Blocking vs Non-Blocking Code in Node.js

Short summary

Node.js solves thread starvation with non-blocking I/O: file reads and database calls hand off to the OS while the thread immediately continues handling other requests. Blocking code freezes the entire thread until an operation finishes; non-blocking code registers a callback and keeps moving. This pattern allows a single Node.js thread to handle thousands of concurrent requests, vastly more efficient than multi-threaded servers.

• •Blocking code freezes the thread; non-blocking code registers callbacks and continues immediately
• •Node.js handles thousands of concurrent requests with a single thread, avoiding memory overhead of spawning one thread per request
• •Understanding blocking vs non-blocking is essential for building scalable backend systems

Generated with AI, which can make mistakes.