Building a Genesys Cloud AppFoundry Widget That Fetches CRM Data With JWT in React

What You Will Build

• A React-based AppFoundry iframe widget that extracts the current user JWT and queries Genesys Cloud interaction data to display CRM-synced contact records.
• This implementation uses the @genesys/cloud-appfoundry-sdk and standard REST calls with Bearer authentication.
• The tutorial covers TypeScript, React 18, and the Fetch API with production-grade retry and pagination logic.

Prerequisites

• Genesys Cloud AppFoundry SDK v2+ (@genesys/cloud-appfoundry-sdk)
• OAuth scopes: interaction:read, user:read
• Node.js 18+, React 18, TypeScript 5+
• Dependencies: @genesys/cloud-appfoundry-sdk, react, react-dom
• A registered AppFoundry widget in the Genesys Cloud admin console with the correct iframe URL and scope permissions

Authentication Setup

AppFoundry widgets run inside an iframe and receive the authenticated user context via postMessage. The SDK abstracts the handshake, but you must explicitly request the JWT before making API calls. The JWT is short-lived and rotates automatically. Your widget must handle token expiration gracefully by catching 401 responses and re-fetching the token.

import { AppFoundry } from '@genesys/cloud-appfoundry-sdk';

let appfoundry: AppFoundry;

export async function initializeAppFoundry(): Promise<AppFoundry> {
  if (!appfoundry) {
    appfoundry = new AppFoundry();
    await appfoundry.init();
  }
  return appfoundry;
}

export async function getValidJwt(): Promise<string> {
  const af = await initializeAppFoundry();
  const jwt = await af.getJwt();
  if (!jwt) {
    throw new Error('AppFoundry JWT is null. Check widget scope configuration.');
  }
  return jwt;
}

The init() method establishes the parent-child communication channel. Calling getJwt() returns the current bearer token. You do not need to implement OAuth2 token exchange manually. The Genesys Cloud platform injects the token into the iframe context. Store the token in memory only. Never persist it to localStorage or sessionStorage, as the iframe context resets on navigation and token rotation will invalidate cached values.

Implementation

Step 1: Build a Resilient Fetch Utility With Retry and Pagination

Genesys Cloud APIs enforce strict rate limits. A 429 Too Many Requests response includes a Retry-After header. Your fetch utility must parse this header, apply exponential backoff, and respect pagination cursors. The /api/v2/interactions endpoint returns a nextPage token when results exceed the page size.

export interface InteractionSummary {
  id: string;
  type: string;
  routing?: {
    queueId?: string;
    participantId?: string;
  };
  to: {
    address: string;
    name?: string;
  };
}

export interface PaginatedResponse<T> {
  entities: T[];
  pageSize: number;
  totalCount: number;
  nextPage?: string;
}

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

export async function fetchInteractionsWithPagination(
  jwt: string,
  pageSize: number = 25
): Promise<InteractionSummary[]> {
  let allInteractions: InteractionSummary[] = [];
  let nextPage: string | undefined = undefined;
  let retryCount = 0;
  const maxRetries = 3;

  do {
    const url = new URL('/api/v2/interactions', BASE_URL);
    url.searchParams.set('pageSize', pageSize.toString());
    if (nextPage) {
      url.searchParams.set('nextPage', nextPage);
    }

    let response: Response;
    try {
      response = await fetch(url.toString(), {
        method: 'GET',
        headers: {
          'Authorization': `Bearer ${jwt}`,
          'Accept': 'application/json',
          'Content-Type': 'application/json'
        }
      });
    } catch (networkError) {
      throw new Error(`Network failure during interaction fetch: ${(networkError as Error).message}`);
    }

    if (response.status === 429) {
      const retryAfter = response.headers.get('Retry-After');
      const waitTime = retryAfter ? parseInt(retryAfter, 10) * 1000 : Math.pow(2, retryCount) * 1000;
      retryCount++;
      if (retryCount > maxRetries) {
        throw new Error('Rate limit exceeded after maximum retries.');
      }
      await new Promise(resolve => setTimeout(resolve, waitTime));
      continue;
    }

    if (response.status === 401) {
      throw new Error('JWT expired or invalid. Refresh token required.');
    }

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

    const data: PaginatedResponse<InteractionSummary> = await response.json();
    allInteractions = [...allInteractions, ...data.entities];
    nextPage = data.nextPage;
    retryCount = 0; // Reset retry counter on successful page fetch
  } while (nextPage);

  return allInteractions;
}

This utility handles the complete request lifecycle. It constructs the query string with pageSize and nextPage, applies the Bearer header, catches 429 responses, parses Retry-After, and loops until pagination completes. The 401 check triggers a token refresh flow in the calling component. The 5xx and 4xx paths throw descriptive errors that the React component can catch.

