fiber

fiber

Express-inspired Go framework built on fasthttp for zero-allocation performance.

Core Concepts

• Express-like API: familiar syntax with app.Get(), app.Post(), route parameters and query strings
• Middleware: app.Use() for global middleware, app.Group().Use() for scoped chains
• Static files: app.Static("/", "./public") for directory serving with caching headers
• Fiber client: built-in HTTP client with client.Get() for outbound requests and retries

Common Patterns

• WebSocket: app.Get("/ws", websocket.New(func(c *websocket.Conn) {})) for real-time connections
• Validation: validate := validator.New() with struct tags for request body validation
• Error handling: custom ErrorHandler in app.Config for centralized error response formatting
• Testing: app.Test() method sends requests directly without external server process

Best Practices

• Use fiber.Map for JSON response construction instead of anonymous structs in handlers
• Initialize validator globally and use validate.Struct() for consistent validation
• Group routes by domain with app.Group("/api/v1") and dedicated middleware per group
• Configure Prefork: true for multi-CPU scaling in production deployments behind a load balancer

Common Code Patterns

• app.Get("/user/:id", func(c *fiber.Ctx) error { return c.JSON(fiber.Map{"id": c.Params("id")}) })
• app.Use(logger.New()) for request logging, app.Use(recover.New()) for panic recovery