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Build your first open-source JavaScript library
Rating: 5.0 out of 5(5 ratings)
38 students

Build your first open-source JavaScript library

Learn how to build, package, and publish your own open-source JavaScript library—step by step!
Created byRalph Florent
Last updated 3/2025
English

What you'll learn

  • Publish your library with confidence to NPM.
  • Design, implement, and publish an easy-to-maintain library with clear objectives.
  • Follow community-standard guidelines, such as contributing best practices.
  • Gain a deep understanding of open-source intricacies, including linting and formatting.
  • Evaluate and manage 3rd-party dependencies carefully, considering vulnerabilities and maintenance.
  • Enhance developer experience by ensuring your library is intuitive and easy to use.
  • Plan a roadmap that outlines your intent and long-term vision, including your library’s end of life.
  • Strike a balance between under-engineering, over-engineering, and what’s "good enough" for your audience.

Course content

7 sections • 32 lectures • 2h 54m total length

  • Welcome2:16

    Explore how to structure, test, and publish your first open source JavaScript library with tools like Jest, Prettier, ESLint, Husky, Rollup, and TypeScript.

  • Prerequisites2:22
  • Course structure3:03

Requirements

  • Code Editor – VS Code is recommended for its great JavaScript/TypeScript support, but any editor works.
  • Node.js (v18.18+) – Required for running scripts, managing dependencies, and bundling your package.
  • Git – Basic knowledge of committing, pushing, and pulling is enough for version control.
  • NPM Account – Needed to publish your package on NPM
  • GitHub Account (optional) – Useful for repository management, documentation, and best practices.

Description

Hey there, fellow developer!

At some point in your journey, you've probably built something cool using tools crafted by other devs. Whether those tools were open-source or not, their creators made the decision to share them with the world—pretty awesome, right? Well, now it might be your turn to do the same! Whether you're looking to contribute to open source, level up your skills, or just satisfy your curiosity about how JavaScript libraries are built and shared, you're in the right place.

This course is designed for Junior to Mid-level developers who are ready to put their work out there (which, by the way, takes real courage—so kudos to you!). My goal is to help you do it the right way, while avoiding common pitfalls that frustrate even experienced developers (yep, been there myself!).

Since the JavaScript ecosystem is packed with tools, I’ve carefully selected the essentials to keep this course focused and practical. You’ll learn how to:

  • build a Node.js library and publish it on npm;

  • use Rollup for bundling your library;

  • work with TypeScript to write maintainable code;

  • set up key tools like Jest (for testing), Prettier (for formatting), and ESLint (for linting).

Now, just a heads-up—this isn't a JavaScript fundamentals course. Instead, think of it as your roadmap to launching an open-source project and getting your work into the hands of other developers.

This course was designed with care and built with love, so I hope it makes your journey into open source an exciting and rewarding experience. Thanks for considering this course, and I can't wait to see what you create!

Who this course is for:

  • You are a developer with basic knowledge of JavaScript or TypeScript.
  • You’ve built a project that you believe could be a valuable contribution to the community.
  • You have experience working with a large codebase and want to extract part of it as a reusable module.
  • You’re curious and just want to better understand how open-source libraries work.

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