Next.js Instrumentation Hook: OpenTelemetry Traces and Custom Spans (2026)
Wire OpenTelemetry into Next.js with instrumentation.ts, @vercel/otel, custom spans, and onRequestError. Real traces you can actually read in prod.
Articles by Oliver Schmidt
Next.js Bundle Analyzer: Reduce JavaScript Bundle Size in App Router (2026)
Find the heavy chunks in your Next.js app, then cut First Load JS by 30 to 60 percent. Install @next/bundle-analyzer, read the treemap, then use next/dynamic, Server Components, and optimizePackageImports to ship under 130 KB per route in Next.js 16.
React Compiler with Next.js 16: Setup, Auto-Memoization, and What to Delete from Your Code (2026)
React Compiler lands in Next.js 16 as a stable, one-flag setup. Here's how to enable it, what useMemo and useCallback calls you can finally delete, and how to verify the wins in React DevTools.