README.md

eslint-plugin-package-json

Rules for consistent, readable, and valid package.json files. 🗂️

Installation

This package requires ESLint >=8:

npm install eslint eslint-plugin-package-json --save-dev

Usage

Flat Config

This plugin's recommended configuration enables its rules on **/package.json files, parsing them with jsonc-eslint-parser.

In your ESLint configuration file:

import packageJson from "eslint-plugin-package-json/configs/recommended";

export default [
	// your other ESLint configurations
	packageJson,
];

If you want to override the recommended rules:

import packageJson from "eslint-plugin-package-json/configs/recommended";

export default [
	// your other ESLint configurations
	{
		...packageJson,
		rules: {
			...packageJson.rules,
			"package-json/valid-package-def": "off",
		},
	},
];

See ESLint's Configuration Files guide for details on how to customize your rules and other config settings.

Legacy Config

Usage with ESLint's legacy ("eslintrc") format requires also installing jsonc-eslint-parser:

npm install jsonc-eslint-parser --save-dev

Add an override to your ESLint configuration file that specifies jsonc-eslint-parser, this plugin, and its recommended rules for your package.json file:

module.exports = {
	overrides: [
		{
			extends: ["plugin:package-json/recommended"],
			files: ["package.json"],
			parser: "jsonc-eslint-parser",
			plugins: ["package-json"],
		},
	],
};

You may also want to individually configure rules. See ESLint's Configure Rules guide for details on how to customize your rules.

module.exports = {
	overrides: [
		{
			extends: ["plugin:package-json/recommended"],
			files: ["package.json"],
			parser: "jsonc-eslint-parser",
			plugins: ["package-json"],
			rules: {
				"package-json/valid-package-def": "error",
			},
		},
	],
};

Usage Alongside Prettier

prettier-plugin-packagejson is a Prettier plugin that enforces the same package.json keys ordering as the order-properties and sort-collections rules with default options. We recommend using both the Prettier plugin and eslint-plugin-package-json's recommended configuration. The default settings don't conflict, and Prettier plugins can quickly fix up ordering in your editor on save and/or as a Git hook.

Supported Rules

💼 Configurations enabled in.
✅ Set in the recommended configuration.
🔧 Automatically fixable by the --fix CLI option.
💡 Manually fixable by editor suggestions.

Name	Description	💼	🔧	💡
order-properties	Package properties must be declared in standard order	✅	🔧
repository-shorthand	Enforce either object or shorthand declaration for repository.	✅	🔧
sort-collections	Dependencies, scripts, and configuration values must be declared in alphabetical order.	✅	🔧
unique-dependencies	Checks a dependency isn't specified more than once (i.e. in dependencies and devDependencies)	✅		💡
valid-local-dependency	Checks existence of local dependencies in the package.json	✅
valid-name	Enforce that package names are valid npm package names	✅
valid-package-def	Enforce that package.json has all properties required by the npm spec	✅
valid-repository-directory	Enforce that if repository directory is specified, it matches the path to the package.json file	✅		💡
valid-version	Enforce that package versions are valid semver specifiers	✅

These rules only run on package.json files; they will ignore all other files being linted. They can lint package.json files at project root and in any subfolder of the project, making this plugin great for monorepos.

Development

See .github/CONTRIBUTING.md, then .github/DEVELOPMENT.md. Thanks! 💖

Contributors

Alan 🐛 💻	Andreas Lindberg 🐛	Anton Khitrenovich 🤔	Azat S. 🤔 💻	David LJ 📖	Heggria 🤔	James 💻
James Zetlen 💻 🐛 📖 🚇 🚧 🔧	Jesús Leganés-Combarro 💻	Josh Goldberg ✨ 🔧 🐛 💻 🚇 📖 🚧 🤔	Kendall Gassner 💻 🚧	Kristjan ESPERANTO 🤔 🐛 💻	Mathias Schreck 🤔	Michael "Mike" Ferris 💻
Nick Schonning 💻	Pavel 🤔 🔧 📖	Sasial 💻	Stephen 💻	Stephen Zhou 🐛 💻 🤔 📖	Yosuke Ota 🐛 💻	b3rnhard 🐛

Appreciation

Many thanks to @zetlen for creating the initial version and core infrastructure of this package! 💖

💙 This package was templated with create-typescript-app.