cfn-lint

Validates CloudFormation templates against AWS specifications

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Validate CloudFormation templates against the CloudFormation spec

cfn-lint

Validate a CloudFormation template file$ cfn-lint template.yaml

Lint multiple templates and output as JSON$ cfn-lint -f json template1.yaml template2.yaml

Validate template ignoring specific rule violations$ cfn-lint template.yaml --ignore-checks W3002 E3012