cfn-lint

Install command: 
brew install cfn-lint

Validate CloudFormation templates against the CloudFormation spec

https://github.com/aws-cloudformation/cfn-lint/

License: MIT-0

Development: Pull requests

Formula JSON API: /api/formula/cfn-lint.json

Formula code: cfn-lint.rb on GitHub

Bottle (binary package) installation support provided for:

macOS on
Apple Silicon		 tahoe ✅
sequoia ✅
sonoma ✅
macOS on
Intel		 sonoma ✅
Linux ARM64 ✅
x86_64 ✅

Current versions:

stable ✅ 1.51.5

Depends on:

libyaml 0.2.5 YAML Parser
pydantic 2.13.4 Data validation using Python type hints
python@3.14 3.14.6 Interpreted, interactive, object-oriented programming language
rpds-py 2026.5.1 Python bindings to Rust's persistent data structures

Analytics:

Installs (30 days)
cfn-lint 3,498
cfn-lint --HEAD 2
Installs on Request (30 days)
cfn-lint 2,441
cfn-lint --HEAD 2
Build Errors (30 days)
cfn-lint 0
Installs (90 days)
cfn-lint 10,122
cfn-lint --HEAD 17
Installs on Request (90 days)
cfn-lint 7,043
cfn-lint --HEAD 17
Installs (365 days)
cfn-lint 40,042
cfn-lint --HEAD 60
Installs on Request (365 days)
cfn-lint 29,769
cfn-lint --HEAD 60