Technology

Your MacBook says 18GB Unified Memory. Your colleague's laptop says 16GB DDR5. Which one actually gives you more headroom for development? Here's the plain-English breakdown.

ERR_REQUIRE_ESM. Missing extensions. No __dirname. The ESM/CJS war is still breaking Node.js projects in 2026. Here's the root cause, all five errors you'll hit, and the exact fixes for each one.

A slow MongoDB + Node.js API was taking 15 minutes to return 8,000 records. Here's the exact process I used to diagnose it — missing indexes, in-memory aggregation, no pagination — and bring it down to 15 seconds.

Every JavaScript developer has written await Promise.all(items.map(async item =>...)). It works — until you hit a rate-limited API, a paginated async generator, or a ReadableStream. Array.fromAsync() is the purpose-built replacement you didn't know you needed.

Reactive forms were the right solution for 2018. Angular 21 ships Signal-based Forms — no valueChanges, no async pipe, no subscription management. Here's how to replace ReactiveFormsModule in every new component you write.

You split your backend into separate repos. Now you have twelve repos, nine package.json files with slightly different dependency versions, four copies of your validation utils, and six CI pipelines to coordinate for one feature. Here's the monorepo setup that actually works.

You cast the API response to `any` to stop TypeScript complaining. It worked. Now a field changed shape three months later and the bug is in production. Here's how to type messy API responses properly — with real validation, not just type assertions.

Every commit on my client's project showed sandeep@personal.com. Two weeks of commits. The wrong email. I didn't know it was happening. Here's the fix I set up that night — and haven't thought about since.

You changed assert to with and everything worked again — but you have no idea why the syntax changed, whether it's safe to use, or what happens in environments that still expect assert. Here's the full story, the exact migration, and every edge case that will trip you up.

Your Node.js server runs fine for days. Then memory climbs past 800MB, then 1.2GB, then the process restarts. That's not a capacity problem — that's a memory leak. Here's how to find it before it finds you.

You open DevTools, check the console, inspect an element, close it. But DevTools is not a debugger — it's a full developer environment. Here's the power you're leaving on the table.