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.
18 playbooks · 509 guides · 96 articles · 13 linked practice labs ·skip to practice
Fast pattern recognition for the production failures engineers see most often.
18 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 SQS Messages Going to DLQ: Root Causes and Fixes
Troubleshoot why SQS messages are routed to dead-letter queues. Covers redrive policy misconfig, consumer timeouts, payload issues, and IAM pitfalls with concrete debugging steps.
Debugging Elasticsearch Slow Queries: From Shard Contention to Circuit Breakers
A field guide to diagnosing and fixing Elasticsearch slow queries, covering shard contention, hot threads, circuit breakers, and real-world mitigation strategies.
Elasticsearch Yellow Cluster: Unassigned Shards Deep Debug
A focused guide for diagnosing yellow cluster status caused by unassigned shards, covering allocation explain, disk thresholds, and node recovery.
GraphQL Subscription Not Receiving Events: A Field Guide to Silent Failures
Debug why your GraphQL subscription stops receiving events. Covers transport, resolver, and infrastructure causes with concrete commands.
Debugging GraphQL Schema Stitching Federation Errors
A hands-on guide to diagnosing and fixing schema stitching and federation errors in GraphQL microservices, covering type conflicts, directive mismatches, and gateway misconfigurations.
Detached DOM Tree Memory Leak: Hunting Ghost Nodes in the Browser
A production debugging guide for browser detached DOM node memory leaks: how to find them, fix them, and prevent them in React/Angular/Vanilla JS apps.
Long-form thinking on debugging habits, observability, and the systems around the bug.
Five Debugging Habits That Separate Seniors from Juniors
It's not tools. It's not years of experience. It's five repeatable habits that senior engineers do reflexively and juniors haven't built yet.
Why Your Production Logs Are Lying to You
Logs tell you what the code reported. They almost never tell you what actually happened. Here is the gap, and how to close it.
The Real Cost of Console.log Debugging (and What to Use Instead)
Every engineer reaches for console.log. Most do not think about what it costs — in time, in performance, or in production readiness. Here is the honest accounting.
Interpreting Stack Traces: Practical Steps for Faster Debugging
Stack traces can be dense, but reading them fluently accelerates triage and root cause analysis. This article explains how to extract actionable information, with real-world context.
Efficient Debugging with git bisect: Going Beyond Binary Search
This article explains how to incorporate git bisect into your debugging workflow, focusing on practical execution, automation, and common edge cases.
Applying Rubber Duck Debugging to Complex Engineering Problems
Rubber duck debugging isn’t just a quirky solo exercise. I’ll show how explaining code out loud surfaces misunderstandings and reduces wasted team cycles.