Vercel Reference Architecture

Overview

Production-ready architecture patterns for Vercel integrations.

Prerequisites

• Understanding of layered architecture
• Vercel SDK knowledge
• TypeScript project setup
• Testing framework configured

Project Structure

my-vercel-project/
├── src/
│   ├── vercel/
│   │   ├── client.ts           # Singleton client wrapper
│   │   ├── config.ts           # Environment configuration
│   │   ├── types.ts            # TypeScript types
│   │   ├── errors.ts           # Custom error classes
│   │   └── handlers/
│   │       ├── webhooks.ts     # Webhook handlers
│   │       └── events.ts       # Event processing
│   ├── services/
│   │   └── vercel/
│   │       ├── index.ts        # Service facade
│   │       ├── sync.ts         # Data synchronization
│   │       └── cache.ts        # Caching layer
│   ├── api/
│   │   └── vercel/
│   │       └── webhook.ts      # Webhook endpoint
│   └── jobs/
│       └── vercel/
│           └── sync.ts         # Background sync job
├── tests/
│   ├── unit/
│   │   └── vercel/
│   └── integration/
│       └── vercel/
├── config/
│   ├── vercel.development.json
│   ├── vercel.staging.json
│   └── vercel.production.json
└── docs/
    └── vercel/
        ├── SETUP.md
        └── RUNBOOK.md

Layer Architecture

┌─────────────────────────────────────────┐
│             API Layer                    │
│   (Controllers, Routes, Webhooks)        │
├─────────────────────────────────────────┤
│           Service Layer                  │
│  (Business Logic, Orchestration)         │
├─────────────────────────────────────────┤
│          Vercel Layer        │
│   (Client, Types, Error Handling)        │
├─────────────────────────────────────────┤
│         Infrastructure Layer             │
│    (Cache, Queue, Monitoring)            │
└─────────────────────────────────────────┘

Key Components

Step 1: Client Wrapper

// src/vercel/client.ts
export class VercelService {
  private client: VercelClient;
  private cache: Cache;
  private monitor: Monitor;

  constructor(config: VercelConfig) {
    this.client = new VercelClient(config);
    this.cache = new Cache(config.cacheOptions);
    this.monitor = new Monitor('vercel');
  }

  async get(id: string): Promise<Resource> {
    return this.cache.getOrFetch(id, () =>
      this.monitor.track('get', () => this.client.get(id))
    );
  }
}

Step 2: Error Boundary

// src/vercel/errors.ts
export class VercelServiceError extends Error {
  constructor(
    message: string,
    public readonly code: string,
    public readonly retryable: boolean,
    public readonly originalError?: Error
  ) {
    super(message);
    this.name = 'VercelServiceError';
  }
}

export function wrapVercelError(error: unknown): VercelServiceError {
  // Transform SDK errors to application errors
}

Step 3: Health Check

// src/vercel/health.ts
export async function checkVercelHealth(): Promise<HealthStatus> {
  try {
    const start = Date.now();
    await vercelClient.ping();
    return {
      status: 'healthy',
      latencyMs: Date.now() - start,
    };
  } catch (error) {
    return { status: 'unhealthy', error: error.message };
  }
}

Data Flow Diagram

User Request
     │
     ▼
┌─────────────┐
│   API       │
│   Gateway   │
└──────┬──────┘
       │
       ▼
┌─────────────┐    ┌─────────────┐
│   Service   │───▶│   Cache     │
│   Layer     │    │   (Redis)   │
└──────┬──────┘    └─────────────┘
       │
       ▼
┌─────────────┐
│ Vercel    │
│   Client    │
└──────┬──────┘
       │
       ▼
┌─────────────┐
│ Vercel    │
│   API       │
└─────────────┘

Configuration Management

// config/vercel.ts
export interface VercelConfig {
  apiKey: string;
  environment: 'development' | 'staging' | 'production';
  timeout: number;
  retries: number;
  cache: {
    enabled: boolean;
    ttlSeconds: number;
  };
}

export function loadVercelConfig(): VercelConfig {
  const env = process.env.NODE_ENV || 'development';
  return require(`./vercel.${env}.json`);
}

Instructions

Step 1: Create Directory Structure

Set up the project layout following the reference structure above.

Step 2: Implement Client Wrapper

Create the singleton client with caching and monitoring.

Step 3: Add Error Handling

Implement custom error classes for Vercel operations.

Step 4: Configure Health Checks

Add health check endpoint for Vercel connectivity.

Output

• Structured project layout
• Client wrapper with caching
• Error boundary implemented
• Health checks configured

Error Handling

Issue	Cause	Solution
Circular dependencies	Wrong layering	Separate concerns by layer
Config not loading	Wrong paths	Verify config file locations
Type errors	Missing types	Add Vercel types
Test isolation	Shared state	Use dependency injection

Examples

Quick Setup Script

# Create reference structure
mkdir -p src/vercel/{handlers} src/services/vercel src/api/vercel
touch src/vercel/{client,config,types,errors}.ts
touch src/services/vercel/{index,sync,cache}.ts

Resources

• Vercel SDK Documentation
• Vercel Best Practices

Flagship Skills

For multi-environment setup, see vercel-multi-env-setup.