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Discover how to fix the frustrating `404 error` when deploying your Next.js application to AWS Amplify. Follow these easy steps for a successful deployment.
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Resolving 404 errors When Deploying a Next.js App to AWS Amplify

Deploying web applications can be a complex process, and running into a 404 error is one of the most common setbacks developers face. If you've found yourself in this situation while attempting to deploy a Next.js v12 application to AWS Amplify, you're not alone. In this guide, we'll help you diagnose and fix the issue so that you can get your application up and running smoothly.

Understanding the Problem

When deploying your Next.js app to AWS Amplify, it’s common to see that the deployment checks pass successfully, but visiting the provided URL leads to a 404 Not Found error. This can be frustrating, especially when all the build settings appear correct, and your application seems ready to go.

Typical Setup

To give some context, here’s a quick look at a sample configuration that might lead to the 404 error:

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In this case, the command npm run buildamp is just an alias for next build, and the application builds into the .next directory. However, issues often arise from settings in configuration files or the way Amplify is configured to handle the app.

Steps to Fix the Issue

If you're dealing with a 404 error after following the standard deployment procedures, there are key configurations you may have overlooked. Here’s how to adjust your AWS Amplify settings for a successful deployment.

1. Set the App Platform to WEB_COMPUTE

One crucial step in resolving the 404 error is ensuring that your app's platform is set correctly. For Next.js applications, you need to adjust the platform setting. You can do this easily using the AWS CLI.

Run the following command to update your app's platform:

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2. Specify the Branch Framework as Next.js - SSR

Next, ensure that your branch is set to the proper framework. For Next.js applications, it's essential to specify that it's using server-side rendering (SSR). Again, you can use the AWS CLI for this configuration.

Use the following command to update the framework for your branch:

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3. Additional Considerations

Configuration Files: Make sure your tsconfig.json, jsconfig.json, and next.config.js files have the right settings to support the structure of your app. Pay attention to any deprecated configurations that may not align with the latest Next.js standards.

Folder Structure: Verify that the .next directory is indeed where your artifacts are being generated. Any discrepancies in folder names might lead to AWS Amplify not finding the necessary files.

Conclusion

By following the steps outlined above, you should be well on your way to resolving the 404 error when deploying your Next.js app to AWS Amplify. Remember to set the platform correctly and select the appropriate framework for your branch. With patience and careful configuration, your app will be successfully deployed and live for everyone to access.

If you have any questions or run into further issues, feel free to reach out. Happy coding!