rsnext/errors/react-client-hook-in-server-component.md

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# React client hook in Server Component
#### Why This Error Occurred
You are using a React client hook in a Server Component.
#### Possible Ways to Fix It
Mark the component using the hook as a Client Component by adding `'use client'` at the top of the file.
##### Before
```jsx
import { useEffect } from 'react'
export default function Page() {
useEffect(() => {
console.log('in useEffect')
})
return <p>Hello world</p>
}
```
##### After
```jsx
'use client'
import { useEffect } from 'react'
export default function Page() {
useEffect(() => {
console.log('in useEffect')
})
return <p>Hello world</p>
}
```
### Useful Links
[Server and Client Components](https://beta.nextjs.org/docs/rendering/server-and-client-components)