𝗛𝗼𝘄 𝘁𝗼 𝗗𝗲𝗯𝘂𝗴 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 𝗟𝗶𝗸𝗲 𝗮 𝗦𝗲𝗻𝗶𝗼𝗿 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿
Stop using console.log for everything. You waste hours every week.
I spent 8 years fixing production issues. This workflow cuts debugging time by 60%.
Tool Use Case Time Saved
- Chrome DevTools Sources Step-through debugging 40%
- Conditional Breakpoints Narrowing bugs in loops 25%
- Performance Panel Finding rendering bottlenecks 35%
- Network Panel API timing issues 30%
- Console.assert Catching logic errors early 15%
Stop sprinkling logs everywhere. Use these methods instead.
Use Conditional Breakpoints Open DevTools Sources. Click a line number to set a breakpoint. Right-click it and select Edit breakpoint. Add a condition. The debugger stops only when your condition is true. This saves hours on large loops.
Study the Call Stack When the debugger pauses, look at the Call Stack panel. It shows the path that led to the bug. Right-click a frame and select Copy stack trace to save it.
Use Log Points If you want output without stopping the code, use Log points. Right-click a line number and select Add log point. This does not change your source code. It disappears when you close DevTools.
Fix Slow Apps with Performance Panel Open the Performance tab. Click Record. Use your page for 5 seconds. Stop recording. Look for long tasks over 50ms in the Main thread. This reveals layout and painting issues.
Inspect the Network Panel Check the Waterfall view. Red or purple bars mean blocked requests. Large gaps mean JavaScript is blocking the main thread. Right-click a request and select Copy as cURL to test API issues in your terminal.
Your debugging checklist:
- Set a conditional breakpoint
- Check the Call Stack for the execution path
- Use the Scope panel for local variables
- Add a log point for monitoring values
- Record a Performance profile for timing issues
- Check the Network panel for API issues
Moving to this workflow takes two weeks to master. It is the best productivity upgrade for your career. Your browser already has these tools. Use them.
Source: https://dev.to/kui_luo/how-to-debug-javascript-like-a-senior-developer-in-2025-3d0p