A radix-tree router with no allocations on the hot path and less overhead than large frameworks. Go itself also handles networking quickly.

How does middleware work in Gin?

It is a gin.HandlerFunc run before or after the handler. c.Next() passes control on, c.Abort() stops the chain.

How do you validate input JSON?

Describe a struct with binding:"required" tags and call c.ShouldBindJSON(&dto). A validation failure comes back as an error.

Gin is a thin layer over net/http with a fast radix-tree router. It adds route groups, middleware, JSON binding and validation.

The framework is minimal: you choose the ORM and project structure. That is a familiar approach for Go developers.

A Go binary compiles to a single file, starts fast and uses little memory, so Gin is often chosen for microservices and APIs.

You need a full stack with admin and ORM out of the box: Django, Rails, Laravel.
For simple cases, the standard net/http in recent Go versions is enough.

Context: *gin.Context carries the request, response and values between middleware.
Router group: A group of routes with a shared prefix and middleware.
Binding: Parsing JSON or a form into a struct with tag-based validation.
Middleware: A function that calls c.Next() or c.Abort().

The simplest server with one route.

1. Why is Gin fast?
A radix-tree router with no allocations on the hot path and less overhead than large frameworks. Go itself also handles networking quickly.
2. How does middleware work in Gin?
It is a gin.HandlerFunc run before or after the handler. c.Next() passes control on, c.Abort() stops the chain.
3. How do you validate input JSON?
Describe a struct with binding:"required" tags and call c.ShouldBindJSON(&dto). A validation failure comes back as an error.

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