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oapi-codegen/nullable

An implementation of a Nullable type for JSON bodies, indicating whether the field is absent, set to null, or set to a value

Unlike other known implementations, this makes it possible to both marshal and unmarshal the value, as well as represent all three states:

  • the field is not set
  • the field is explicitly set to null
  • the field is explicitly set to a given value

And can be embedded in structs, for instance with the following definition:

obj := struct {
		// RequiredID is a required, nullable field
		RequiredID     nullable.Nullable[int]     `json:"id"`
		// OptionalString is an optional, nullable field
		// NOTE that no pointer is required, only `omitempty`
		OptionalString nullable.Nullable[string] `json:"optionalString,omitempty"`
}{}

Usage

Important

Although this project is under the oapi-codegen org for the oapi-codegen OpenAPI-to-Go code generator, this is intentionally released as a separate, standalone library which can be used by other projects.

First, add to your project with:

go get github.com/oapi-codegen/nullable

Check out the examples in the package documentation on pkg.go.dev for more details.

Credits

As well as contributions from:

License

Licensed under the Apache-2.0 license.