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.
Hunting Down Memory Leaks Caused by Improper WeakMap/WeakSet Usage
A practical guide to diagnosing and fixing memory leaks from WeakMap/WeakSet anti-patterns in production JavaScript applications.
Debugging for-await-of Errors with Async Iterators
A senior engineer's guide to diagnosing and fixing for-await-of errors when consuming async iterators, covering common pitfalls like unhandled rejections, premature termination, and generator misconfiguration.
Debugging Unexpected State Changes from JavaScript Object Mutation
A practical guide to identifying and fixing bugs caused by unintended object mutation in JavaScript, with real-world examples and debugging strategies.
Debugging TypeScript 'satisfies' Operator Errors
A practical guide to diagnosing and resolving type errors when using the TypeScript satisfies operator, including narrowing, excess property checks, and type inference pitfalls.
Debugging TypeScript Readonly Property Violations
How to diagnose and fix readonly property violations in TypeScript, including mutation via methods, aliasing, and array/object nesting.
Debugging JavaScript Proxy Reflect Traps: When Your Proxy Silently Fails
Guide to debugging silent failures in JavaScript Proxy traps when using the Reflect API. Covers missing return values, revoked proxies, and infinite recursion.
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.