https://www.postgresql.org/about/featurematrix/#json https://www.postgresql.org/about/featurematrix/#json You're right, 9.4/9.5 were when JSONB was introduced

https://www.postgresql.org/about/featurematrix/#json https://www.postgresql.org/about/featurematrix/#json You're right, 9.4/9.5 were when JSONB was introduced and expanded (release 2013/2014). That said, it's a big decision to go with two very very different technologies (relational vs Document store) just for a column type, storing JSON must have been a pretty major product feature?