jsonVsjsonb.txt

The data types json and jsonb, as defined by the PostgreSQL documentation,are almost identical; 

the key difference is that json data is stored as an exact copy of the JSON input text, whereas jsonb stores data in a decomposed binary form; that is, not as an ASCII/UTF-8 string, but as binary code.

And this has some immediate benefits:

more efficiency,
significantly faster to process,
supports indexing (which can be a significant advantage, as we'll see later),
simpler schema designs (replacing entity-attribute-value (EAV) tables with jsonb columns, which can be queried, indexed and joined, allowing for performance improvements up until 1000X!)


And some drawbacks:

slightly slower input (due to added conversion overhead),
it may take more disk space than plain json due to a larger table footprint, though not always,
certain queries (especially aggregate ones) may be slower due to the lack of statistics.