nodejs

Pass and access Node.js command line arguments with process.argv. Examples for positional args, path resolution, validation, and when to use minimist or yargs.

Learn what the npm install --save flag does: how it records packages in package.json dependencies, how npm 5+ changed behavior and when to use --save-dev.

Learn how to implement JWT token invalidation in Node.js applications with Socket.io integration. Explore different approaches and security considerations.

Learn how to run Node.js applications as background services using PM2, forever, systemd, and nohup. Cross-platform solutions for production deployments.

Return 404 Not Found for GET /api/{id} when the requested REST resource doesn't exist. Include a concise JSON error body. Use 200 for empty collections.

Handle SIGINT gracefully in Node.js TypeScript CLI apps using Commander.js. Finish database updates, per-item calculations, flush stdout/stderr logs, and ensure shell prompt returns only after complete shutdown—no more lost logs or early prompts.

Fix Express.js routes returning undefined from Mongoose. Use async/await or .then() with try/catch so res.json sends findById result after promise resolves.

Learn how to resolve the 'Unknown file extension .ts' error when running Apollo GraphQL Server with Prisma in a Turborepo monorepo. Complete guide with ts-node solutions.

Learn why Puppeteer-core keyboard press Enter fails on Replit and Koyeb despite console logs. Solutions for triggering buttons with keyboard events in Node.js applications.