Black box recorder for your app
Day 96 of 149
👉 Full deep-dive with code examples
The Black Box Analogy
Airplanes have black boxes that record everything that happens:
- Every action taken
- Every system reading
- Every event
After a crash, investigators know EXACTLY what happened.
Logging is your app's black box!
What Logs Look Like
[Dec 24 10:15:30] INFO User john@email.com logged in
[Dec 24 10:15:32] INFO User viewed product #12345
[Dec 24 10:15:45] ERROR Payment failed: Card declined
[Dec 24 10:15:45] INFO User redirected to payment retry
Every line tells a story!
Log Levels
| Level | Meaning |
|---|---|
| DEBUG | Developer details |
| INFO | Normal operations |
| WARN | Something concerning |
| ERROR | Something failed |
| FATAL | App can't continue |
Why It Matters
Without logs: "Something broke yesterday, no idea what."
With logs: "At 3pm, the database connection failed because..."
Logs are your time machine for debugging!
In One Sentence
Logging records application events so you can understand what happened when things go wrong.
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