119 articles
Fix ‘Cannot GET /’ error in Express — missing routes, wrong method, static files, route order, and 404 handling with clear examples.
Fix ‘SyntaxError: Unexpected token in JSON at position 0’ — HTML error pages, empty responses, wrong content type, and safe JSON parsing patterns.
Add full-text search to your app with PostgreSQL — tsvector, ranking, indexes, highlighting, and when to use Postgres search vs Elasticsearch. Full code.
Handle file uploads in Node.js — multer, validation, cloud storage with S3, presigned URLs, image processing, and security best practices. Full code.
Implement API pagination correctly — offset, cursor, and keyset pagination compared, with SQL, response format, and performance best practices.
Fix ‘No Access-Control-Allow-Origin header is present’ — server config for Express, nginx, credentials, and why the browser blocks the request.
Deploy a Next.js app to production — Vercel, Docker self-hosting, environment config, caching, and performance optimization. Full walkthrough.
Manage environment variables securely in Node.js — dotenv, validation, secrets management, and avoiding common leaks. Best practices with code.
Fix ‘Uncaught (in promise)’ errors in JavaScript — unhandled rejections, missing catch, async/await try-catch, and global handlers with examples.
Add rate limiting to a Node.js API — fixed window, sliding window, token bucket algorithms, Redis-backed limits, and per-user throttling. Full code.
