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Building High-Throughput Scalable APIs in Node.js & Go

Architectural patterns, rate-limiting strategies, and database pooling to handle millions of requests.

P
Prashant Sharan

Architectural Blueprint for Modern APIs

When designing modern cloud APIs, balancing throughput, latency, and fault tolerance is paramount. In this article, we’ll explore key patterns for building scalable API services.

ℹ️ Pro Tip

Always decouple write-heavy workloads from read paths using event-driven message queues like Kafka or Redis Streams.

1. Connection Pooling & Database Optimization

Database queries are frequently the bottleneck in API backends. Always utilize connection pools and indexes.

// Connection pool setup in TypeScript
import { Pool } from 'pg';

export const dbPool = new Pool({
  max: 20,
  idleTimeoutMillis: 30000,
  connectionTimeoutMillis: 2000,
});

2. Rate Limiting Strategy

Implement token-bucket or sliding-window rate limiting at the API gateway layer to prevent resource exhaustion.

// Example rate limiter middleware in Go
package main

import (
	"net/http"
	"golang.org/x/time/rate"
)

func rateLimitMiddleware(limiter *rate.Limiter, next http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		if !limiter.Allow() {
			http.Error(w, "Too Many Requests", http.StatusTooManyRequests)
			return
		}
		next(w, r)
	}
}
⚠️ Security Requirement

Never expose internal stack traces in HTTP 500 error payloads. Use structured loggers (e.g. Pino or Zap) for internal observability.

Conclusion

Building scalable APIs requires continuous profiling, smart caching, and defensive middleware architecture.

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