validating JSON from command line using `python -m jsontool` gives 'No JSON object could be decoded'

Question

I have a data.json file that I\'m validating through the command line using python\'s json.tool, but it keeps giving me back an error message:

$ pyt         


        

Answer 1

It was because of the trailing comma after the last nested list [ "city", null, {} ]. I accidentally left it in and JSON doesn't allow them.