package.json Generator

What is package.json Generator?

Package.json Generator creates valid Node.js package.json files with proper field formatting, semantic versioning, and npm-compliant metadata. It supports all standard fields including name validation (lowercase, no spaces, URL-safe), version following semver, main/module/exports entry points for dual CJS/ESM packages, scripts, dependencies with version ranges, engines, repository links, and license identifiers from the SPDX license list. The tool also generates workspace configurations for monorepo setups.

Node.js developers starting new projects, library authors publishing packages to npm, and DevOps engineers configuring JavaScript build pipelines. The tool runs entirely in your browser — your data never leaves your device.

How to Use package.json Generator

1. Enter the package name, version, and description
2. Configure entry points — main for CJS, module for ESM, exports for conditional exports
3. Add scripts, dependencies, and devDependencies with version ranges
4. Review the generated JSON and download or copy the package.json file

Common Use Cases

• Scaffolding new Node.js projects with correct package.json structure from scratch
• Configuring dual CJS/ESM package exports for library authors publishing to npm
• Setting up monorepo workspace configurations for Yarn, pnpm, or npm workspaces
• Generating package.json for serverless functions with minimal dependency declarations

Pro Tips

• Use the exports field instead of main/module for modern packages — it supports conditional exports for import vs require, subpath exports, and prevents deep imports from internal modules
• Pin exact dependency versions in applications (1.2.3) but use caret ranges (^1.2.3) in libraries — applications need reproducibility while libraries need flexibility to avoid duplicate dependencies
• The engines field is advisory by default — add engine-strict to your .npmrc or use the engines-strict flag to make npm actually reject installs on incompatible Node versions

Why Use This Tool?

• Privacy-first: All processing happens locally in your browser. No data is transmitted to any server.
• No installation required: Works in any modern browser on desktop or mobile.
• Completely free: No account, no credit card, no usage caps.
• Fast and reliable: Powered by modern Web APIs for near-instant results.

Related Concepts

Learn more about related topics: npm registry, Semantic versioning, CommonJS, ES Modules.

Frequently Asked Questions