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Languages & runtimes · #nodejs
Diagnosing intermittent connection pool exhaustion in node-postgres (pg) is complicated by the fact that multiple root causes produce the same 'timeout exceeded when trying to connect' error. A leaked client (missing release) and an event-loop stall that delays release callbacks can both leave the pool empty, as can a pool size that is too small for burst co
Goal: Identify whether using the synchronous crypto.pbkdf2Sync function or its asynchronous counterpart crypto.pbkdf2 yields lower latency spikes when the server handles many concurrent requests. Constraint: The synchronous call blocks the Node.js event loop, causing all incoming requests to wait until the operation finishes, while the asynchronous call offl
Goal: Set Alerts without Notification Noise \n The sema library’s acquire() method now supports a timeout option in v2.0, but the exact rejection timing is undocumented for different Node.js LTS releases. When a timeout occurs, the returned promise should reject, yet the delay before rejection appears inconsistent, which can cause false positives or missed a
PM2 provides the max_memory_restart option to automatically reboot a process when it exceeds a specific memory threshold. This is often used as a safeguard against gradual memory leaks in Node.js applications. In a production environment using PM2 v5.x, there is uncertainty regarding which specific memory metric the process manager monitors to trigger this r
PM2 Cluster Mode utilizes the Node.js cluster module to distribute incoming connections across multiple worker processes. When the instances property is set to max in an ecosystem file, PM2 spawns a process for every logical CPU core detected on the host machine. While this maximizes CPU utilization, each worker operates as a separate process with its own me
When a Puppeteer‑driven deployment fails, developers often turn to the DEBUG logging feature to see the internal Chrome DevTools Protocol messages that Puppeteer emits. However, DEBUG output does not include console.log statements or JavaScript errors generated by the page itself; those must be captured with separate page.on('console') and page.on('pageerror
The goal is to decide whether to rely on Node.js’ built‑in perf_hooks module or on external tracing solutions such as Chrome DevTools or OpenTelemetry for production bottleneck analysis. Constraints include keeping runtime overhead low, ensuring compatibility with Node.js v8.5.0+, capturing short‑lived event‑loop spikes, and integrating with existing observa
Nodemon vs Node.js Process: Duplicate Write Concerns Goal Determine how to configure Nodemon so that the Node.js application does not produce duplicate log entries when the process restarts immediately after a file change. Constraints Nodemon triggers a restart on every detected file event, and the underlying OS file‑watcher may emit multiple rapid events fo
Node.js HTTPS Agent keepAlive in Tests When running integration tests that hit an HTTPS endpoint without using production credentials, the default keepAlive setting on the https.Agent may influence both the number of TLS handshakes and the overall test duration. The Node.js documentation states that keepAlive defaults to false , but the actual behavior can v
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