I've been playing with jq, and I've been having a hard time finding examples of how it works with output from a service like AWS (which I use a lot).
Here is one I use a lot with vagrant-ec2.
When we're launching and killing a lot of instances, the AWS API is the only way to track down which instances are live, ready, dead, etc.
To find instances that are tagged with e.g. {"Key" = "Name", "Value" = "Web-00'} in the middle of a vagrant dev cycle, or a prod launch/replace cycle, you can do something like this: