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 Next.js App Router Layout Not Rendering
How to debug and fix the issue where your Next.js App Router layout component fails to render as expected.
Why Your React Error Boundary Isn’t Catching Errors
Pinpoint why your React error boundaries fail to catch component errors, including async mistakes, event handler pitfalls, and rendering issues.
Diagnosing Next.js Custom Webpack Config Failures
Understand and resolve Next.js custom Webpack configuration errors with this focused debugging guide. Fix cryptic build failures and get back to shipping.
Debugging React Lazy: 'Loading Chunk Failed' in Suspense Lazy Components
A real-world, engineer-tested debugging guide for diagnosing and resolving React's 'Loading Chunk Failed' error with lazy-loaded components and Suspense.
Next.js Server Component Incorrectly Using Client Hooks
Diagnose and fix the common pitfall of using React client-only hooks in Next.js server components, including boundary errors and misconfiguration traps.
Zustand Persist Middleware Not Saving or Loading State
How to diagnose and fix persistent state bugs with Zustand's persist middleware in React. Get concrete steps, real root causes, and effective solutions.
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.