For json unmarshalling of structs at least, I've become a pretty big fan of the validator library from the go playground: github.com/go-playground/validator/v1

For json unmarshalling of structs at least, I've become a pretty big fan of the validator library from the go playground: github.com/go-playground/validator/v10 It uses struct tags to validate the struct and is quite extensive. https://godoc.org/gopkg.in/go-playground/validator.v10 https://godoc.org/gopkg.in/go-playground/validator.v10