your shared secret
    // if (!verifyHMAC(signature, timestamp, req.rawBody, secret)) {
    //   res.status(401).send('Unauthorized');
    //   return;
    // }

    const payload = JSON.parse(req.body);
    console.log('Transcription callback received:', JSON.stringify(payload, null, 2));
    res.status(200).send('Accepted');
  }
}

Step 4: Batch Metadata Sync, Metrics Tracking, and Audit Logging

Production systems require batch synchronization with external asset managers, cost tracking for capacity planning, and immutable audit trails. The following utilities accumulate operations, flush them in batches, calculate storage estimates, and log compliance events.

import winston from 'winston';

export class MetricsTracker {
  constructor() {
    this.successCount = 0;
    this.failureCount = 0;
    this.totalBytes = 0;
    this.costPerGB = 0.023; // Standard S3 storage rate
  }

  recordSuccess(bytes) {
    this.successCount++;
    this.totalBytes += bytes;
  }

  recordFailure() {
    this.failureCount++;
  }

  getStorageCostEstimate() {
    const gb = this.totalBytes / (1024 ** 3);
    return gb * this.costPerGB;
  }

  getSuccessRate() {
    const total = this.successCount + this.failureCount;
    return total === 0 ? 0 : (this.successCount / total) * 100;
  }
}

export class AuditLogger {
  constructor() {
    this.logger = winston.createLogger({
      level: 'info',
      format: winston.format.json(),
      transports: [new winston.transports.File({ filename: 'media-audit.log' })]
    });
  }

  log(action, details) {
    this.logger.info({
      timestamp: new Date().toISOString(),
      action,
      userId: process.env.GENESYS_USER_ID || 'system',
      details
    });
  }
}

export class ExternalSyncQueue {
  constructor(apiEndpoint) {
    this.endpoint = apiEndpoint;
    this.queue = [];
    this.BATCH_SIZE = 50;
  }

  add(mediaId, metadata) {
    this.queue.push({ mediaId, metadata, timestamp: Date.now() });
    if (this.queue.length >= this.BATCH_SIZE) {
      this.flush();
    }
  }

  async flush() {
    if (this.queue.length === 0) return;
    const batch = this.queue.splice(0, this.BATCH_SIZE);
    try {
      await fetch(this.endpoint, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ batch })
      });
      console.log(`Synced ${batch.length} metadata records to external system`);
    } catch (err) {
      console.error('External sync failed:', err.message);
      this.queue.unshift(...batch); // Requeue failed batch
    }
  }
}

Complete Working Example

The following module combines all components into a single governance manager. It handles authentication, validation, resumable upload, transcription triggers, batch sync, metrics, and audit logging. You can instantiate it and call uploadAndGovern to process files.

import { PureCloudPlatformClientV2 } from '@genesyscloud/purecloud-platform-client-v2';
import fs from 'fs';
import path from 'path';
import { v4 as uuidv4 } from 'uuid';
import winston from 'winston';

const GENESYS_DOMAIN = 'https://api.mypurecloud.com';

// --- Auth, Validator, Uploader, Transcription, Metrics, Audit, Sync classes from previous steps ---
// (Copy-paste the classes defined in Steps 1-4 here for a single-file module)

export class GenesysMediaManager {
  constructor(config) {
    this.auth = new GenesysAuth(config.clientId, config.clientSecret);
    this.platformClient = createPlatformClient(this.auth);
    this.uploader = new ResumableUploader(this.platformClient);
    this.transcriptionManager = new TranscriptionManager(this.platformClient);
    this.metrics = new MetricsTracker();
    this.audit = new AuditLogger();
    this.syncQueue = new ExternalSyncQueue(config.externalSyncUrl);
  }

  async uploadAndGovern(filePath, externalMetadata = {}) {
    const auditId = uuidv4();
    this.audit.log('UPLOAD_START', { auditId, filePath });

    try {
      // 1. Validate
      const validation = MediaValidator.validate(filePath);
      
      // 2. Upload with streaming chunks
      const uploadResult = await this.uploader.upload(filePath, {
        sourceSystem: 'asset-manager',
        auditId,
        ...externalMetadata
      });

