test

hallo

test

article

Hydration failed because the server rendered HTML didn't match the client. As a result this tree will be regenerated on the client. This can happen if a SSR-ed Client Component used:

  • A server/client branch if (typeof window !== 'undefined').
  • Variable input such as Date.now() or Math.random() which changes each time it's called.
  • Date formatting in a user's locale which doesn't match the server.
  • External changing data without sending a snapshot of it along with the HTML.
  • Invalid HTML tag nesting.

It can also happen if the client has a browser extension installed which messes with the HTML before React loaded.

const test = "JavaScript" return new function() { return { "Yo": "Read Copilot" } }

© 2025 Read Copilot. All rights reserved.