# Install cfn-format with Homebrew Command-line tool for formatting AWS CloudFormation templates. Version 1.24.4 via Homebrew; verified 2026-04-23. ## Install ```sh sudo av install brew:cfn-format ``` Additional install commands: ### macOS - Homebrew (100%): ```sh brew install cfn-format ``` Evidence: local Homebrew formula metadata ## Package facts - **Package key:** brew:cfn-format - **Package manager:** Homebrew - **Package manager page:** - **Version:** 1.24.4 - **Source summary:** Command-line tool for formatting AWS CloudFormation templates - **Homepage:** - **Repository:** - **Upstream docs:** - **License:** Apache-2.0 - **Source archive:** - **Last updated:** 2026-04-23T17:45:52Z - **Generated:** 2026-07-08T07:18:31+00:00 ## Executables - cfn-format (cli) - cfn-format (alias) ## Build dependencies - go ## Install behavior - Post-install hook: not defined - Bottle: available on arm64_linux, arm64_sequoia, arm64_sonoma, arm64_tahoe, sonoma, x86_64_linux ## Freshness - Page generated: 2026-07-08 - Package-manager version: 1.24.4 - Package-manager updated: 2026-04-23 - Local data: ok - Upstream repository: https://github.com/aws-cloudformation/rain - Upstream latest detected: v1.24.4 (current) ## Project history and usage cfn-format is the Homebrew-packaged command built from the AWS CloudFormation rain repository's `cmd/cfn-format`, focused on checking and formatting AWS CloudFormation templates. ### Project history The upstream rain repository was created in 2019 and describes rain as a development workflow tool for AWS CloudFormation templates and stacks. Its README lists consistent formatting of CloudFormation templates as a key feature of `rain fmt`, including JSON/YAML conversion and YAML comment preservation. ### Adoption history Homebrew packages `cfn-format` separately from rain, building the `./cmd/cfn-format` target from the rain source repository. This gives package users a narrower formatter binary without installing the broader rain workflow CLI name. ### How it is used The Homebrew formula test runs `cfn-format -v test.template` and expects a formatted-ok message. The rain README documents the broader formatter behavior under `rain fmt`. ### Why package nerds care cfn-format is package-nerd-interesting because it exposes one subcommand-sized slice of a larger CloudFormation workflow tool as its own formula, the kind of tiny binary split that helps scripts depend on exactly the formatter they need. ### Timeline - 2019: rain GitHub repository metadata records public repository creation. - 2019: GitHub release metadata records rain v0.1.0. - 2026: Homebrew formula builds cfn-format from rain v1.24.4. ### Related projects - rain is the upstream project and broader CloudFormation workflow CLI. - cfn-flip is the older AWS Labs converter whose CLI usage now points users to `rain fmt`. ### Sources - - - - - ## Security Notes infrastructure mutation or orchestration signal. - **Geiger risk:** orange / medium - infrastructure mutation or orchestration signal ## Source Database Details - **Source Database:** Homebrew formula API - **Tap:** homebrew/core - **Full Name:** cfn-format - **Version Scheme:** 0 - **Revision:** 0 - **Head Version:** HEAD - **Bottle Stable Root URL:** - **Deprecated:** no - **Disabled:** no - **Keg Only:** no - **URL Keys:** head, stable ## Related links - [Cloud CLI packages](https://www.automicvault.com/pkg/cloud-clis/) - Belongs to a cloud or infrastructure command family. - [Source-control packages](https://www.automicvault.com/pkg/source-control-tools/) - Belongs to a source-control command family. - [Secret-risk packages](https://www.automicvault.com/pkg/secret-risk-packages/) - Has protected-tool coverage, approval-gate, or non-low Geiger security signals. - [Terminal utility packages](https://www.automicvault.com/pkg/terminal-utilities/) - Matched terminal and command-line workflow metadata. - [go](https://www.automicvault.com/pkg/brew/go/) - Build dependency declared by Homebrew. - [aws-console](https://www.automicvault.com/pkg/brew/aws-console/) - Shares the same upstream source repository. - [rain](https://www.automicvault.com/pkg/brew/rain/) - Shares the same upstream source repository. - [cfnctl](https://www.automicvault.com/pkg/brew/cfnctl/) - Shares av.db curated category or tags: aws, cli, cloud-infrastructure, cloudformation, infrastructure-as-code. - [cfv](https://www.automicvault.com/pkg/brew/cfv/) - Shares av.db curated category or tags: aws, cli, cloud-infrastructure, cloudformation, infrastructure-as-code. - [cfn-flip](https://www.automicvault.com/pkg/brew/cfn-flip/) - Shares av.db curated category or tags: aws, cli, cloud-infrastructure, cloudformation. - [cloudformation-cli](https://www.automicvault.com/pkg/brew/cloudformation-cli/) - Shares av.db curated category or tags: aws, cli, cloud-infrastructure, cloudformation, infrastructure-as-code. - [eksctl](https://www.automicvault.com/pkg/brew/eksctl/) - Shares av.db curated category or tags: aws, cli, cloud-infrastructure, cloudformation. - [basti](https://www.automicvault.com/pkg/brew/basti/) - Shares av.db curated category or tags: aws, cli, cloud-infrastructure. - [cf2tf](https://www.automicvault.com/pkg/brew/cf2tf/) - Shares av.db curated category or tags: aws, cli, cloud-infrastructure, cloudformation, infrastructure-as-code. - [e1s](https://www.automicvault.com/pkg/brew/e1s/) - Shares av.db curated category or tags: aws, cli, cloud-infrastructure. ## Combined YAML source View the package source record on GitHub. [combined/cfn-format.yml](https://github.com/automic-vault/db/blob/main/combined/cfn-format.yml) ## Sources - Nucleus package database - Geiger risk classifier - package-page enrichment - curated package history - package version freshness - av.db category and tag curation - package relationship graph - cross-ecosystem install command graph