Step 2: Integrate JWT Extraction and Data Fetching in React

React components must manage async initialization carefully. You cannot call appfoundry.getJwt() during render. Use useEffect to trigger initialization, fetch the token, and load data. Implement a retry mechanism for 401 responses by re-fetching the JWT automatically.

import { useState, useEffect, useCallback } from 'react';
import { initializeAppFoundry, getValidJwt } from './auth';
import { fetchInteractionsWithPagination, InteractionSummary } from './api';

export function useCrmData() {
  const [interactions, setInteractions] = useState<InteractionSummary[]>([]);
  const [loading, setLoading] = useState<boolean>(true);
  const [error, setError] = useState<string | null>(null);

  const loadData = useCallback(async (attempt: number = 1) => {
    try {
      setLoading(true);
      setError(null);
      const jwt = await getValidJwt();
      const data = await fetchInteractionsWithPagination(jwt);
      setInteractions(data);
    } catch (err) {
      const message = err instanceof Error ? err.message : 'Unknown error occurred';
      if (message.includes('JWT expired') && attempt < 2) {
        // Token rotation detected. Retry once with a fresh JWT.
        await loadData(attempt + 1);
      } else {
        setError(message);
      }
    } finally {
      setLoading(false);
    }
  }, []);

  useEffect(() => {
    loadData();
  }, [loadData]);

  return { interactions, loading, error, refresh: () => loadData(1) };
}

The custom hook encapsulates the data lifecycle. It initializes the SDK, extracts the JWT, calls the pagination utility, and updates React state. The attempt parameter enables automatic token refresh on 401 without blocking the UI indefinitely. The refresh function exposes a manual reload trigger for the UI.

Step 3: Render CRM Data With Proper Error Boundaries

Display the fetched interactions in a deterministic list. Handle loading states, empty results, and error boundaries. Genesys Cloud interaction data contains routing metadata and contact addresses. Map these fields to a readable CRM card format.

export function CrmDataWidget() {
  const { interactions, loading, error, refresh } = useCrmData();

  if (loading) {
    return <div className="widget-loading">Loading CRM data...</div>;
  }

  if (error) {
    return (
      <div className="widget-error">
        <p>Failed to load data: {error}</p>
        <button onClick={refresh}>Retry</button>
      </div>
    );
  }

  if (interactions.length === 0) {
    return <div className="widget-empty">No recent interactions found.</div>;
  }

  return (
    <div className="crm-widget-container">
      <h3>Recent CRM Interactions</h3>
      <ul className="interaction-list">
        {interactions.map(interaction => (
          <li key={interaction.id} className="interaction-card">
            <span className="contact-name">
              {interaction.to.name || interaction.to.address}
            </span>
            <span className="interaction-type">{interaction.type}</span>
            {interaction.routing?.queueId && (
              <span className="queue-id">Queue: {interaction.routing.queueId}</span>
            )}
          </li>
        ))}
      </ul>
    </div>
  );
}

This component renders a clean list of interactions. It checks loading, error, and empty states before mapping data. The key prop uses interaction.id to ensure React reconciliation stability. The UI delegates retry logic to the hook, keeping the render path pure.

Complete Working Example

Combine the authentication module, API utility, and React component into a single deployable widget entry point. This file is ready to compile with Vite or Webpack and deploy to an AppFoundry iframe.

import React from 'react';
import ReactDOM from 'react-dom/client';
import { AppFoundry } from '@genesys/cloud-appfoundry-sdk';

// Authentication Module
let appfoundry: AppFoundry;

async function initializeAppFoundry(): Promise<AppFoundry> {
  if (!appfoundry) {
    appfoundry = new AppFoundry();
    await appfoundry.init();
  }
  return appfoundry;
}

async function getValidJwt(): Promise<string> {
  const af = await initializeAppFoundry();
  const jwt = await af.getJwt();
  if (!jwt) throw new Error('AppFoundry JWT is null. Verify widget scopes.');
  return jwt;
}

// API Module
const BASE_URL = 'https://api.mypurecloud.com';

interface InteractionSummary {
  id: string;
  type: string;
  routing?: { queueId?: string; participantId?: string };
  to: { address: string; name?: string };
}

interface PaginatedResponse<T> {
  entities: T[];
  pageSize: number;
  totalCount: number;
  nextPage?: string;
}

async function fetchInteractionsWithPagination(jwt: string, pageSize: number = 25): Promise<InteractionSummary[]> {
  let allInteractions: InteractionSummary[] = [];
  let nextPage: string | undefined = undefined;
  let retryCount = 0;
  const maxRetries = 3;

  do {
    const url = new URL('/api/v2/interactions', BASE_URL);
    url.searchParams.set('pageSize', pageSize.toString());
    if (nextPage) url.searchParams.set('nextPage', nextPage);

    let response: Response;
    try {
      response = await fetch(url.toString(), {
        method: 'GET',
        headers: { 'Authorization': `Bearer ${jwt}`, 'Accept': 'application/json' }
      });
    } catch (err) {
      throw new Error(`Network failure: ${(err as Error).message}`);
    }

