react-query/docs/framework/react/guides/does-this-replace-client-state.md

---
id: does-this-replace-client-state
title: Does TanStack Query replace Redux, MobX or other global state managers?
---

Well, let's start with a few important items:

- TanStack Query is a **server-state** library, responsible for managing asynchronous operations between your server and client
- Redux, MobX, Zustand, etc. are **client-state** libraries that _can be used to store asynchronous data, albeit inefficiently when compared to a tool like TanStack Query_

With those points in mind, the short answer is that TanStack Query **replaces the boilerplate code and related wiring used to manage cache data in your client-state and replaces it with just a few lines of code.**

For a vast majority of applications, the truly **globally accessible client state** that is left over after migrating all of your async code to TanStack Query is usually very tiny.

> There are still some circumstances where an application might indeed have a massive amount of synchronous client-only state (like a visual designer or music production application), in which case, you will probably still want a client state manager. In this situation it's important to note that **TanStack Query is not a replacement for local/client state management**. However, you can use TanStack Query alongside most client state managers with zero issues.

## A Contrived Example

Here we have some "global" state being managed by a global state library:

```tsx
const globalState = {
  projects,
  teams,
  tasks,
  users,
  themeMode,
  sidebarStatus,
}
```

Currently, the global state manager is caching 4 types of server-state: `projects`, `teams`, `tasks`, and `users`. If we were to move these server-state assets to TanStack Query, our remaining global state would look more like this:

```tsx
const globalState = {
  themeMode,
  sidebarStatus,
}
```

This also means that with a few hook calls to `useQuery` and `useMutation`, we also get to remove any boilerplate code that was used to manage our server state e.g.

- Connectors
- Action Creators
- Middlewares
- Reducers
- Loading/Error/Result states
- Contexts

With all of those things removed, you may ask yourself, **"Is it worth it to keep using our client state manager for this tiny global state?"**

**And that's up to you!**

But TanStack Query's role is clear. It removes asynchronous wiring and boilerplate from your application and replaces it with just a few lines of code.

What are you waiting for, give it a go already!