path: full-stack/go-chi-server/go-validator.md

- **Created on**: 2024-09-16 15:07:11

installation go validator

go get github.com/go-playground/validator/v10 

now the end point for the route is like this Example:

// import packages
type User struct {
    Username  string `json:"username" validate:"required,min=5,max=20"`
    Email     string `json:"email" validate:"required,email"`
    Age       int    `json:"age" validate:"gte=18,lte=120"`
}

func main() {
    r = chi.Router() // creating a router
    r.Get("/weclome", sayWelcome) // adding an end point
    return
}
func sayWelcome(w http.ResponseWriter, r *http.Request) {
    newUser = User {
        Username: "yosef", Email: "yooo@mgailgmail.com", age: 20,
    } // creating a instance from the struct user
    err := valiate.New(newUser) // starting validation the struct
    if err != nil { // if there an error
        // Validation failed, handle the error
        errors := err.(validator.ValidationErrors)
        http.Error(w, fmt.Sprintf("Validation error: %s", errors), http.StatusBadRequest)
        return
    }
    
    // Send a success response
    w.WriteHeader(http.StatusOK) // if the struct is valid
    fmt.Fprintf(w, "User created successfully!")
}

continue:go-mongodb.md
before:go-chi.md