Rendering errors

Rendering errors usually involve hydration, markup mismatches, or server/client output divergence in UI frameworks.

These pages help users compare related error messages, common causes, and how-to-fix steps across different tools that fail in the same way.

Rendering errors are especially search-driven because users often paste the exact hydration or markup mismatch text into a search engine while trying to understand whether the issue is server rendering, client rendering, data timing, or component behavior.

This hub keeps rendering-related failures across UI frameworks together so users can compare common patterns behind mismatched output, hydration warnings, and server-client divergence.

Next.js React

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No async Client Component

Next.js client component cannot be asyncNext.js

createContext in a Server Component

Next.js createContext used in a Server ComponentNext.js

Missing Root Layout tags

Next.js root layout is missing html or body tagsNext.js

React error #448

React createPortal was called on the serverReact

React error #449

React flushSync was called on the serverReact