OpenTelemetry in Node.js: production traces that help
OpenTelemetry in Node.js with HTTP, Express or Fastify, pg, Prisma, Redis, request IDs, trace propagation, sampling, and the incident view that matters.
Common Node.js errors · quick reference
All error fixes →| Error | What it means / fix |
|---|---|
| UnhandledPromise | Express.js async error handling that actually works in 2026 Express.js async error handling that actually works in 2026: Express 5 native catching, the express-async-errors patch for legacy apps, typed error classes, and the Sentry integration that survives a bad deploy. |
| MODULE_NOT_FOUND | Fix “Cannot find module” in Node.js (CommonJS, ES modules, TypeScript) Fix Cannot find module in Node.js: CommonJS vs ESM resolution rules, TypeScript path aliases at runtime, file case-sensitivity, monorepo workspace pitfalls, and the diagnostic tree I hand new engineers. |
| EADDRINUSE | Fix EADDRINUSE: address already in use in Node.js (Mac, Linux, Windows) Fix EADDRINUSE: address already in use in Node.js on Mac, Linux, and Windows. The kill commands per OS, the TIME_WAIT trap, graceful shutdown, and how to stop it from coming back. |
Tutorials & how-tos
All tutorials →
WebSockets in Node.js with Socket.io: a real-time chat that scales past one server
GraphQL in Node.js with Apollo Server in 2026: the setup I’d ship to a paying client
Cron jobs in Node.js: the scheduling patterns I trust in production
Testing a Node.js API in 2026: Jest, Vitest, and the suite I actually trust
Comparisons & benchmarks
All comparisons →
Sequelize vs Prisma vs TypeORM in 2026: the Node.js ORM benchmark and the pick I’d make
I've shipped APIs on all three. Sequelize from 2017 to 2020 on a payments API that's still in production. TypeORM through 2021 on a logistics dashboard, where the migration generator broke twice and burned a sprint each time.…
Performance & Architecture
All recipes →
Node.js
Recipe
PostgreSQL connection pooling in Node.js: the bug that shows up at scale
PostgreSQL connection pooling in Node.js with pg, Prisma, PgBouncer, serverless limits, transaction pooling traps, and the dashboard I check first.
Docker
Recipe
Node.js microservices architecture: the patterns that actually held in production
I helped a logistics startup split a Node.js monolith into seven services in 2022 and watched them spend the next eight months untangling a distributed monolith. The services…
Express
Recipe
Node.js API security in 2026: the checklist I run before pushing to prod
I leaked a logistics company’s internal API for eleven days. Not a customer-facing one — an admin endpoint that returned every shipment’s tracking number, recipient address, and carrier…
Node.js
Recipe
Node.js cluster vs worker threads: which one when (and the trap I fell into)
I had a Node.js video-processing API throwing 503s every time someone uploaded a 4K clip. The default fix everyone reaches for — cluster.fork() across cores — actually made…
Node.js
Recipe
Node.js performance optimization in 2026: the checklist I run before every launch
I rewrote a logistics-analytics Node.js API last summer that was averaging 870 ms p99 on a single endpoint. After two days of clinic.js and four targeted changes (none…
Node.js
Recipe
The Node.js event loop, explained for people who actually have to ship
I had a Node.js payment API hang for nine seconds on a single request and take down two upstream services with it. The endpoint did one thing: hash…
