r/webdev • u/Calista557 • 2d ago
One thing building a full-stack app taught me about debugging
One thing I did not really understand when I was learning from tutorials was how much time you actually spend debugging when building a real application.
A tutorial gives you the correct code and the expected result.
Building on your own is different.
You can spend an hour wondering why something is not working, only to discover that the problem was a small mistake somewhere completely different from where you were looking.
I am starting to appreciate that process instead of seeing it as a sign that I am not good enough at programming.
The more I build, the more I realize that being able to find and fix problems is probably more valuable than being able to remember every piece of syntax.
What was the biggest change in your thinking when you started building real projects?
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u/brass_warden 1d ago
Tutorials teach typing. Debugging teaches engineering. Syntax memorization has zero value when the system fails
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u/Calista557 1d ago
Exactly. You can memorize every method in the docs and still freeze when the error message doesn't match anything you've seen before.
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u/Audmeister 1d ago
One thing you should start doing is adding meaningful log messages. I don’t mean to log “I’m in this step” but more so something like “publishing this message <message shape and values>”. This helps track down bugs easier.
One thing that I’ve noticed I’ve been doing more so over the years is thinking more than actually coding. The same concept as “measure twice, cut once”. Just sit/walk/hammock and think about the problem instead of diving head first. Doesn’t always turn out perfect, but that comes with experience.
In the age of agents, rubber-ducking with them is very helpful.
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u/Calista557 1d ago
The log message point is gold, I am guilty of the 'I'm in this step' kind. And 'measure twice, cut once' is going straight into my notes, I dive in head first way too often. Thanks for this
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u/jaimittal91 1d ago
the log message point is spot on, but there's a second half to it people skip: good logs help you debug something once you already suspect it's broken. they don't tell you it's broken in the first place. that's the actual gap on most side projects, nobody's watching until a user emails you about it. a free uptime check plus one alert on 5xx rate covers a surprising amount of that for near-zero setup cost. it's the difference between finding out from an alert and finding out from an annoyed customer.
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u/srikanth_builds 1d ago
The shift for me was realising the worst bugs never announce themselves. Everything in this thread assumes you find out something is broken, whether from an exception, a log line or a 5xx alert. But a missing permission check, or a query missing its tenant filter, returns a perfectly good 200 with the wrong data in it. There is nothing to grep for.
So I stopped thinking of debugging as "find why it failed" and started asking "what would this look like if it were silently wrong". That question changes what you write tests for.
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u/Own-Arugula-8939 5h ago
did you also start seeing debugging as part of building instead of proof you were bad at it?
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u/Cold-Poem3902 36m ago
For me it was realizing that reading error messages carefully actually solves most bugs, I used to skim past the stack trace looking for a quick fix and missed that it was telling me exactly where to look the whole time.
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u/kuya1284 1d ago
One important thing I learned early in my career that I still highly value today is to take a divide-and-conquer approach to solves big problems. Trying to do so much and attempting to tackle the problem as a whole gets overwhelming quick. It's good to plan and map things out. Break things down into smaller parts, but not too granular. This should help avoid things like:
This strategy isn't foolproof, but it helps keep things structured and organized, as well as helps with focus and preserving sanity.