[iEchoic]

I've found a few good applications for jsonb so far:

1) Using jsonb to store user-generated forms and submissions to those forms. As an example, you can create a form with text inputs, checkboxes, etc., and others can submit responses with that form. I find that these forms and their submissions are best stored as jsonb because their contents are largely opaque (I don't care about the contents except where they are rendered on the client), their structure is highly dynamic, and their schema changes frequently.

2) As a specialized case on #2, applying filters to user-generated form submissions. jsonb supports subset operators (@> and <@, if i remember correctly), which makes easy work of dynamically filtering form submissions on custom form fields even for complex filter conditions.

3) Storing/munging/slicing relatively low-volume log data is fantastic with jsonb. This is always for admin/diagnostic reasons, so it's not as performance-critical, and the ability to group on and do subset operations on jsonb fields makes slicing your data really easy.