Creating NPM Package: Build, Test, and Publish Vanilla JavaScript Libraries Like a Pro

Updated for 2026

Do you want to publish high-quality JavaScript packages to NPM without struggling with complicated setups or unreliable release scripts?

Creating NPM Package is a hands-on, step-by-step guide that walks you through every stage of building a modern JavaScript library, from setting up your project to automating production releases.

This new edition includes the latest best practices, such as using semantic-release for automated versioning and release notes, setting up secure NPM Trusted Publishing, and a new chapter on making your JavaScript codebase more modular and scalable.

If you’ve ever asked yourself questions like these:

• How should I structure my JavaScript library?
• How do I automate versioning and changelogs without manual work?
• How do I securely publish using modern CI workflows?
• How do I scale my library beyond a single file?

This book gives you clear, practical answers to all of these questions.

What You’ll Learn Inside

• Configure a clean, scalable JavaScript project
• Define correct entry points
• Modularize your JavaScript codebase for maintainability
• Test your package before and after publishing
• Automate version management and release notes using semantic-release
• Implement NPM Trusted Publishing for secure, tokenless releases
• Create professional README and LICENSE files
• Publish and validate your package in both local and production environments

This book is more than just a tutorial. It gives you a repeatable system you can use for different projects.

Why Choose This Book

• Clear, simplified explanations without unnecessary theory
• Real-world workflows used by professional library authors
• Automation-first approach to eliminate manual release headaches
• It focuses on the steps for building and publishing libraries, not just on JavaScript programming itself.

Who This Book Is For

• JavaScript developers ready to publish reusable libraries
• Open-source contributors aiming to adopt professional workflows
• Teams requiring consistent and maintainable package configurations

Whether you’re publishing your first open-source project or improving a professional release process, this book will help you deliver clean, automated JavaScript libraries without extra complexity.

Start building smarter today. Start publishing like a pro.