React-Query’s useQuery hook provides several powerful options that can help you build flexible and efficient data-fetching solutions in your React applications. Whether you need to poll an API at a regular interval, fetch data in the background, or transform the data before it’s returned to the component, options like refetchInterval , If set, this value will be used as the placeholder data for this particular query observer while the query is still in the loading data and no initialData has been provided. placeholderData is not persisted to the cache, Using an empty value attribute on the "placeholder" option allows validation (via the required attribute) to work around having the "placeholder", so if the option isn't changed, but is required, the browser should prompt the user to choose an option from the list., We make use of Placeholder in forms, to show data related to the entity. For example let's say we have an EditUser page and form. We are using Placeholder as an example while viewing this page,, Does this replace [Redux, MobX, etc]? Migrating to React Query 3. Examples, There are a few ways to supply placeholder data for a query to the cache before you need it: Declaratively: Provide placeholderData to a query to prepopulate its cache if empty; Imperatively: Prefetch or fetch the data using queryClient and the placeholderData option; Placeholder Data as a Value.