      // 3. Retrieve media ID (poll or use webhook)
      // For demonstration, we query by filename after a short delay
      await new Promise(resolve => setTimeout(resolve, 2000));
      const mediaApi = this.platformClient.getMediaApi();
      const mediaList = await mediaApi.getMedia({
        size: 1,
        orderBy: 'createdAt',
        orderDir: 'desc',
        filter: `fileName eq '${validation.fileName}'`
      });

      if (!mediaList.body.entities || mediaList.body.entities.length === 0) {
        throw new Error('Media registration not found after upload');
      }

      const mediaId = mediaList.body.entities[0].id;
      this.metrics.recordSuccess(validation.size);
      this.audit.log('UPLOAD_SUCCESS', { auditId, mediaId, size: validation.size });

      // 4. Trigger transcription
      const transResult = await this.transcriptionManager.triggerTranscription(mediaId);
      this.audit.log('TRANSCRIPTION_TRIGGERED', { auditId, mediaId, jobId: transResult.jobId });

      // 5. Queue external sync
      this.syncQueue.add(mediaId, {
        ...externalMetadata,
        transcriptionJobId: transResult.jobId,
        uploadedAt: new Date().toISOString()
      });

      return {
        mediaId,
        transcriptionJobId: transResult.jobId,
        metrics: {
          successRate: this.metrics.getSuccessRate(),
          estimatedStorageCost: this.metrics.getStorageCostEstimate()
        }
      };
    } catch (error) {
      this.metrics.recordFailure();
      this.audit.log('UPLOAD_FAILURE', { auditId, error: error.message });
      throw error;
    }
  }

  async listMedia(page = 1, size = 25) {
    const mediaApi = this.platformClient.getMediaApi();
    let allMedia = [];
    let continuationToken = null;
    let currentPage = 1;

    do {
      const response = await mediaApi.getMedia({
        size,
        page: currentPage,
        orderBy: 'createdAt',
        orderDir: 'desc',
        continuationToken: continuationToken || undefined
      });

      allMedia = allMedia.concat(response.body.entities || []);
      continuationToken = response.body.continuationToken;
      currentPage++;
    } while (continuationToken && currentPage <= page);

    return allMedia;
  }
}

Common Errors & Debugging

Error: 401 Unauthorized

• Cause: OAuth token expired or client credentials are invalid.
• Fix: Verify client_id and client_secret match a configured OAuth client in Genesys Cloud. Ensure the token cache refreshes before expiration. The GenesysAuth class handles automatic refresh, but network timeouts during token exchange will surface as 401s. Wrap API calls in retry logic if transient authentication failures occur.

Error: 403 Forbidden

• Cause: Missing OAuth scopes or insufficient permissions for the service account.
• Fix: Confirm the OAuth client has media:write, media:read, media:transcribe, and asyncapi:write scopes assigned. Verify the service account is assigned to an organization role with media management privileges.

Error: 429 Too Many Requests

• Cause: Rate limiting triggered by rapid upload requests or transcription triggers.
• Fix: Implement exponential backoff. The following utility handles 429 responses automatically:

async function fetchWithRetry(url, options, maxRetries = 3) {
  for (let attempt = 0; attempt <= maxRetries; attempt++) {
    const response = await fetch(url, options);
    if (response.status === 429 && attempt < maxRetries) {
      const retryAfter = parseInt(response.headers.get('Retry-After') || '5', 10);
      console.log(`Rate limited. Retrying in ${retryAfter} seconds...`);
      await new Promise(resolve => setTimeout(resolve, retryAfter * 1000));
      continue;
    }
    return response;
  }
  throw new Error('Max retries exceeded for 429 response');
}

Error: 400 Bad Request (Invalid Format or Duration)

• Cause: File codec, sample rate, or duration exceeds Genesys Cloud limits.
• Fix: Ensure audio files use PCM/WAV, MP3, Opus, or AAC codecs. Verify duration does not exceed 30 minutes. Use ffprobe in a preprocessing pipeline to validate duration and channel configuration before streaming to the API.

Official References

• Media Upload API Documentation
• Async Transcription API Documentation
• Node.js SDK Reference
• OAuth 2.0 Client Credentials Flow