At this level, individuals have a basic understanding of what Node.js is and its purpose. They are familiar with JavaScript and the concept of server-side scripting. They also have an awareness of asynchronous programming but may not be able to apply it in practice yet.

Novices can install and setup Node.js, understand its architecture, and know how to use basic modules. They can create simple servers using Node.js and have a basic understanding of NPM. They are also capable of handling basic errors in Node.js.

Intermediate users are proficient in JavaScript ES6+ features and understand the Express.js framework. They can build RESTful APIs using Node.js and understand middleware, non-blocking I/O operations, and Node.js streams. They also have experience with database integration and testing frameworks like Mocha or Jest.

Advanced users can build complex applications using Node.js and understand advanced design patterns. They have experience with real-time communication using Socket.IO and advanced error handling and debugging. They understand security best practices, deployment, performance tuning, and microservices architecture in Node.js.

Experts have a deep understanding of Node.js internals and can optimize it for high-performance applications. They have experience with large-scale, production-grade Node.js applications and are proficient in advanced topics like clustering, child processes, and worker threads. They can contribute to the Node.js open-source community and stay updated with emerging trends and technologies.