seniorReact
What is React hydration mismatch and how do you fix it?
Updated Apr 23, 2026
Short answer
Hydration mismatch occurs when server-rendered HTML differs from client-rendered output.
Deep explanation
React expects identical markup between server and client. Differences cause warnings and UI issues. Fix by ensuring consistent rendering logic and avoiding non-deterministic values like Date or random numbers.
Unlock with a Pro subscription to view this section.
View pricingReal-world example
No real-world example available yet.
Unlock with a Pro subscription to view this section.
Upgrade to ProCommon mistakes
No common mistakes listed yet.
Unlock with a Pro subscription to view this section.
Upgrade to ProFollow-up questions
No follow-up questions available yet.
Unlock with a Pro subscription to view this section.
Upgrade to Pro