compareJSON.go

// compareJSON is a lightweight alternative to 
// https://github.com/onsi/gomega/blob/master/matchers/match_json_matcher.go
func compareJSON(actual []byte, expected []byte) error {
	var aval interface{}
	var eval interface{}

	if err := json.Unmarshal(actual, &aval); err != nil {
		return err
	}
	if err := json.Unmarshal(expected, &eval); err != nil {
		return err
	}

	if !reflect.DeepEqual(aval, eval) {
		var oa, oe bytes.Buffer
		if err := json.Indent(&oa, actual, "", "\t"); err != nil {
			return err
		}
		if err := json.Indent(&oe, expected, "", "\t"); err != nil {
			return err
		}
		return fmt.Errorf("\nExpected: %s\nActual: %s", oe.Bytes(), oa.Bytes())
	}

	return nil
}