Modern web applications often rely on APIs to interact with backend services. Whether you’re building a to-do app, an e-commerce platform, or a blog, chances are you need to send data to the server, not just fetch it. That’s where mutations come into play.
Redux Toolkit introduced RTK Query as a powerful solution for data fetching and caching. Beyond just GET requests, RTK Query handles POST, PUT, PATCH, and DELETE operations with minimal boilerplate. In this blog post, we’ll break down RTK Query mutations with practical examples and show you how to manage state, handle errors, and keep your UI in sync — all cleanly and efficiently.
In RTK Query, a mutation is any API operation that alters server-side data. Think of actions like:
▪️Submitting a form (e.g. creating a user)
▪️Updating profile information
▪️Deleting a post
RTK Query gives you a builder.mutation() method to define such endpoints, just like you define queries with the builder.query().
The best part? RTK Query auto-generates React hooks like useCreatePostMutation for you to use directly in components. These hooks give you loading, success, and error states out of the box.
Before we dive into mutations, let’s set up RTK Query in a simple React project.
Create a central place to define your API endpoints.
Let’s say you want to create a blog post with a POST request.
Add a createPost mutation to your API slice:
RTK Query will automatically generate a hook:
Here’s a form that lets users submit a new blog post. We’ll use the mutation hook inside it:
What’s Going On?
▪️createPost is the mutation trigger function.
▪️isLoading, isSuccess, and error help manage UI feedback.
▪️.unwrap() returns the fulfilled value or throws an error — handy for try/catch logic.
Let’s say your app displays a list of posts using the getPosts query. After creating a post, you’d want that list to automatically refresh. RTK Query makes this easy with invalidatesTags.
Now, RTK Query will re-fetch getPosts automatically every time createPost succeeds. No manual reload needed!
You can define other mutations in the same way:
Use them with hooks like useUpdatePostMutation or useDeletePostMutation.
▪️Automatic loading, success, and error states
▪️Cleaner API call syntax
▪️Built-in cache invalidation and refetching
▪️Less boilerplate compared to Redux Thunks or Sagas
▪️Auto-generated React hooks
RTK Query mutations provide a clean and declarative approach to managing data changes in your application. With just a few lines of code, you get powerful features like automated request state management, caching, and refetching — all without the verbosity of traditional Redux patterns.
Whether you’re building forms, updating user data, or deleting items from a list, RTK Query makes it feel effortless.
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