package.json Generator
Generate a valid package.json for Node.js and npm projects.
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What is package.json Generator?
The package.json Generator is a browser-based tool that builds a valid npm manifest from a simple form. It covers the basics (name, version, description, license), entry points (main, module, types, bin, files), scripts, dependencies, devDependencies, engines, and repository fields — with live validation and a real-time JSON preview.
Key Benefits
- No syntax errors from hand-editing JSON
- Validates npm naming rules and semver live
- Fields ordered the way npm expects
- Works offline, nothing uploaded
Common Use Cases
- •Scaffolding a new Node.js library or CLI
- •Converting a project from CommonJS to ESM
- •Documenting engines and scripts for a team
- •Preparing an open-source package for publish
How to Generate a package.json
- Fill in the Basics: Enter the package name, version, description, license, module type (ESM or CommonJS), and whether the package is private.
- Set Entry Points: Optionally add main, module, types, bin, and the files allowlist that controls what gets published to npm.
- Add Scripts and Dependencies: Create npm scripts like start, build, and test, then list dependencies and devDependencies with their version ranges.
- Add Repository and Engines: Point to your Git repository and declare the minimum Node.js and npm versions your package requires.
- Copy or Download: Review the live JSON preview, then copy it to your clipboard or download it as package.json into your project.
Key Features
- Complete Field Coverage: Build every common field: name, version, description, main, module, types, bin, files, type, scripts, dependencies, devDependencies, engines, repository, license, and private.
- Live Name and Version Validation: The package name is checked against npm naming rules and the version against semver as you type, with clear inline warnings.
- Dynamic Script and Dependency Rows: Add, edit, and remove scripts and dependencies in a table-like editor instead of hand-editing JSON.
- Live JSON Preview: The generated package.json updates on every keystroke, with fields emitted in conventional npm order.
- Copy or Download: Copy the manifest to your clipboard or download it as a ready-to-use package.json file.
- Fully Offline: Everything runs in your browser. No data is uploaded to any server.
Frequently Asked Questions
What is package.json?
package.json is the manifest file for Node.js projects. It records the package name, version, entry points, scripts, dependencies, and metadata that npm, yarn, and pnpm use to install and run your project.
What makes a package name valid?
npm requires lowercase names without spaces, limited to letters, digits, hyphens, underscores, and dots. Scoped packages use the @scope/name format. The tool validates your name against these rules as you type.
Should I use type module or commonjs?
Use "type": "module" for modern ESM projects that use import and export. Leave it as CommonJS if your code uses require and module.exports, or if you depend on older tooling that does not support ESM.
What does the private field do?
Setting "private": true prevents the package from being published to the npm registry. It is recommended for applications and internal projects that should never be published.
Is my data uploaded anywhere?
No. The generator runs entirely in your browser and works offline. Nothing you type is sent to any server.