The repetition of the keys seems like the sore point here. I could see a specialized form of JSON using jagged arrays {"Header": ["Name", "Street Address"

The repetition of the keys seems like the sore point here. I could see a specialized form of JSON using jagged arrays {"Header": ["Name", "Street Address", "City"] "Body": [ ["Alice", "123 Fake St", "Faketon"], ["Bob", "987 Any Pl", "Anytown"], ]} in that way the keys aren't repeated. It wouldn't be coherent useful JS objects when deserialized, but it would be trivial to convert js table object into a true array of Javascript objects.