[API reference](https://evolu.dev/docs/api-reference) › [@evolu/react](https://evolu.dev/docs/api-reference/react) › useIsSsr

```ts
function useIsSsr(): boolean;
```

Defined in: [local‑first/useIsSsr.ts:11](https://github.com/evoluhq/evolu/blob/f0109fb501a593010e858e39248dde1200eeb2d7/packages/react/src/local-first/useIsSsr.ts#L11)

Avoiding hydration mismatches.

## See

https://kurtextrem.de/posts/react-uses-hydration