Robuta

https://github.com/usingjsonschema/ujs-jsonsyntax-python

GitHub - usingjsonschema/ujs-jsonsyntax-python: JSON syntax checker command line utility and library

JSON syntax checker command line utility and library - usingjsonschema/ujs-jsonsyntax-python

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https://daringfireball.net/projects/csschecker/

Daring Fireball: CSS Syntax Checker for BBEdit and TextWrangler

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