The definitive resource for mastering JavaScript's native module system. Explore tutorials and best practices for writing clean, reusable, and maintainable code.
Follow the learning path below to master ES Modules. Start with Fundamentals, practice with real-world examples, then dive into advanced topics to become an ES Modules pro.
Master import and export statements, named exports, default exports, and namespace imports.
Learn how ES Modules work in both browser and Node.js environments.
Dynamic imports, top-level await, circular dependencies, and live bindings.
Compare ES Modules vs CommonJS, bundlers, browser support, and module formats.
Bundlers, transpilers, testing frameworks, and development tools for ES Modules.
Step-by-step guide to migrate from CommonJS to ES Modules.
Understand how modules are resolved, specifiers, and the module algorithm.
Singleton pattern, feature flags, plugin systems, and code splitting strategies.
Optimize module loading, tree-shaking, preloading, and reduce bundle size.
Debug module issues, understand error messages, and troubleshoot common problems.
Best practices for secure module usage, avoiding vulnerabilities, and dependency management.
Practical implementations including routers, API clients, and real applications.
Official specifications, documentation, tools, learning resources, and community links.
Quick reference guide for import/export syntax with printable format.
Ready-to-use configuration files: package.json, tsconfig, vite.config, and more.
Don't just read about ES Modules - run real code in your browser!
Run real ES Module code directly in your browser. See console output, test different imports, and learn interactively.
Every example includes a one-click export to CodePen. Experiment freely, modify code, and see results instantly.
No simulations! Actual ES Modules running in isolated iframes with real browser behavior and console output.
JavaScript has evolved. The days of global namespace pollution, complex bundler configurations, and competing module formats are giving way to a standardized, powerful, and native solution: ES Modules. This is the future of writing clean, reusable, and performant code for the web, and ESModules.com is your definitive resource for mastering it.
Our mission is to accelerate the awareness and adoption of this critical technology. We believe that a deep understanding of ES Modules is no longer optional - it's a foundational skill for modern developers committed to continuous learning and building for the long term.
This site isn't just a collection of documentation; it's a living project built from real-world experience. The team at RJL.dev - a group of practicing software engineers and architects - created and actively maintains every piece of content you'll find here. We've navigated the challenges, debugged the tricky edge cases, and optimized the patterns so you can learn from our expertise.
Because we are in the trenches coding every day, we stand behind our content with confidence. We are committed to providing you with:
Clear, step-by-step guides that take you from foundational concepts to advanced techniques.
Go beyond the syntax to learn the patterns and strategies for writing truly maintainable and scalable modular code.
Real-world, copy-paste-ready snippets that solve common problems and illustrate key principles.
Learn how to diagnose and fix module resolution errors, circular dependencies, and other common pitfalls.
A handpicked collection of the best tools, articles, and documentation from around the web to supplement your learning.
ESModules.com is more than a website; it's our commitment to elevating the JavaScript community. We invite you to dive in, explore the resources, and join us in building the future of the web - one module at a time.
Quick answers to common ES Modules questions
Have questions or want to learn more about ES Modules?
