Building Modern Go APIs

About This Book

Modern backend engineering is not just about writing handlers that return JSON. It is about making sound decisions around structure, data access, authentication, performance, and long-term maintainability.

Building Modern Go APIs is written for developers who want to move beyond toy examples and build services that feel production-ready from day one.

Who Is This For?

• Go developers building APIs for products or SaaS platforms
• Backend engineers moving from Node, PHP, or Python to Go
• Freelancers and founders who want dependable service architecture
• Students looking for a practical backend roadmap

What You’ll Learn

By the end of this ebook, you will be able to:

• Structure a Go API project for maintainability
• Build REST endpoints with validation and middleware
• Integrate PostgreSQL cleanly using repository patterns
• Add authentication and secure protected routes
• Improve performance with caching and job processing
• Add observability, metrics, and deployment workflows

Free Preview — Chapter 1

Every successful API begins with clear boundaries: resources, request flow, validation, error handling, and predictable responses. If those foundations are shaky, no amount of scaling magic will save the system later.

In Go, that means embracing explicitness. Handlers should be thin, business logic should live in well-defined services, and storage concerns should stay behind interfaces that can evolve without infecting the rest of the codebase.

func healthHandler(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Content-Type", "application/json")
    w.WriteHeader(http.StatusOK)
    _, _ = w.Write([]byte(`{"status":"ok"}`))
}

That tiny handler is not interesting on its own. What matters is the discipline around everything surrounding it: versioning, logging, testing, tracing, retries, and failure handling.

Purchase the full ebook to unlock architecture walkthroughs, production checklists, deployment templates, and real backend patterns.