Quick Answer
Node.js handles concurrency through non-blocking async I/O, not threading. Keep I/O async (no sync calls), use connection pooling for databases, cache hot data in Redis, cluster across all CPU cores, and profile the event loop for blocking operations. For CPU-heavy work, offload to worker threads or external services.
Answer
Node optimizes concurrency using the non-blocking event loop, internal thread pool, keep-alive agents, and efficient memory handling. Scaling further requires clustering, load balancers, event-driven design, and stream-based processing.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
