HTTP Servers, REST APIs, Routing, Middleware, and JSON Services in Go
Build real web backends in Go using the HTTP standard library and common server-side design patterns.
Inside this chapter
- Why Go Is Strong for APIs
- Basic HTTP Handler
- JSON API Responses
- Middleware Thinking
- Business Example
Series navigation
Study the chapters in order for the clearest path from Golang basics to advanced concurrency, service design, and production engineering. Use the navigation at the bottom to move smoothly through the full tutorial series.
Why Go Is Strong for APIs
Go’s standard library makes it straightforward to build HTTP services without huge frameworks. This is one reason Go is often chosen for cloud services, backend APIs, and internal tooling.
Basic HTTP Handler
http.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte("ok"))
})This introduces the handler model at the heart of Go web servers. Handlers read request data and write responses explicitly.
JSON API Responses
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(map[string]string{"status": "ok"})Go APIs frequently return JSON for frontend, mobile, and service-to-service clients.
Middleware Thinking
Authentication checks, logging, tracing, request IDs, panic recovery, and rate limiting are often applied as middleware or wrapper layers around handlers. This keeps core business handlers cleaner.
Business Example
An internal operations platform might expose handlers for incidents, alerts, and status dashboards. Middleware can attach authentication and request logging while handlers focus on business logic and JSON responses.