type User struct {
    Name  string `json:"name" validate:"required"`
    Email string `json:"email" validate:"required,email"`
}

e.POST("/users", func(c echo.Context) error {
    u := new(User)
    if err := c.Bind(u); err != nil {
        return echo.NewHTTPError(http.StatusBadRequest, err.Error())
    }
    if err := c.Validate(u); err != nil {
        return echo.NewHTTPError(http.StatusBadRequest, err.Error())
    }
    // ...
})