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 'this' Being Undefined in JavaScript
A practical guide to diagnosing and fixing 'this' binding errors where this is undefined in JavaScript, covering async callbacks, class methods, and strict mode.
TypeScript Function Overload Resolution: Fixing 'No Matching Signature' Errors
A focused guide to resolving TypeScript's 'No matching signature' error during function overload resolution, covering advanced patterns and real-world debugging tactics.
JavaScript Regex Catastrophic Backtracking Debug Guide
Diagnose and fix catastrophic backtracking in JavaScript regular expressions. Real commands, specific patterns, and a real incident story.
Debugging JavaScript NaN Comparison: Why NaN === NaN is False
A practical guide to understanding why NaN comparisons always return false in JavaScript, with real debugging steps and fixes.
Why Optional Chaining Returns Unexpected Undefined
A debugging guide for when optional chaining (?.) unexpectedly returns undefined instead of the expected value or error.
TypeScript Partial/Omit/Pick Type Errors: When Utility Types Fail at Scale
Debugging type errors with Partial, Omit, and Pick in TypeScript — real causes, concrete fix patterns, and a war story from a production codebase.
Long-form thinking on debugging habits, observability, and the systems around the bug.
The Debugging Mindset: A Systematic Method for Finding Root Causes
A repeatable, hypothesis-driven approach to debugging that works for intermittent failures, performance regressions, and production incidents.
Analyzing a Core Dump: What to Do When Your Process Goes Silent
A core dump is your process's last scream. Here's how to make it talk.
Timeouts Every Engineer Gets Wrong (and How to Fix Them)
Most timeout bugs aren't logic errors — they're configuration failures. Here's how to stop treating timeouts as magic numbers and start engineering them deliberately.
Backpressure in Streaming Systems: When Your Pipeline Fights Back
Backpressure is the system's way of saying 'slow down.' Ignore it and you get OOM crashes, silent data loss, or cascading failures. Here's how to design for it.
Finding Memory Leaks Step by Step: A Systematic Approach
Memory leaks are the silent killers of long-running services. Here's a repeatable process to hunt them down, from heap dumps to production monitoring.