Better Auth Apso Adapter

A production-ready database adapter for Better Auth that seamlessly interfaces with Apso-generated CRUD REST endpoints. This adapter enables Better Auth to work with any REST API following Apso/nestjsx/crud conventions, providing enterprise-grade authentication for modern applications.

Key Features

• 🔒 Complete Better Auth Integration - Full compliance with Better Auth adapter interface
• 🚀 Production-Ready - Built-in retry logic, circuit breakers, and connection pooling
• ⚡ High Performance - Optimized for speed with caching and batch operations
• 🔧 TypeScript First - Comprehensive type definitions and strict type checking
• 📧 Email Normalization - Automatic email processing and validation
• 🏗️ Multi-Tenant Support - Built-in multi-tenancy with scope isolation
• 📊 Observability - Comprehensive metrics, tracing, and logging
• 🛡️ Security Focused - Input validation, sanitization, and secure defaults
• 🔄 Flexible Configuration - Extensive customization options
• 📈 Scalable - Connection pooling and bulk operations for high throughput

Installation

npm install @apso/better-auth-adapter

yarn add @apso/better-auth-adapter

pnpm add @apso/better-auth-adapter

Quick Start

import { betterAuth } from 'better-auth';
import { apsoAdapter } from '@apso/better-auth-adapter';

export const auth = betterAuth({
  database: apsoAdapter({
    baseUrl: process.env.APSO_BASE_URL!,
    apiKey: process.env.APSO_API_KEY,
  }),
  emailAndPassword: {
    enabled: true,
  },
  session: {
    expiresIn: 60 * 60 * 24 * 7, // 7 days
  },
});

Environment Variables

Create a .env.local file in your project root:

APSO_BASE_URL=https://your-apso-api.com
APSO_API_KEY=your-secret-api-key

Advanced Configuration

Production Setup

import { apsoAdapter } from '@apso/better-auth-adapter';

const adapter = apsoAdapter({
  baseUrl: process.env.APSO_BASE_URL!,
  apiKey: process.env.APSO_API_KEY,
  
  // Retry configuration for resilience
  retryConfig: {
    maxRetries: 3,
    initialDelayMs: 1000,
    maxDelayMs: 10000,
    retryableStatuses: [429, 500, 502, 503, 504],
  },
  
  // Performance optimization
  cacheConfig: {
    enabled: true,
    ttlMs: 300000, // 5 minutes
    maxSize: 1000,
  },
  
  // Batch operations
  batchConfig: {
    batchSize: 100,
    concurrency: 5,
    delayBetweenBatches: 100,
  },
  
  // Request timeout
  timeout: 30000, // 30 seconds
  
  // Email normalization
  emailNormalization: true,
  
  // Observability
  observability: {
    metricsEnabled: true,
    tracingEnabled: true,
    logLevel: 'info',
  },
});

Multi-Tenant Configuration

const adapter = apsoAdapter({
  baseUrl: process.env.APSO_BASE_URL!,
  apiKey: process.env.APSO_API_KEY,
  
  multiTenancy: {
    enabled: true,
    scopeField: 'tenantId',
    getScopeValue: async () => {
      // Get tenant ID from context, headers, etc.
      return getCurrentTenantId();
    },
  },
});

High-Throughput Setup

import { createHighThroughputApsoAdapter } from '@apso/better-auth-adapter';

const adapter = createHighThroughputApsoAdapter({
  baseUrl: process.env.APSO_BASE_URL!,
  apiKey: process.env.APSO_API_KEY,
  
  // Optimized for high volume
  batchConfig: {
    batchSize: 500,
    concurrency: 10,
  },
  
  // Connection pooling
  fetchImpl: new HttpClient({
    connectionPool: {
      maxConnections: 100,
      maxConnectionsPerHost: 20,
      keepAlive: true,
    },
  }),
});

Framework Integration

Next.js App Router

// app/lib/auth.ts
import { betterAuth } from 'better-auth';
import { apsoAdapter } from '@apso/better-auth-adapter';

export const auth = betterAuth({
  database: apsoAdapter({
    baseUrl: process.env.APSO_BASE_URL!,
    apiKey: process.env.APSO_API_KEY,
  }),
  emailAndPassword: {
    enabled: true,
  },
  trustedOrigins: [process.env.NEXT_PUBLIC_APP_URL!],
});

