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.
React Custom Hook Stale Closure State Bugs
Advanced guide to debugging and fixing stale closure issues in React custom hooks, with real stack traces, code examples, and actionable steps.
Diagnosing Hidden Performance Bottlenecks in React Apps
Cut through noise and pinpoint real React performance issues. This guide details actionable profiling, interpretation, and advanced optimization techniques.
Diagnosing Next.js Dynamic Import SSR Failures
Resolve Next.js SSR crashes caused by dynamic imports. Understand misconfigurations, hydrate mismatches, and JavaScript execution pitfalls in server contexts.
Debugging Next.js Streaming SSR: Stuck, Broken, or Incomplete Streams
Identify and resolve non-obvious Next.js streaming SSR bugs: hung responses, incomplete HTML, or silent server errors. Includes war stories and concrete tactics.
Diagnosing Next.js Authentication Cookies Not Being Set
Authentication cookies not set in Next.js apps are usually caused by subtle server/client config mismatches. Here’s how to track down and fix the real issue.
Diagnosing React's Controlled vs. Uncontrolled Component Warning
How to debug and resolve React's controlled/uncontrolled component warning, why it happens, and what to check when your inputs act weird.
Long-form thinking on debugging habits, observability, and the systems around the bug.
Logs, Traces, and the Lies They Tell: Debugging a Stuck Queue in Production
A single stuck queue brought down an entire checkout flow. Here's how we traced the failure across services, what the logs didn't say, and the tools that finally showed the truth.
Pair Debugging: How to Debug Together Without Killing Each Other
Pair debugging sounds great on paper. In practice, it's easy to step on each other's toes, go silent, or fight over the keyboard. Here's how to make it work.
Debugging with AI Tools: What Worked and What Didn't in Production
After a year of using GPT-4, Copilot, and Claude to hunt production bugs, here's what actually helped — and what sent me down dead ends.
How to Debug Legacy Code Without Losing Your Mind
A pragmatic approach to debugging code you didn't write, with techniques for tracing execution, isolating side effects, and making safe edits.
Debugging Feature Flag Rollouts: Tracing the Live-at-5 Incident
A misconfigured feature flag triggered a cascading failure in production. Here's how we traced the root cause and built a better debugging toolkit.
How to Ask for Debugging Help Without Wasting Everyone's Time
Asking for debugging help is a skill. Here's how to provide enough context, show your work, and frame the problem so others can actually help you.