Tag: nodejs

All the articles with the tag "nodejs".

• Node.js Diagnostic Tools — Heap Snapshots, Flame Graphs, and DoctorJS in 2026

  Posted on:January 12, 2026 |  at 10:00 AM

  The complete Node.js diagnostics toolkit for 2026: V8 heap snapshots, CPU flame graphs, Clinic.js Doctor and Flame, OpenTelemetry integration, and the new --prof-process workflow. Covers what each tool finds and when to use it.

• Python AsyncIO vs Node.js Event Loop — The Differences That Bite You

  Posted on:September 8, 2025 |  at 10:00 AM

  Both Python asyncio and Node.js use a single-threaded event loop for concurrency. But the implementation differences are significant: how coroutines suspend, blocking code behavior, thread pool integration, and the GIL's effect on async Python code.

• Node.js Memory Leaks — How I Found and Fixed a 2GB Leak in Production

  Posted on:June 16, 2025 |  at 10:00 AM

  A real case study of a Node.js API that grew to 2GB RSS and crashed weekly. Covers heap snapshot analysis, the --expose-gc flag, closure leaks, EventEmitter leaks, and the three-snapshot technique for finding what's growing.

• Building a Real-Time DEX Price Monitor with Node.js and WebSockets

  Posted on:March 17, 2025 |  at 10:00 AM

  Step-by-step guide to building a real-time DEX price monitor that listens to Uniswap V2/V3 swap events via WebSocket, decodes transaction logs, and broadcasts live price updates to connected clients. Complete TypeScript implementation with reconnection logic.

• Node.js Worker Threads — True Parallelism Without the Cluster Mess

  Posted on:December 9, 2024 |  at 10:00 AM

  Node.js Worker Threads enable true CPU parallelism in a single process. This post covers the communication model, SharedArrayBuffer for zero-copy data sharing, thread pool patterns, and benchmarks showing when Workers outperform cluster vs when they don't.

• Node.js Streams and Backpressure — Why Your File Uploads Are Slow

  Posted on:September 9, 2024 |  at 10:00 AM

  How Node.js streams work under the hood, what backpressure is and why it matters, and the specific patterns that cause slow uploads, memory bloat, and dropped data. Includes a comparison of buffered vs streaming throughput.

• Profiling Node.js with Clinic.js and DoctorJS — A Real Case Study

  Posted on:May 20, 2024 |  at 10:00 AM

  A hands-on walkthrough of Clinic.js toolchain — Doctor, Flame, and Bubbleprof — diagnosing real performance bottlenecks in a Node.js API. Includes flame graph interpretation, event loop delay analysis, and the actual code fixes.

• Node.js Event Loop Internals — What Actually Happens When You await

  Posted on:February 12, 2024 |  at 10:00 AM

  A deep dive into libuv's event loop phases — timers, I/O callbacks, poll, check, and close — explaining exactly what executes when and why. Includes microtask queue ordering, setImmediate vs setTimeout, and common pitfalls that cause production latency spikes.