Resolving Proxy Not Allowing Communication Between React.js and Node.js Applications

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Understanding the Problem

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The Initial Setup

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You likely also reset the server and cleared the cache, but if that didn't work, it's essential to check how the routes are defined.

How to Fix the Proxy Configuration

Step 1: Adjust the Express Router Setup

The first step to solving the proxy issue is adjusting the way routes are defined within your Express server. Here’s how you may have set it up:

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This configuration implies that any routes defined inside saveDriverInformationController will be relative to /api/saveDriverInformation. Thus, if your controller defines a route like this:

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The endpoint will be /api/saveDriverInformation/api/saveDriverInformation, which is incorrect.

Step 2: Correct the Router and Controller Routes

To resolve this, you need to redefine your routes as follows:

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Then modify your controller routes to remove the /api prefix:

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Step 3: Confirm CORS Configuration

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Step 4: Testing the Configuration

After making these changes:

Clear your browser cache.

Test the API request from your React app again.

You should see a successful data submission with the message:

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Conclusion

If you have any questions or suggestions based on your own experiences with similar issues, feel free to share in the comments!