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:

$ python -m json.tool < data.json
No JSON object could be decoded

Here are the contents of data.json:

$ cat data.json
{ "fields": 
    [
        [ "first_name", null, {} ],
        [ "last_name", null, {} ],
        [ "addr1", null, {} ],
        [ "addr2", null, {} ],
        [ "city", null, {} ],
    ]
}

I don't have a problem with single quotes, nor is the file empty (obviously), so I'm not sure what's causing the problem here.

cat dr-operators-config.json | python -m json.tool – Kanagavelu Sugumar Oct 27 '17 at 16:02 — Kanagavelu Sugumar, Oct 27 '17 at 16:02
python -m json.tool... good to know it exists. – Hola Soy Edu Feliz Navidad Jul 04 '18 at 14:39 — Hola Soy Edu Feliz Navidad, Jul 04 '18 at 14:39

score 18 · Accepted Answer · edited May 23 '17 at 12:02

18

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.

edited May 23 '17 at 12:02

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answered Sep 20 '13 at 17:38

3cheesewheel

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

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