// app/api/auth/[...auth]/route.ts
import { auth } from '@/lib/auth';

export const { GET, POST } = auth.handler;

Express.js

// server.ts
import express from 'express';
import { betterAuth } from 'better-auth';
import { apsoAdapter } from '@apso/better-auth-adapter';

const app = express();

const auth = betterAuth({
  database: apsoAdapter({
    baseUrl: process.env.APSO_BASE_URL!,
    apiKey: process.env.APSO_API_KEY,
  }),
  emailAndPassword: {
    enabled: true,
  },
});

app.use('/api/auth/*', auth.handler);

API Reference

apsoAdapter(config: ApsoAdapterConfig)

Creates a Better Auth adapter that interfaces with Apso CRUD APIs.

Parameters

Parameter	Type	Required	Description
baseUrl	string	✅	Base URL of your Apso API
apiKey	string	❌	API key for authentication
timeout	number	❌	Request timeout in milliseconds (default: 10000)
retryConfig	RetryConfig	❌	Retry configuration for failed requests
cacheConfig	CacheConfig	❌	Response caching configuration
batchConfig	BatchConfig	❌	Batch operations configuration
multiTenancy	MultiTenancyConfig	❌	Multi-tenancy settings
observability	ObservabilityConfig	❌	Metrics and tracing configuration
emailNormalization	boolean	❌	Enable email normalization (default: true)
debugMode	boolean	❌	Enable debug logging (default: false)

Specialized Adapters

// Reliable adapter with enhanced retry logic
const reliableAdapter = createReliableApsoAdapter(config);

// High-throughput adapter optimized for performance
const fastAdapter = createHighThroughputApsoAdapter(config);

Health Monitoring

// Check adapter health
const isHealthy = await checkAdapterHealth(adapter);

// Get adapter metrics
const metrics = adapter.getMetrics();
console.log(`Success rate: ${metrics.successfulRequests / metrics.totalRequests * 100}%`);

// Close all adapters (useful for graceful shutdown)
await closeAllAdapters();

Authentication Flows

Email/Password Sign Up

import { auth } from './lib/auth';

// Sign up new user
const result = await auth.api.signUpEmail({
  body: {
    email: 'user@example.com',
    password: 'securePassword123',
    name: 'John Doe',
  },
});

if (result.data?.user) {
  console.log('User created:', result.data.user.id);
}

Email/Password Sign In

// Sign in user
const result = await auth.api.signInEmail({
  body: {
    email: 'user@example.com',
    password: 'securePassword123',
  },
});

if (result.data?.session) {
  console.log('Session created:', result.data.session.token);
}

Password Reset Flow

// Request password reset
await auth.api.forgetPassword({
  body: {
    email: 'user@example.com',
    redirectTo: 'https://yourdomain.com/reset-password',
  },
});

// Reset password with token
await auth.api.resetPassword({
  body: {
    token: 'reset-token',
    password: 'newSecurePassword123',
  },
});

Error Handling

The adapter provides comprehensive error handling with specific error codes:

import { AdapterError, AdapterErrorCode } from '@apso/better-auth-adapter';

try {
  await auth.api.signInEmail({
    body: { email: 'invalid', password: 'wrong' }
  });
} catch (error) {
  if (error instanceof AdapterError) {
    switch (error.code) {
      case AdapterErrorCode.VALIDATION_ERROR:
        console.error('Invalid input:', error.details);
        break;
      case AdapterErrorCode.NOT_FOUND:
        console.error('User not found');
        break;
      case AdapterErrorCode.UNAUTHORIZED:
        console.error('Invalid credentials');
        break;
      case AdapterErrorCode.RATE_LIMIT:
        console.error('Too many requests, retry after:', error.details.retryAfter);
        break;
      default:
        console.error('Unexpected error:', error.message);
    }
  }
}

Performance Optimization

Caching Strategy

const adapter = apsoAdapter({
  baseUrl: process.env.APSO_BASE_URL!,
  cacheConfig: {
    enabled: true,
    ttlMs: 600000, // 10 minutes
    maxSize: 2000,
  },
});

// Clear cache when needed
adapter.clearCache();

