Validating your first HTML form

Most of the time, we have to validate a client's input before processing it, which can be achieved through the number of external packages in Go, such as gopkg.in/go-playground/validator.v9, gopkg.in/validator.v2, and github.com/asaskevich/govalidator.

In this recipe, we will be working with the most famous and commonly used validator,   github.com/asaskevich/govalidator, to validate our HTML form.

Getting ready…

As we have already created and read an HTML form in our previous recipe, we will just extend it to validate its field values.

How to do it…

1. Install github.com/asaskevich/govalidator and the github.com/gorilla/schema package using the go get command, as follows:

$ go get github.com/asaskevich/govalidator
$ go get github.com/gorilla/schema

2. Create html-form-validation.go, where we will read an HTML form, decode it using github.com/gorilla/schema, and validate each field of it against a tag defined in the User struct using github.com/asaskevich/govalidator,...