Heldinhow Go API Development
Overview
Go is excellent for building high-performance APIs. Its concurrency model, fast compilation, and simple deployment make it ideal for microservices and REST APIs.
Process
1. Project Setup
mkdir myapi && cd myapi
go mod init github.com/username/myapi
# Choose router: chi, gin, fiber, or stdlib
go get github.com/go-chi/chi/v5
2. Structure
├── cmd/
│ └── api/main.go
├── internal/
│ ├── handlers/
│ ├── models/
│ └── repository/
├── go.mod
└── go.sum
3. Handlers
func GetUsers(w http.ResponseWriter, r *http.Request) {
users, err := repository.GetAll()
if err != nil {
http.Error(w, err.Error(), 500)
return
}
json.NewEncoder(w).Encode(users)
}
4. Middleware
- Logging (zerolog, zap)
- Authentication (JWT, OAuth)
- Rate limiting
- CORS
5. Database
- Use GORM, sqlx, or raw SQL
- Implement repository pattern
- Connection pooling built-in
Examples
- REST API: CRUD with chi router
- Microservice: gRPC + HTTP gateway
- Auth Service: JWT + Redis sessions
Limitations
- Learning curve for goroutines/channels
- Error handling verbose without helpers
- Dependency management requires discipline
- Not as expressive as Python/Ruby for quick prototyping