Description:
Command-line tool for formatting AWS CloudFormation templates
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Type: Formula
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Latest Version: 1.24.1@0
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Tracked Since: Dec 17, 2025
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Links:
Homepage |
@AWSCloudForm |
formulae.brew.sh
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Category: Devops
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Tags:
aws
cloudformation
devops
formatting
infrastructure-as-code
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Install:
brew install cfn-format
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About:
cfn-format is a command-line utility that formats AWS CloudFormation templates into a clean, consistent, and readable structure. It parses templates and rewrites them with standardized indentation and ordering of keys, making them easier to maintain and review. The tool is part of the Rain suite, which provides a powerful set of commands for managing CloudFormation infrastructure.
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Key Features:
- Standardizes indentation and whitespace for readability
- Sorts keys and attributes for consistent diffs
- Supports both JSON and YAML input formats
- Integrates into CI/CD pipelines for enforcing style guides
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Use Cases:
- Enforcing a consistent style guide across CloudFormation templates in a team
- Automating template cleanup as a pre-commit hook
- Preparing templates for version control by ensuring clean, predictable diffs
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Alternatives:
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cfn-lint
– cfn-lint focuses on validating templates for errors and best practices, while cfn-format focuses on stylistic formatting.
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yamlfmt
– yamlfmt is a general-purpose YAML formatter that can be configured for CloudFormation, whereas cfn-format is CloudFormation-aware.
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