validation

Validation

The validator package provides validation against a variable value or against the values of the fields in a struct by declaring a "tag" that instruct the engine how we want to validate the value using some built-in rules. This recipe shows how we can use this package to perform value validation.

There are 2 parts in this recipe.

• main.go - sample code of using the validator package.
• *_test.go - a set of test cases that show the different validation tags - good sample code to see the extent/richness of supported validation rules that are provided by the package.

Setup

1. Run the sample code.

   $ make run
   

2. Run (via test) to see the validation rules in action.

   $ make test
   

3. Run both at the same time.

   $ make
   

Reference

• Validator package
• Some formats that are supported in the validation rules.
  • ISO 3166 - 2- and 3-letter country codes
  • ISO 4217 - Currency codes
  • Timezone