How to Capture Console Logs From Users in Production (Safely)
Debugging production issues is hard when you don’t have access to the user’s browser. Here’s how to capture console logs safely and ethically.
One of the hardest problems in frontend debugging is this:
The bug only happens on the user’s machine.
You can’t reproduce it locally. You don’t see the error. And the user only says, “The page is blank.”
Console logs often contain the answer. But how do you access them in production?
Use Global Error Handlers
window.onerror
window.addEventListener('unhandledrejection', ...)
This helps with runtime errors but misses broader console context.
Override Console Methods
You can wrap console.log, console.error, and console.warn to:
- Store recent logs in memory
- Attach them to feedback submissions
- Send them only when users report issues
Privacy & Security
- Never collect sensitive inputs
- Never capture passwords
- Only send logs on explicit user action
Production debugging becomes dramatically easier when you can see what the user’s browser saw — just design it ethically.
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