If running a big RDBMS is feasible: PostgreSQL has pretty good json support, extended in the upcoming v9.4.

PostgreSQL docs: JSON datatypes (links to 9.4, but 9.3 links are easily reached from there)

postgres/mongodb JSON comparison (EnterpriseDB is a postgres support company)

In reply to Re: Simple JSON based data storage - what would you recommend? by erix
in thread Simple JSON based data storage - what would you recommend? by blindluke

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