A hands-on walkthrough of validating and normalizing a real signup form in Go — trimming input, cross-field rules, slices, custom messages, and JSON error responses — using struct tags. Every Go API ends up needing the same thing: take a JSON body, clean it up, make sure it's valid, and tell the...
Source: [Dev.to](https://dev.to/onurcinar/struct-tag-validation-in-go-a-practical-guide-j4d)