API Architecture

Building Scalable Microservices with Node.js

System Architecture

API Gateway

Single entry point for all client requests with authentication, rate limiting, and routing

Microservices

Independent services for user management, payments, notifications, and analytics

Database Layer

PostgreSQL for transactional data, Redis for caching, Elasticsearch for search

Implementation Example

// Express.js API route with middleware
const express = require('express');
const app = express();

// Authentication middleware
const authenticate = async (req, res, next) => {
  try {
    const token = req.headers.authorization;
    const user = await verifyToken(token);
    req.user = user;
    next();
  } catch (error) {
    res.status(401).json({ error: 'Unauthorized' });
  }
};

// Protected route
app.get('/api/users', authenticate, async (req, res) => {
  const users = await getUsersFromDB();
  res.json(users);
});
        

Performance Metrics

99.9%

Uptime

50ms

Avg Response Time

10K

RPS Capacity

0.01%

Error Rate

Request Flow Diagram

Client

→

API Gateway

→

Microservice

→

Database