Batch Operations

// Batch create users
const users = await adapter.createMany({
  model: 'user',
  data: [
    { email: 'user1@example.com', name: 'User 1' },
    { email: 'user2@example.com', name: 'User 2' },
    { email: 'user3@example.com', name: 'User 3' },
  ],
});

Connection Pooling

import { HttpClient } from '@apso/better-auth-adapter';

const httpClient = new HttpClient({
  connectionPool: {
    maxConnections: 50,
    maxConnectionsPerHost: 10,
    keepAlive: true,
    keepAliveTimeout: 30000,
  },
});

const adapter = apsoAdapter({
  baseUrl: process.env.APSO_BASE_URL!,
  fetchImpl: httpClient,
});

Security Best Practices

Environment Variables

Never hardcode sensitive values. Always use environment variables:

// ✅ Good
const adapter = apsoAdapter({
  baseUrl: process.env.APSO_BASE_URL!,
  apiKey: process.env.APSO_API_KEY,
});

// ❌ Bad
const adapter = apsoAdapter({
  baseUrl: 'https://api.example.com',
  apiKey: 'secret-key-123',
});

Input Validation

The adapter automatically validates and sanitizes all inputs:

// Email normalization is enabled by default
const adapter = apsoAdapter({
  baseUrl: process.env.APSO_BASE_URL!,
  emailNormalization: true, // Converts emails to lowercase, trims whitespace
});

HTTPS Only

Always use HTTPS endpoints in production:

// ✅ Good
const adapter = apsoAdapter({
  baseUrl: 'https://api.example.com',
});

// ❌ Bad (HTTP in production)
const adapter = apsoAdapter({
  baseUrl: 'http://api.example.com',
});

Monitoring and Observability

Metrics Collection

const adapter = apsoAdapter({
  baseUrl: process.env.APSO_BASE_URL!,
  observability: {
    metricsEnabled: true,
    tracingEnabled: true,
    logLevel: 'info',
  },
});

// Get detailed metrics
const metrics = adapter.getMetrics();
console.log({
  totalRequests: metrics.totalRequests,
  successRate: metrics.successfulRequests / metrics.totalRequests,
  averageLatency: metrics.averageLatency,
  p95Latency: metrics.p95Latency,
  cacheHitRate: metrics.cacheHitRate,
});

Custom Logger

import { Logger } from '@apso/better-auth-adapter';

const customLogger: Logger = {
  debug: (message, meta) => console.debug(message, meta),
  info: (message, meta) => console.info(message, meta),
  warn: (message, meta) => console.warn(message, meta),
  error: (message, meta) => console.error(message, meta),
};

const adapter = apsoAdapter({
  baseUrl: process.env.APSO_BASE_URL!,
  logger: customLogger,
});

Migration Guide

See our comprehensive Migration Guide for detailed instructions on:

• Migrating from AWS Cognito
• Migrating from Prisma adapter
• Migrating from Drizzle adapter
• Data export and import procedures

Troubleshooting

Common issues and solutions can be found in our Troubleshooting Guide.

Quick Fixes

Connection timeout errors:

const adapter = apsoAdapter({
  baseUrl: process.env.APSO_BASE_URL!,
  timeout: 30000, // Increase timeout to 30 seconds
});

Rate limiting issues:

const adapter = apsoAdapter({
  baseUrl: process.env.APSO_BASE_URL!,
  retryConfig: {
    maxRetries: 5,
    initialDelayMs: 2000,
    maxDelayMs: 30000,
  },
});

Examples

For complete working examples, see:

• Next.js App Router Example
• Next.js Pages Router Example
• Express.js Example
• Multi-tenant Application
• High-Performance Setup

Contributing

We welcome contributions! Please see our Contributing Guide for details on:

• Setting up the development environment
• Running tests and code quality checks
• Submitting pull requests
• Code style guidelines

Changelog

See CHANGELOG.md for a detailed history of changes.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Support

• Documentation: Full API Reference
• Configuration: Configuration Guide
• Examples: Usage Examples
• Issues: GitHub Issues
• Discussions: GitHub Discussions

Related Projects

• Better Auth - Modern authentication library
• Apso SDK - TypeScript SDK for Apso APIs
• nestjsx/crud - CRUD operations for NestJS applications

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