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Script that validates JSON files and checks for duplicate keys.

Project Description

Checks a JSON file for any duplicate keys, which would be ignored by the normal parser.

Inspired by and based off of a python-list mailing list post: <>.


  • Python 2.7 or Python 3


  • pip install jsonchecker


  • git clone && cd jsonchecker && python install


  • jsonchecker file_to_validate.json
  • jsonchecker directory/of/json/files/

An optional --quiet argument can be passed, and will cause the script to print out a . instead of the full filename for each file scanned. Useful if you plan on checking a large number of files.

The script will exit with a status code of 1 if any duplicate keys are found, 0 if none are.

An optional --values argument can be passed to additionally check for duplicate values within each key. The script will exit with a status code of 1 if there are either duplicate keys or duplicate values are found, 0 if none are.

Released into the public domain.

Release History

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Source None Feb 9, 2016

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