The cfnlint package is an AWS CloudFormation linter that uses the AWS CloudFormation Resource Specification and is customizable and extendible with a custom ruleset.

Package is available through pip:

pip install cfnlint

• Lint specified Cloudformation yaml file
• Lint agains eu-west-1 CloudFormation definition

• Tests, linter, Code Conventions, etc.
• Add Custom rules to extend/override the AWS specification
• Lint against specific region
• Add Pluggable system to add custom resource handlers for special/extended rules

Current planned roadmap:

Optional but recommended. Example:

$ virtualenv -p python3 venv
$ source venv/bin/activate

$ pip install -e .

$ cfn-lint --cfn_file test_stack.yaml