    if (response.status === 429) {
      const retryAfter = response.headers.get('Retry-After');
      const waitTime = retryAfter ? parseInt(retryAfter, 10) * 1000 : Math.pow(2, retryCount) * 1000;
      retryCount++;
      if (retryCount > maxRetries) throw new Error('Rate limit exceeded.');
      await new Promise(resolve => setTimeout(resolve, waitTime));
      continue;
    }

    if (response.status === 401) throw new Error('JWT expired.');
    if (!response.ok) throw new Error(`HTTP ${response.status}: ${await response.text()}`);

    const data: PaginatedResponse<InteractionSummary> = await response.json();
    allInteractions = [...allInteractions, ...data.entities];
    nextPage = data.nextPage;
    retryCount = 0;
  } while (nextPage);

  return allInteractions;
}

// React Hook
function useCrmData() {
  const [interactions, setInteractions] = React.useState<InteractionSummary[]>([]);
  const [loading, setLoading] = React.useState<boolean>(true);
  const [error, setError] = React.useState<string | null>(null);

  const loadData = React.useCallback(async (attempt: number = 1) => {
    try {
      setLoading(true);
      setError(null);
      const jwt = await getValidJwt();
      const data = await fetchInteractionsWithPagination(jwt);
      setInteractions(data);
    } catch (err) {
      const message = err instanceof Error ? err.message : 'Unknown error';
      if (message.includes('JWT expired') && attempt < 2) {
        await loadData(attempt + 1);
      } else {
        setError(message);
      }
    } finally {
      setLoading(false);
    }
  }, []);

  React.useEffect(() => { loadData(); }, [loadData]);
  return { interactions, loading, error, refresh: () => loadData(1) };
}

// UI Component
function CrmDataWidget() {
  const { interactions, loading, error, refresh } = useCrmData();

  if (loading) return <div>Loading CRM data...</div>;
  if (error) return <div><p>Error: {error}</p><button onClick={refresh}>Retry</button></div>;
  if (interactions.length === 0) return <div>No recent interactions.</div>;

  return (
    <div>
      <h3>Recent CRM Interactions</h3>
      <ul>
        {interactions.map(i => (
          <li key={i.id}>
            {i.to.name || i.to.address} | {i.type}
            {i.routing?.queueId ? ` | Queue: ${i.routing.queueId}` : ''}
          </li>
        ))}
      </ul>
    </div>
  );
}

// Entry Point
ReactDOM.createRoot(document.getElementById('root')!).render(
  <React.StrictMode>
    <CrmDataWidget />
  </React.StrictMode>
);

This file contains the complete widget lifecycle. It initializes the SDK, handles JWT extraction, fetches paginated data with 429 retry logic, maps errors to UI states, and renders the contact list. Replace https://api.mypurecloud.com with your environment base URL if using a different region. Deploy the compiled bundle to a static host and configure the AppFoundry widget URL in the Genesys Cloud admin console.

Common Errors & Debugging

Error: 401 Unauthorized

• Cause: The JWT expired during a long-running pagination loop or the widget lost iframe context.
• Fix: Catch the 401 status, call appfoundry.getJwt() again, and retry the request. The provided hook implements a single automatic retry on JWT expiration.
• Code Fix: Already implemented in useCrmData with the attempt parameter. Ensure you do not cache JWTs across component mounts.

Error: 403 Forbidden

• Cause: The AppFoundry widget configuration lacks the interaction:read scope, or the authenticated user lacks permission to view interactions.
• Fix: Navigate to the Genesys Cloud admin console, open the AppFoundry widget settings, and add interaction:read to the required scopes. Verify the user role includes interaction visibility.
• Code Fix: No code change required. The error message from the API will explicitly state missing scope. Log response.headers.get('WWW-Authenticate') for detailed scope requirements.

Error: 429 Too Many Requests

• Cause: The widget exceeds the endpoint rate limit. Genesys Cloud enforces per-user and per-tenant limits.
• Fix: Implement exponential backoff with jitter. Parse the Retry-After header. The utility function already handles this.
• Code Fix: Verify the Retry-After header parsing logic. If the header is missing, fallback to Math.pow(2, retryCount) * 1000. Never retry synchronously in a tight loop.

Error: AppFoundry SDK init fails or JWT is null

• Cause: The widget is not loaded inside the Genesys Cloud iframe, or the parent window did not send the handshake message.
• Fix: Ensure the widget URL is registered in AppFoundry. Do not test the bundle directly in a browser tab. Use the Genesys Cloud preview mode or embed it in a test widget.
• Code Fix: Add a timeout to appfoundry.init() and throw a descriptive error if the handshake does not complete within 5 seconds.

Official References

• Genesys Cloud AppFoundry SDK Documentation
• Interactions API Reference
• JWT Authentication Guide
• AppFoundry Widget Configuration