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 Node.js Cluster Module Worker Crashes
A hands-on guide to diagnosing and fixing worker crashes in Node.js cluster mode, covering uncaught exceptions, memory leaks, and IPC failures.
Debugging TypeScript Generic Type Constraint Errors
A practical guide to diagnosing and fixing TypeScript errors when generic type parameters violate their constraints, with real-world debugging strategies and a war story.
Mapped Types Returning 'never' or 'unknown' — What Your IDE Won't Tell You
A field guide for when mapped types silently collapse to 'never' or 'unknown', covering conditional checks, key remapping, and distributive conditional types.
JavaScript Closure Stale Variable Inside Loop
A debugging guide for the classic JavaScript closure-in-loop bug where callbacks capture the final value of a loop variable instead of each iteration's value.
TypeScript Discriminated Union Type Narrowing Not Working
A practical debugging guide for when TypeScript's discriminated union type narrowing fails due to common pitfalls like excess property checks, optional discriminants, and type assertions.
Debugging Prototype Chain Inheritance Bugs in JavaScript
A guide to diagnosing and fixing subtle bugs caused by shared state and unintended property shadowing in JavaScript prototype chains.
Long-form thinking on debugging habits, observability, and the systems around the bug.
Documenting Bugs: A Postmortem-Driven Approach That Cut Recurrence by 60%
Most bug write-ups are useless. Here's a structured, postmortem-driven approach that reduced bug recurrence by 60% in our team — with templates and a real incident walkthrough.
Debugging Inside Docker Containers: Tools, Techniques, and a War Story
Practical techniques for debugging inside Docker containers: exec, nsenter, strace, and a real incident that made me rethink debug images.
kubectl logs: Debugging Pods with Logs, Timestamps, and Previous Instances
Beyond `kubectl logs pod-name` — using timestamps, previous instances, and multi-container patterns to diagnose real failures.
Debugging Serverless Functions Locally: A Practical Approach
Local debugging of serverless functions requires different tools and mindset than traditional apps. Here's how I approach it with real examples.
Debugging Terraform and CloudFormation Errors: A Field Guide to the 3 AM Page
Infrastructure-as-code errors are inevitable. Here's how to systematically debug Terraform and CloudFormation failures without losing your mind.
Debugging as Hypothesis Testing: A Mental Model for Systematic Root Cause Analysis
Most debugging is frantic guessing dressed up as experience. Here's a mental model that treats debugging as a scientific process — form hypotheses, design experiments, and isolate root causes systematically.