Apache Avro's C++ deserializer for the JSON serialization used to expect exactly that: keys to be in schema order. Trust me you don't want this. Usually the re

Apache Avro's C++ deserializer for the JSON serialization used to expect exactly that: keys to be in schema order. Trust me you don't want this. Usually the reason you want to use JSON in the first place is you want to support third party data access. Even if you constrained the field order you'd still have to deal with absent fields.