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.
Node.js Crypto Module Error: Common Failures and Fixes
A practical guide to debugging Node.js crypto module errors, covering invalid key types, unsupported algorithms, and input encoding issues.
Node.js Buffer Encoding Decoding Errors: A Production Debugging Guide
Diagnose and fix Node.js buffer encoding/decoding failures with exact commands, common root causes, and a real-world incident story.
Node.js Self-Signed Certificate Error: Debugging TLS_CERTIFICATE_VERIFY_FAILED
A practical guide to diagnosing and fixing 'UNABLE_TO_VERIFY_LEAF_SIGNATURE' and 'SELF_SIGNED_CERT_IN_CHAIN' errors in Node.js HTTPS requests.
Node.js DNS Lookup Failure: How to Debug Resolution Timeouts and ENOTFOUND
A practical guide to debugging Node.js DNS resolution failures, including ENOTFOUND, EAI_AGAIN, and timeout errors in production.
Multer File Upload Not Working in Express: A Debugging Guide
A hands-on guide to debugging common Multer issues in Express applications: missing files, empty req.file, corrupted uploads, and silent failures.
Node.js Inspector Debugger: Diagnosing Protocol Disconnections and Async Breakpoints
A practical guide to debugging Node.js with the inspector protocol—covering disconnections, async stacks, and breakpoint failures.
Long-form thinking on debugging habits, observability, and the systems around the bug.
Five Debugging Habits That Separate Seniors from Juniors
It's not tools. It's not years of experience. It's five repeatable habits that senior engineers do reflexively and juniors haven't built yet.
Why Your Production Logs Are Lying to You
Logs tell you what the code reported. They almost never tell you what actually happened. Here is the gap, and how to close it.
The Real Cost of Console.log Debugging (and What to Use Instead)
Every engineer reaches for console.log. Most do not think about what it costs — in time, in performance, or in production readiness. Here is the honest accounting.
Interpreting Stack Traces: Practical Steps for Faster Debugging
Stack traces can be dense, but reading them fluently accelerates triage and root cause analysis. This article explains how to extract actionable information, with real-world context.
Efficient Debugging with git bisect: Going Beyond Binary Search
This article explains how to incorporate git bisect into your debugging workflow, focusing on practical execution, automation, and common edge cases.
Applying Rubber Duck Debugging to Complex Engineering Problems
Rubber duck debugging isn’t just a quirky solo exercise. I’ll show how explaining code out loud surfaces misunderstandings and reduces wasted team cycles.