jq is a command-line JSON processor.

If you want to learn to use jq, read the documentation at http://stedolan.github.io/jq. This documentation is generated from the docs/ folder of this repository. You can also try it online at http://jqplay.org.

Basic filters

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jq '.'
Input "Hello, world!"
Output    "Hello, world!"

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jq '.foo'
Input {"foo": 42, "bar": "less interesting data"}
Output    42

More details please check it out from original website

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http://stedolan.github.io/jq/manual/ 

Next post, I’d like to use this for parser the aws result. (coming soon.)