🔎 Validation

Validator package

Fiber can make great use of the validator package to ensure correct validation of data to store.

You can find the detailed descriptions of the validations used in the fields contained on the structs below:

  1. type Job struct{
  2.     Type          string `validate:"required,min=3,max=32"`
  3.     Salary        int    `validate:"required,number"`
  4. }
  6. type User struct{
  7.     Name          string  `validate:"required,min=3,max=32"`
  8.     IsActive      bool    `validate:"required,eq=True|eq=False"`
  9.     Email         string  `validate:"required,email,min=6,max=32"`
  10.     Job           Job     `validate:"dive"`
  11. }
  13. type ErrorResponse struct {
  14.     FailedField string
  15.     Tag         string
  16.     Value       string
  17. }
  19. func ValidateStruct(user User) []*ErrorResponse {
  20.     var errors []*ErrorResponse
  21.     validate := validator.New()
  22.     err := validate.Struct(user)
  23.     if err != nil {
  24.         for _, err := range err.(validator.ValidationErrors) {
  25.             var element ErrorResponse
  26.             element.FailedField = err.StructNamespace()
  27.             element.Tag = err.Tag()
  28.             element.Value = err.Param()
  29.             errors = append(errors, &element)
  30.         }
  31.     }
  32.     return errors
  33. }
  35. func AddUser(c *fiber.Ctx) error {
  36.     //Connect to database
  38.     user := new(User)
  40.     if err := c.BodyParser(user); err != nil {
  41.         return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
  42.             message: err.Error(),
  43.         })
  45.     }
  47.     errors := ValidateStruct(*user)
  48.     if errors != nil {
  49.        return c.JSON(errors)
  51.     }
  53.     //Do something else here
  55.     //Return user
  56.    return c.JSON(user)
  57. }
  59. // Running a test with the following curl commands
  60. // curl -X POST -H "Content-Type: application/json" --data "{\"name\":\"john\",\"isactive\":\"True\"}" http://localhost:8080/register/user
  62. // Results in
  63. // [{"FailedField":"User.Email","Tag":"required","Value":""},{"FailedField":"User.Job.Salary","Tag":"required","Value":""},{"FailedField":"User.Job.Type","Tag":"required","Value":""}]⏎