What are good CLI tools for JSON?

Question

General Problem

Though I may be diagnosing the root cause of an event, determining how many users it affected, or distilling timing logs in order to assess the perform

Answer 1

Recently I discovered that JSON can easily be eval-ed with Python:

$ python -c "json=eval(open('/json.txt').read()); print len(json['phoneNumber'])"
2

Though the method will obviously fail if the JSON input contains nulls.