cfn-lint ☆
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Description:
Validate CloudFormation templates against the CloudFormation spec
Type: Formula  |  Latest Version: 1.43.0@0  |  Tracked Since: Dec 17, 2025
Links: Homepage  |  formulae.brew.sh
Category: Devops
Tags: cloudformation aws linting devops infrastructure-as-code
Install: brew install cfn-lint
About:
cfn-lint is a command-line tool that validates AWS CloudFormation templates against the official AWS resource specifications. It checks for syntax errors, best practices, and potential security issues before deployment. This helps developers catch configuration mistakes early, ensuring templates are reliable and compliant.
Key Features:
  • Validates templates against AWS CloudFormation spec
  • Enforces best practices and security rules
  • Provides actionable error and warning messages
  • Supports both JSON and YAML template formats
Use Cases:
  • Pre-deployment validation in CI/CD pipelines
  • Code reviews for CloudFormation template changes
  • Migrating templates to newer CloudFormation resource specifications
Alternatives:
  • cfn-guard – cfn-guard focuses on policy-as-code compliance, while cfn-lint performs broader spec and best practice validation.
  • tfsec – tfsec is for Terraform, whereas cfn-lint is specifically designed for CloudFormation templates.
Version History
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