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How to validate cloudformation templates on your computer?

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Thomas H Jones II

Even before I get to the point of letting AWS validate my templates, I usually run them through a local de-linter. Either jq or Python's json.tool module works a trick:

  • jq --exit-status . <FILENAME>
  • python -m json.tool <FILENAME>

Takes care of basic syntax checking. Both also work well inside a CI testing-rule (e.g., a .travis.yml file). Which means you can set up a git-trigger to only allow a branch-merge when a basic syntax check passes.