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It's just a JSON syntax validator. You can't index on part of the json, postgres treats it as a string.

You can apply full text search on it, but that doesn't tell you if you're matching on a key or a value.

In postgres, you can index on a stored procedure, so you can use a simple stored procedure written in JavaScript to look up by key and return values, etc. Example available at http://people.planetpostgresql.org/andrew/index.php?/archive...