Debugging & Fixing with Claude Code

Claude debugs faster than humans because it reads context faster than humans. Show it the error, show it the file, watch it root-cause. The trick is knowing what to show it — and that's what this lesson teaches.

Learning Objectives

After this lesson, you will be able to:

Use Claude Code to quickly diagnose errors from stack traces, build failures, and crashes
Fix linting errors across your entire codebase in one pass
Refactor code safely using Claude Code's read-edit-test loop -- change the structure without breaking behavior
Find and fix slow code by asking Claude Code to analyze performance bottlenecks

Prerequisites

Before You Start

Review

Why

Why This Matters

Debugging is where Claude Code saves the most time -- reading stack traces, tracing through code paths, and identifying root causes can take a developer 30-60 minutes; Claude Code often finds the bug in under 2 minutes because it can read and cross-reference files at machine speed
Error messages become actionable instantly -- paste a cryptic error message and Claude Code decodes it, finds the relevant code, identifies the root cause, and writes the fix; no more googling error messages and reading Stack Overflow
Refactoring with confidence -- Claude Code can refactor code and immediately run tests to verify nothing broke; this read-edit-test loop is the safest way to make changes to working code
Build this --> Debug a real error by pasting a stack trace into Claude Code and watching it trace through the code to the root cause and fix

#The Debugging Workflow

Debugging is often the most frustrating part of programming -- staring at an error, reading through files, trying to figure out what went wrong. Claude Code turns that frustration into a 2-minute conversation. This lesson shows you exactly how to feed errors to Claude Code for maximum speed.

Debugging & Fixing with Claude Code

After this lesson, you will be able to:

Before You Start

#The Debugging Workflow

Your Reflection

Continue Learning

Discussion

#Step 1: Paste the Error

#Step 2: Provide Context (If Needed)

#Step 3: Verify the Fix

#Common Debugging Scenarios

#Refactoring Without Breaking Things

#Safe Refactoring Prompts

#Debugging Production Issues: A Case Study

Claude Code

Deep Dive

#Key Takeaways

#Quick Check