# Install yamale with Homebrew, apt, Nix Schema and validator for YAML. Version 6.1.0 via Homebrew; verified from local package data. ## Install ```sh sudo av install brew:yamale ``` Additional install commands: ### macOS - Homebrew (100%): ```sh brew install yamale ``` Evidence: local Homebrew formula metadata ### Linux - Debian apt (92%): ```sh sudo apt install python3-yamale ``` Evidence: Debian stable package indexes: python3-yamale from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz - Nix (92%): ```sh nix profile install nixpkgs#yamale ``` Evidence: nixpkgs package indexes: yamale from https://raw.githubusercontent.com/NixOS/nixpkgs/master/pkgs/top-level/all-packages.nix ## Package facts - **Package key:** brew:yamale - **Package manager:** Homebrew - **Package manager page:** - **Version:** 6.1.0 - **Source summary:** Schema and validator for YAML - **Homepage:** - **Repository:** - **Upstream docs:** - **License:** MIT - **Source archive:** - **Generated:** 2026-07-08T07:18:31+00:00 ## Executables - yamale (cli) - yamale (alias) ## Dependencies - libyaml - python@3.14 ## 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: 6.1.0 - Local data: ok - Upstream repository: https://github.com/23andMe/Yamale - info: No package-manager update timestamp was available. - info: No cached GitHub release or tag data was available. ## Project history and usage Yamale is a Python library and command-line tool for validating YAML files with schemas written in Yamale's own YAML-based schema language. It fills the small but common gap between loose YAML configuration files and heavyweight JSON Schema workflows. ### Project history 23andMe published the Yamale repository in January 2014. The README describes it simply as a schema and validator for YAML, with both CLI and Python API entry points. Its schema format keeps schemas as YAML documents whose leaves are validator expressions such as `str()`, `int()`, includes, recursion, strict-mode controls, and custom validators. The PyPI history shows public releases beginning in June 2014 and continued maintenance into the 6.x series. Over time the README added Python 3-only requirements, optional ruamel.yaml parsing for YAML 1.2 support, multiprocessing CLI validation, strict-mode controls, and a warning that schemas should come from trusted sources because the schema language is executable enough to be treated as a trust boundary. ### Adoption history Yamale adoption is mostly practical: teams with YAML configuration, data files, or repository conventions can add a schema file and run a CLI check in tests or continuous integration. It is attractive when a project wants a readable schema next to YAML data without converting the validation problem to JSON Schema. ### How it is used From the command line, Yamale searches a target path for YAML files and looks nearby or upward for a schema file unless one is specified. From Python, callers build schema and data objects with `yamale.make_schema` and `yamale.make_data`, then call `yamale.validate` and handle validation errors. Yamale is best suited to project-owned schemas: configuration contracts, fixtures, data drops, and repository policy checks. Its own README cautions against accepting malicious schema definitions from untrusted sources. ### Why package nerds care For package nerds, Yamale is a tidy example of a domain-specific validator that stayed deliberately smaller than JSON Schema. It shows up as both a CLI package and a Python import, useful for making YAML-heavy projects less ambiguous without buying into a larger schema ecosystem. ### Timeline - 2014-01: The public GitHub repository was created under 23andMe. - 2014-06: PyPI records the earliest available Yamale release uploads. - 2020s: The README documents Python 3.8+, optional ruamel.yaml parsing, CLI multiprocessing, includes, recursion, and strict-mode behavior. - 2025: PyPI records the 6.x release line. ### Related projects - Yamale sits near JSON Schema validators, PyKwalify, Cerberus-style Python validators, and YAML linters, but it keeps its own compact schema expression syntax rather than adopting JSON Schema as the schema language. ### Sources - - - ## Security Notes narrow executable package without higher-risk signals. - **Geiger risk:** green / low - narrow executable package without higher-risk signals ## Source Database Details - **Source Database:** Homebrew formula API - **Tap:** homebrew/core - **Full Name:** yamale - **Version Scheme:** 0 - **Revision:** 0 - **Head Version:** HEAD - **Bottle Stable Root URL:** - **Deprecated:** no - **Disabled:** no - **Keg Only:** no - **URL Keys:** head, stable ## Other Package-Manager Records - Debian apt - python3-yamale - 6.0.0.1-1: normalized package name match | Debian stable package indexes: python3-yamale from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | schema and validator for YAML | https://github.com/23andMe/Yamale - Nix - yamale: normalized package name match | nixpkgs package indexes: yamale from https://raw.githubusercontent.com/NixOS/nixpkgs/master/pkgs/top-level/all-packages.nix ## Related links - [Source-control packages](https://www.automicvault.com/pkg/source-control-tools/) - Belongs to a source-control command family. - [Terminal utility packages](https://www.automicvault.com/pkg/terminal-utilities/) - Matched terminal and command-line workflow metadata. - [Text processing packages](https://www.automicvault.com/pkg/text-processing-tools/) - Matched text, document, or structured-data processing metadata. - [Developer build packages](https://www.automicvault.com/pkg/developer-build-tools/) - Matched build, compiler, generator, or developer workflow metadata. - [python@3.14](https://www.automicvault.com/pkg/brew/python-3-14/) - Runtime dependency declared by Homebrew. - [chart-testing](https://www.automicvault.com/pkg/brew/chart-testing/) - Popular package that depends on this formula. - [action-validator](https://www.automicvault.com/pkg/brew/action-validator/) - Shares av.db curated category or tags: cli, developer-tools, validation, yaml. - [check-jsonschema](https://www.automicvault.com/pkg/brew/check-jsonschema/) - Shares av.db curated category or tags: cli, developer-tools, python, validation. - [epubcheck](https://www.automicvault.com/pkg/brew/epubcheck/) - Shares av.db curated category or tags: cli, developer-tools, validation. - [config-file-validator](https://www.automicvault.com/pkg/brew/config-file-validator/) - Shares av.db curated category or tags: cli, developer-tools, validation, yaml. - [jenkins-job-builder](https://www.automicvault.com/pkg/brew/jenkins-job-builder/) - Shares av.db curated category or tags: cli, developer-tools, python, yaml. - [kubeconform](https://www.automicvault.com/pkg/brew/kubeconform/) - Shares av.db curated category or tags: cli, developer-tools, validation. - [rnv](https://www.automicvault.com/pkg/brew/rnv/) - Shares av.db curated category or tags: cli, developer-tools, validation. - [vnu](https://www.automicvault.com/pkg/brew/vnu/) - Shares av.db curated category or tags: cli, developer-tools, validation. - [yamllint](https://www.automicvault.com/pkg/brew/yamllint/) - Both packages touch the same language runtime or ecosystem. Shared terms: cli, developer, developer-tools, libyaml, python. ## Combined YAML source View the package source record on GitHub. [combined/yamale.yml](https://github.com/automic-vault/db/blob/main/combined/yamale.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 - external package-manager database matches - cross-ecosystem install command graph