I'm working on a fairly complex web app and I always end up spending hours hunting down stupid bugs. I use Chrome DevTools but I feel like I'm missing something important. What tricks do you guys use to debug efficiently?
One thing nobody mentions is using the Network tab in parallel. You often think your JavaScript is buggy when actually the problem is that an API call failed silently or returned weird data. Always check your backend responses before digging into your front-end code - it'll save you hours.
As for the rest, the real trick is learning to read the stack trace. When an error pops up, don't just look at where it says "error here," but trace the chain of calls that caused it. Often the actual source of the bug is two or three levels higher up in the call stack. And if you use TypeScript or a decent linter, you'll already catch most issues before you even start debugging.
How many console.log() statements are you throwing into your code before you realize Chrome DevTools already has everything you need?
The real shift in perspective is stopping thinking of debugging as some desperate treasure hunt. Chrome DevTools has Sources, which lets you set actual breakpoints - not just "print this value and hope" - and step through your code line by line. The thing people don't use nearly enough is watching specific variables, so you can see in real time what changes as the code runs. Then there's the console drawer that's always right there, perfect for quick checks without interrupting execution.
Another thing that's saved me countless times: using the Network tab not just to see if requests are going out, but to check exactly what you're getting back from the server. I've spent hours debugging logic that was actually a problem with the data coming in. If the app is complex and has internal state, Vue DevTools or React DevTools (depending on what you're using) are killer - you see the state mutating in real time and jump back to previous states. It's not magic, it's just that people often don't know those things exist.
Oh, and one last thing that's obvious but true: set conditional breakpoints. You don't always want to stop on a line, you want to stop only when a certain variable has a certain value. At least you save yourself from clicking "continue" a thousand times.
Don't waste time randomly placing breakpoints in functions; instead, use Chrome DevTools Conditions to make execution stop only when a variable reaches a specific value - it completely changes how you track down bugs in complex apps. And when you're dealing with an error that seems random, the Network tab often reveals what you can't see in the code, like race conditions or malformed API responses.
When you start debugging, how many breakpoints do you set before realizing the problem is probably somewhere else?
What's often missing is a systematic approach. Chrome DevTools is incredibly powerful but a lot of people only use console.log and classic breakpoints. Try conditional breakpoints: right-click on the line of code, choose "Add conditional breakpoint" and write the condition you care about. Like, a breakpoint that only triggers when `user.id === undefined` instead of stopping you every time. Then use Logpoints (similar, but prints a message without halting execution) when you need to trace values without breaking the flow.
Here's a trick not many people know: in the Network tab of DevTools, you can filter and see exactly what's going wrong with your requests. If the app's acting weird, often the problem is that a request isn't what you think it is or the response is malformed. Also use the Performance tab if you suspect lag: record what happens and see where the code actually slows down. Finally, learn to use Watch expressions: in the Scope section, add the variables you care about and watch them update in real time as you step through the code. Saves you a ton of pointless console logs.
Log into answer.
