Go Echo with Validator

go-echo-validator.go

package main

import (
	"net/http"

	"github.com/go-playground/validator/v10"
	"github.com/labstack/echo/v4"
)

type UserDetail struct {
	Email string `json:"email" validate:"required,email"`
	Age int `json:"age" validate:"required,gte=18"`
}

type CustomValidator struct {
	validator *validator.Validate
}

func (cv *CustomValidator) Validate(i interface{}) error {
	if err := cv.validator.Struct(i); err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, err.Error())
	}
	return nil
}

func main() {
	e := echo.New()
	e.Validator = &CustomValidator{validator: validator.New()}

	e.GET("/", func(c echo.Context) error {
		return c.JSON(http.StatusOK, map[string]string{"message": "hai"})
	})

	e.POST("/", func(c echo.Context) error {
		userData := new(UserDetail)
		if err := c.Bind(userData); err != nil {
			return c.JSON(http.StatusPreconditionFailed, map[string]string{"error": err.Error()})
		}

		if err := c.Validate(userData); err != nil {
			return c.JSON(http.StatusPreconditionFailed, map[string]string{"error": err.Error()})
		}

		return c.JSON(http.StatusOK, map[string]string{"message":"passed"})
	})

	e.Logger.Fatal(e.Start(":5000"))
}