*Guest post alert! Jack is a core maintainer of pgx, a PostgreSQL driver and toolkit for Go. He helped build the testing integration for CockroachDB and pgx. Jack blogs at https://www.jackchristensen.com/* -– Many applications benefit from representing some data in a relational structure and some data in a more flexible document structure like JSON. Taking advantage of the JSON functionality available in a relational database can reduce the need for a dedicated object database, minimize infrastructure and application complexity, and improve performance.