For storing json? There are some, though for that purpose Mongo provides great combination of features and usability, where using relational database for that f

For storing json? There are some, though for that purpose Mongo provides great combination of features and usability, where using relational database for that feels like fitting square peg in round hole, and usability of sql for processing this type of data sucks. For storing json at scale exceeding capacity of single server? Not that many.