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.
Stripe Webhook Signature Verification Failed: A Debugging Guide
Diagnose and fix Stripe webhook signature verification failures. Covers common causes like clock drift, wrong signing secret, and raw body mismatches.
OpenAI API 429 Rate Limit Error: Diagnosis and Fixes
A focused guide on diagnosing and resolving HTTP 429 rate limit errors from the OpenAI API, covering root causes, retry strategies, and monitoring.
SendGrid Email Not Delivered: Diagnosing Silent Delivery Failures
A practical guide to diagnosing why SendGrid emails are accepted but never arrive, covering SPF/DKIM, bounces, suppression lists, and IP reputation.
Debugging LangChain Chain Output Errors: A Practical Guide
A hands-on guide to debugging LangChain chain output errors, covering common causes, quick diagnosis, and fixes.
Firebase Security Rules Blocking Requests: Debugging Guide
A practical guide to debugging Firebase Security Rules that unexpectedly deny requests. Covers simulator pitfalls, missing auth tokens, and rule ordering issues.
Debugging Firebase Realtime Database Offline Sync Failures
A focused guide to diagnosing and fixing when Firebase Realtime Database fails to sync data while offline, covering local state mismatches, conflict resolution, and connectivity edge cases.
Long-form thinking on debugging habits, observability, and the systems around the bug.
How to Debug a Regression: A Practical Walkthrough
A practical, step-by-step guide to finding and fixing regression bugs, with real-world examples and concrete commands you can run today.
The Cost of Not Reproducing Bugs: Why Local Debugging Saves Hours
Skipping local reproduction leads to wasted hours, broken deploys, and frustrated teams. Here's why it's non-negotiable and how to do it right.
Debugging an Unfamiliar Codebase: A Systematic Approach
A repeatable process for debugging code you didn't write — with specific techniques, tooling choices, and a war story from a production outage at 2 AM.
5 Questions to Ask Yourself Before Filing a Bug Report
A senior engineer's pre-flight checklist for bug reports — forged in the fire of a production incident that turned a 5-minute fix into a 3-hour hunt.
Binary Search for Bugs: Cutting Down Bisection Time with git bisect run
Automating git bisect with a script turns days of manual hunting into minutes. Here's how to build a reliable bisection harness for your codebase.
Reading a Call Stack: What Each Frame Actually Tells You
A call stack shows you the path your code took to crash. But most developers only look at the top frame. Here’s how to read the whole thing — including async traces, native frames, and minified code.