Can&#x27;t speak for the original poster, but at this point Postgres is a very capable and performant document-store database as well with the addition of the JSONB type and associated indexing and modification (in 9.5) functions.  It&#x27;s also more mature, has generally better durability than MongoDB, and it is easy to fall back&#x2F;extend into relational queries on your document-store data if need be.<p>IMHO, unless you have a situation such that Mongo&#x27;s horizontal scaling is actually required, it&#x27;s better to use Postgres even if you&#x27;re doing document-store stuff.