Json fileds type validation

[egor-ponomarev]

Hello all !

I would like to know if there is any way or any plan to have the ability of validation values/types of json fields when parsing?
Let's say we have a struct with time.Time field:

type Country struct {
	Id        int
	CreatedAt time.Time
}

and try to parse a json where CreatedAt is an integer:

func TestWrongFieldType(t *testing.T) {
	// Arrange
	actualCity := &Country{}
	bytes := []byte("{\"id\":5, \"createdAt\": 2}")

	// Act
	// json = "github.com/goccy/go-json"
	err := json.Unmarshal(bytes, actualCity)

	// Assert
	assert.NotNil(t, err)
	assert.Equal(t, "Time.UnmarshalJSON: input is not a JSON string", err.Error())
}

Would it be possible to get in the error more detailed info, something like:

errors: [
   { 
       "createdAt": "wrong value"
   }
]

In case of several nested fields (including array fields) and several errors it could be:

errors: [
   { 
       "continent.name": "wrong value (or more detailed error description)"
   },
   { 
       "population.city[4].count": "wrong value (or more detailed error description)"
   },   
]

Thank you in advance!