Mastering useMutation in React Query: Error and Success Notifications in Next.js

---

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to use correctly useMutation from react-query, get error and success notifications?

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---

The Problem

In a recent project, a developer faced challenges while implementing useMutation to add a new user to a MongoDB database using a POST request. While the new user was successfully added, they encountered the following issues:

Error Handling Failure: The onError functionality in useMutation didn't trigger when adding a user with an existing name.

Missing Success Response: The postUser function handling the creation was not sending back a result to the frontend, which is essential for user feedback.

Understanding these problems is vital for enhancing user experience through effective feedback mechanisms. Let's dive into the solution!

Solution Overview

Step 1: Modify the addUser Function

The first step in resolving the issue is to modify the addUser function. By removing the try-catch block, we ensure react-query can handle errors returned from the server.

Here’s the modified function:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Update the postUser Handler

To make sure the frontend gets a success notification after a user is created, we need to return a proper response from the postUser API handler. Here’s the updated implementation:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Utilize Mutation Execution in the Form

In your component that handles the form submission, make sure to utilize the mutate function effectively and to listen for both success and error states. Here’s a concise way to handle this:

[[See Video to Reveal this Text or Code Snippet]]

Complete Code Example

Here’s how everything comes together in your form component:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion