package encoding/json
Golang encoding/json.Number type usage example
func (j *Json) Uint64() (uint64, error) {
switch j.data.(type) {
case json.Number: // <------ here
return strconv.ParseUint(j.data.(json.Number).String(), 10, 64)
case float32, float64:
return uint64(reflect.ValueOf(j.data).Float()), nil
case int, int8, int16, int32, int64:
return uint64(reflect.ValueOf(j.data).Int()), nil
case uint, uint8, uint16, uint32, uint64:
return reflect.ValueOf(j.data).Uint(), nil
}
return 0, errors.New("invalid value type")
}
Reference :
http://golang.org/pkg/encoding/json/#Number
