aws-cloudformation/cfn-lint

Health v2 · maintenance only

Adoption not part of the score

2640 stars · 640 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

cfn-lint is a Python CLI tool that validates AWS CloudFormation templates (YAML/JSON) against resource provider schemas and best-practice checks. It supports SAM template transformation and validates resource properties and values on a best-effort basis.

Use cases

• validate cloudformation templates before deploying
• lint aws cloudformation yaml files in ci
• check cfn template resource properties and values
• validate aws sam templates
• catch cloudformation best practice violations
• verify cfn template syntax and schema compliance

When to choose

• you write or review AWS CloudFormation or SAM templates
• you want automated template validation in CI/CD pipelines
• you need schema-based checks for CloudFormation resource properties

When to avoid

• you use Terraform, Pulumi, or other non-CloudFormation IaC tools
• you need guaranteed validation of all intrinsic function value combinations, since value checks are best-effort

Facets

cli-tool · maturity active

linter cli developer-tools yaml json infrastructure-as-code cloud-computing developer-tools python cli cross-platform aws cloudformation infrastructure-as-code template-validation sam devops command-line

Member repositories

For agents

markdown · JSON · MCP: product_card(name="aws-cloudformation/cfn-lint")