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.
How to Read Error Messages: A Debugging Protocol
Most engineers skim error messages and miss the signal. Here's a repeatable protocol for extracting maximum information from stack traces, log lines, and crash dumps — with a real incident walkthrough.
When to Escalate a Bug: A Decision Framework for Junior and Mid-Level Engineers
A practical framework for junior and mid-level engineers to decide when to escalate a bug, with real-world examples and criteria beyond time spent.
Debugging vs. Firefighting: Why Treating Production Incidents as Debugging Sessions Fails
When production goes down, your brain wants to debug. That instinct costs you hours. Here's why firefighting requires a fundamentally different approach, and the specific process I use to switch modes.
Writing an Incident Runbook That Actually Gets Used in Production
A runbook isn't a document—it's a tool. Here's how to write one that reduces MTTR and doesn't embarrass you during the next PagerDuty alert.
Debugging a production incident with your boss on Slack: staying rational when everything is on fire
A personal account of debugging a cascading Redis failure while the VP of Engineering watched, and the mental models that kept the fix from turning into a rollback.
Reading Distributed Traces to Find Latency: A Field Guide
Tracing tools generate a firehose of data. Here's how to filter the signal from the noise and actually find the root cause of high latency.