Nuxt/docs/3.api/2.composables/use-hydration.md

title	description	links
useHydration	Allows full control of the hydration cycle to set and receive data from the server.	label icon to size Source i-simple-icons-github https://github.com/nuxt/nuxt/blob/main/packages/nuxt/src/app/composables/hydrate.ts xs

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.

::callout This is an advanced composable and is mostly used internally (useAsyncData) or by Nuxt modules. ::

Type

useHydration <T> (key: string, get: () => T, set: (value: T) => void) => {}

You can use useHydration() within composables, plugins and components.

useHydration accepts three parameters:

• key: unique key that identifies the data in your Nuxt application
  • Type: String
• get: function that returns the value to set the initial data
  • Type: Function
• set: function that receives the data on the client-side
  • Type: Function

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.

:read-more{to="/docs/getting-started/data-fetching"}