Currently, you do not support JSONB for Postgres:
JSONB has many great features. For example, it allows you to make indices on the columns:
CREATE INDEX idxgintags ON api USING gin ((jdoc -> 'tags'));
This is super helpful if you often do a `where` on your JSONB columns.
It shouldn't be much of a lift because Postgres converts from JSON to JSONB for you automatically.