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.
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Structured investigations for the failure modes engineers meet in real systems.
Diagnosing and Resolving Next.js Server Action Errors
Pinpoint and fix errors in Next.js server actions, focusing on non-obvious causes like serialization and environment mismatches.
React Custom Hook Stale Closure State Bugs
Advanced guide to debugging and fixing stale closure issues in React custom hooks, with real stack traces, code examples, and actionable steps.
Diagnosing Next.js Dynamic Import SSR Failures
Resolve Next.js SSR crashes caused by dynamic imports. Understand misconfigurations, hydrate mismatches, and JavaScript execution pitfalls in server contexts.
Debugging Next.js Streaming SSR: Stuck, Broken, or Incomplete Streams
Identify and resolve non-obvious Next.js streaming SSR bugs: hung responses, incomplete HTML, or silent server errors. Includes war stories and concrete tactics.
Diagnosing React's Controlled vs. Uncontrolled Component Warning
How to debug and resolve React's controlled/uncontrolled component warning, why it happens, and what to check when your inputs act weird.
next.js revalidatePath Not Refreshing Cache on Dynamic Routes
next.js revalidatePath sometimes fails to refresh cache, especially on dynamic routes. This guide covers real causes, debugging, and practical fixes.
Long-form thinking on debugging habits, observability, and the systems around the bug.
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.
Using Breakpoints Effectively: Beyond Step and Continue
Most engineers know F9 to set a breakpoint and F5 to run. But breakpoints have hidden superpowers — conditional, logpoint, hit-count, and data breakpoints — that can cut debugging time in half. Here's how to use them with real examples.
Conditional Breakpoints: When and How to Use Them Beyond the Basics
Conditional breakpoints stop only when a specific condition is true, reducing noise in loops and high-frequency code. Here's how to wield them in Chrome DevTools, VS Code, and IntelliJ, plus a war story about a subtle race condition.
Debugging Character Encoding Problems: From Gibberish to Unicode
A practical guide to identifying and fixing character encoding problems, from broken UTF-8 to hidden BOM bytes, with real debugging examples.