aws-cloudformation/cfn-lint
CloudFormation Linter observed · 2026-10-21
Health v2 · maintenance only
96/100
- Activity 100
- Release rhythm 88
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-10-21. Adoption (stars, forks) is never an input.
- gap_med: 6.0
- age_days: 3115
- days_rel: 0
- days_push: 0
- n_releases_24m: 111
Adoption not part of the score
2644 stars · 657 forks observed · 2026-10-21
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
1 source
- readme: https://github.com/aws-cloudformation/cfn-lint · fetched 2026-10-21 · 646c90df0fcc
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| aws-cloudformation/cfn-lint | main | 96 |
For agents
markdown · JSON · MCP: product_card(name="aws-cloudformation/cfn-lint")
Data as of 2026-10-19T08:05:51.212177+00:00 · Report a problem