I've been using jsonb columns in PostgreSQL recently and have used CouchDB extensively in the past. I find the builtin support for JSON superior in PostgreSQL.

I've been using jsonb columns in PostgreSQL recently and have used CouchDB extensively in the past. I find the builtin support for JSON superior in PostgreSQL. There are a lot of nice built in operators for querying and creating indexes is much more concise. I wouldn't call it a side feature at all.