Buglyst Blog
Learn to debug under pressure.
Playbooks for fast pattern recognition, guides for the full investigation, and articles for the engineering judgment around the edges.
17 playbooks · 509 guides · 95 articles · 12 linked practice labs ·skip to practice
Fast pattern recognition for the production failures engineers see most often.
17 playbooks
Debugging Env Var Issues
A concise checklist for incidents where local works but CI, staging, or production changes behavior.
Debugging Cache Stampedes
How to recognize and contain request spikes when cached data expires.
Debugging CORS Origin Bugs
A practical way to inspect origin parsing, credentials, and header behavior.
Debugging Retry Bugs
Retry issues often hide the first failure and create duplicate work.
Debugging Timezone Bugs
Time bugs usually live at day boundaries, DST changes, and unit conversions.
Debugging Pagination Bugs
Pagination bugs hide in boundary math, cursor reuse, and new records arriving between pages.
Structured investigations for the failure modes engineers meet in real systems.
Debugging 'JWT Invalid Signature' Failures in Production
JWT invalid signature errors often stem from key mismatches, encoding quirks, or unnoticed library pitfalls. This guide details concrete, real-world debugging steps.
Debugging UnhandledPromiseRejection in Node.js Applications
How to identify, isolate, and fix UnhandledPromiseRejection warnings in Node.js, with specific steps and sample incidents.
Diagnosing and Fixing Next.js Build Failures
A practical guide to debugging Next.js build errors, with actionable steps, overlooked root causes, and real-world war stories.
Diagnosing Silent Failures and Deadlocks in Python Asyncio
A precise engineering guide for tracking down deadlocks, silent failures, and missed awaits in Python asyncio — beyond the usual print debugging.
Diagnosing Broken Networking in Docker Containers
A practical guide for tracking down and fixing broken networking between Docker containers, with real commands, root causes, and verification steps.
Diagnosing React Context Unnecessary Re-renders Impacting Performance
React Context misuse can silently trigger excess renders in deeply nested trees. Learn how to spot, diagnose, and fix these performance killers.
Long-form thinking on debugging habits, observability, and the systems around the bug.
Debugging CSS Layout Issues: A Systematic Approach to Fixing Broken Layouts
A practical, step-by-step system for diagnosing and fixing CSS layout bugs — from overflow and collapsing margins to flexbox and grid misbehavior. Includes real DevTools workflows and a war story from production.
Debugging Accessibility Violations: A Systematic Approach from Audit to Fix
A practical guide to identifying, triaging, and fixing accessibility violations in web applications, covering automated tools, manual testing techniques, and common pitfalls.
Find the Real Cause of a Slow Page: A Profiling Protocol for Engineers
A practical protocol for profiling web page performance — not a list of metrics, but a repeatable process for finding what actually slows down your users.
Tracking Down Memory Leaks in Browser JavaScript: A Practical Field Guide
Memory leaks in the browser are subtle and hard to reproduce. This guide covers practical techniques to detect, isolate, and fix them using Chrome DevTools, heap snapshots, and allocation timelines.
Why Your 60fps Animation Stutters: A Deep Dive Into the Browser Event Loop
The event loop isn't just about callbacks. It's about when and in what order the browser processes tasks, microtasks, and rendering. Here's what actually happens between frames.
Remote Debugging Mobile Devices at Scale: What Works and What Doesn't
Setting up remote debugging for iOS and Android devices involves more than just enabling Developer Mode. Here's what I've learned from debugging over 500 devices in production.