[fshafique]

Does it solve the problem of repeating set of keys in an object array, eg. when representing a table?

I don't think using a dictionary of key values is the way to go here. I think there should be a dedicated "table" type, where the column keys are only defined once, and not repeated for every single row.

[ubutler]

MessagePack can encode rows as well and then you just need to manage linking the keys during deserialization. In fact, it can encode arbitrary binary without needing base64 like JSON.

[feverzsj]

You can just use array of array like most scientific applications do.

[fshafique]

I can do that with JSON too. I was hoping MessagePack would have built-in functionality to do it.