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.
Debugging Webhook Delivery Failures: What the Logs Don't Tell You
HTTP 200 doesn't mean your webhook was processed. A practical guide to the network and middleware layers that silently drop webhooks.
Debugging HTTP Headers with curl: From Basic Flags to Packet-Level Inspection
A practical guide to inspecting HTTP request and response headers with curl, covering basic flags, debugging tricky issues, and understanding what your headers are really doing.
Debugging WebSocket Real-Time Features: Packet Loss, Reconnect Storms, and Silent Failures
WebSocket debugging goes beyond console.log. I cover packet capture with tcpdump, reconnect backoff strategies, and a war story about a silent failure that took down a production chat feature.
Rest API Design Mistakes That Inject Bugs Into Your System
Most API bugs aren't in the implementation—they're baked into the contract. Here are the design errors I've seen cause the most production incidents.
Blameless Postmortems: How We Fixed Root Causes Without Firing Anyone
A practical guide to running postmortems that focus on systemic failures, not individual mistakes. Includes a real incident breakdown from a production database outage.
Chaos Engineering at 3 AM: When Our Kubernetes Cluster Lost Its DNS
We ran a chaos experiment on our Kubernetes cluster and found a subtle DNS misconfiguration that would have caused a cascading failure. Here's how we did it and what we learned.