Q1. How is Node.js different from traditional web servers like Apache?
Traditional servers like Apache create a new thread for each request, which consumes more memory and can lead to thread management overhead. Node.js uses a single-threaded event loop that handles multiple concurrent requests without creating new threads, making it more memory-efficient and scalable for I/O-heavy applications.
Q2. What are the advantages of Node.js over traditional servers?
Node.js offers better performance for I/O-intensive applications due to its non-blocking nature. It uses less memory because it doesn't create threads per request. Development is faster since you use JavaScript on both client and server. The npm ecosystem provides millions of packages. It's ideal for real-time applications like chat and gaming.
Q3. When should you choose Node.js over traditional servers?
Choose Node.js for I/O-intensive applications like real-time services (chat, live updates), APIs, streaming services, and microservices. Traditional servers might be better for CPU-intensive applications (image processing, video encoding) because Node.js's single thread can get blocked. For static content, both work well.
Q4. What are the limitations of Node.js compared to traditional servers?
Node.js isn't ideal for CPU-intensive tasks because heavy computation can block the event loop. The single-threaded nature can be a bottleneck for CPU-heavy operations. Error handling in async code can be complex. Compared to multi-threaded servers, Node.js might not utilize multi-core CPUs as efficiently without clustering.
Q5. How does Node.js handle concurrency differently?
Traditional servers handle concurrency by creating multiple threads, each handling one request. Node.js handles concurrency through its event loop and non-blocking I/O. A single thread can handle thousands of concurrent connections by delegating I/O operations and processing callbacks when operations complete, without waiting for each to finish.