strictjson

Validate JSON objects against Go structs.

strictjson.Check allows you to check if all of the fields in a struct are satisfied by the incoming JSON message.

Example:

type Foo struct {
	A int    `json:"a"`
	B string `json:"b"`
}

func (f *Foo) UnmarshalJSON(b []byte) error {
	type __ Foo
	var g __
	if err := Check(b, f); err != nil {
		return err
	}
	if err := json.Unmarshal(b, &g); err != nil {
		return err
	}
	*f = Foo(g)
	return nil
}

In the above example, if a user tries to supply a json message that doesn't contain keys a and b, strictjson.Check will return an error.