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		 golden gate ✅
tahoe ✅
sequoia ✅
Linux ARM64 ✅
x86_64 ✅

Current versions:

stable ✅ 1.60.0
head ⚡️ HEAD

Depends on:

libyaml 0.2.5 YAML Parser
pydantic 2.14.3 Data validation using Python type hints
python@3.15 3.15.2 Interpreted, interactive, object-oriented programming language
rpds-py 2026.9.1 Python bindings to Rust's persistent data structures

Binaries: cfn-lint

GitHub Packages downloads:

Last 30 days47,808
Downloads1,726,184
Analytics install events (30 days)2,630
Downloads / install events (30 days)18.2×

Source: GitHub Packages, fetched 2026-11-12T00:54:09Z. Analytics dates: 2026-10-13 to 2026-11-12. Totals exclude downloads from Bintray before the migration to GitHub Packages. Downloads and install attempts measure different things; the difference does not count analytics opt-outs. Definitions and limitations.

Analytics:

30 days90 days365 days
Installs2,6287,24136,940
Installs (--HEAD)21046
Installs on Request1,8914,77126,999
Installs on Request (--HEAD)21046
Build Errors0