Nuxt/docs/content/1.docs/3.api/1.composables/use-hydration.md

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# `useHydration`
Allows full control of the hydration cycle to set and receive data from the server.
`useHydration` is a built-in composable that provides a way to set data on the server side every time a new HTTP request is made and receive that data on the client side. This way `useHydration` allows you to take full control of the hydration cycle.
## Type
```ts [signature]
useHydration <T> (key: string, get: () => T, set: (value: T) => void) => {}
```
You can use `useHydration()` within composables, plugins and components.
`useHydration` accepts three parameters:
- `key`
**Type**: `String`
`key` is a unique key that identifies the data in your Nuxt application
- `get`
**Type**: `Function`
`get` is a function that returns the value to set the initial data
- `set`
**Type**: `Function`
`set` a function that receives the data on the client-side
Once the initial data is returned using the `get` function on the server side, you can access that data within `nuxtApp.payload` using the unique key that is passed as the first parameter in `useHydration` composable.
::ReadMore{link="/docs/getting-started/data-fetching"}
::