JsQuery
JsQuery – json query language with GIN indexing support
JsQuery is a language to query jsonb data type, introduced in PostgreSQL release 9.4. It's primary goal is to provide an additional functionality to jsonb (currently missing in PostgreSQL), such as a simple and effective way to search in nested objects and arrays, and more comparison operators with indexes support. We hope, that jsquery will be eventually a part of PostgreSQL. JsQuery is realized as an extension and is not available in the default PostgreSQL installation. It is available from GitHub under the same license as PostgreSQL and supports PostgreSQL 9.4+.