Question

then how do we store json data into strreams in multichain 1.0

Answer 1

If you want to store JSON in MultiChain 1.0.x, you need to perform serialization and deserialization yourself at the application level. For example you could use the UBJSON format (as used internally in MultiChain 2.0) for which there are libraries available in many programming languages:

http://ubjson.org/libraries/