Frontend debugging scenarios
Comes up in: Debugging, Web fundamentals
This concept is being written. It gets the full five steps — explanation, predict, interview angle, practice with tests, and review cards. Here is exactly what it will cover, so you can study it elsewhere in the meantime.
What it covers
- white screen after deploy (chunk load errors, cache, CSP)
- memory leak growing over hours
- INP regression
- only Safari breaks
- works locally but not in prod (env, CORS, cookies)
- hydration errors in SSR
- intermittent test failures
- third-party script slowdowns
Words you will know
What you will practise
- 8 scenario drills (timed, rubric)
Interview questions this answers
- Users report a blank page after today's deploy. What do you do?
- Memory use grows over a few hours in our SPA. How do you find the cause?
- A feature works locally but fails in production. How do you investigate?
- Our INP got worse last week. How do you find what changed?