Go Form Validation with Struct Tags

Validate form data in Go using struct tags with the validator package, custom validation functions, nested struct validation, and human-readable error.

Go Form Validation Updated: 2026-01-15

Code

snippet

package main

import (
  "fmt"
  "github.com/go-playground/validator/v10"
)

type LoginForm struct {
  Email    string `validate:"required,email"`
  Password string `validate:"required,min=8"`
  Age      int    `validate:"gte=0,lte=150"`
}

func main() {
  v := validator.New()
  form := LoginForm{Email: "[email protected]", Password: "secret123", Age: 25}
  if err := v.Struct(form); err != nil {
    for _, e := range err.(validator.ValidationErrors) {
      fmt.Printf("Field %s failed: %s\n", e.Field(), e.Tag())
    }
  }
}