Resolving Cannot find module Error During Node.js Deployment on Koyeb

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Understanding the Error

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What Causes This Error?

File Path Issues: Sometimes, the path to the module may be incorrect, or the module itself may not exist in the specified location.

Case Sensitivity: One of the main culprits for this error is the difference in case sensitivity between operating systems. For instance, Windows is primarily case-insensitive, while many cloud platforms, including Koyeb (based on Linux), are case-sensitive.

Diagnosing the Issue

In the original scenario, the developer was unsure why the Cannot find module error occurred when deploying the app, despite having a properly functioning application on their local machine. It was later identified that the error stemmed from the case sensitivity of the filesystem. Here's how to approach diagnosing this issue:

Steps to Diagnose

Check File Names: Ensure that the casing of file names in your require statements matches exactly with the actual files.

Test on a Linux Environment: If possible, you can create a simple virtual machine or container running Linux to test your application as it would run in the Koyeb environment.

Review Logs: Check your deployment logs for additional context around the error.

Fixing the Issue

Now that we understand the possible reasons behind the Cannot find module error, let's focus on resolving it.

Steps to Fix

Check and Correct Case Sensitivity:

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

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

Conclusion

Remember, if problems persist, consulting Koyeb’s documentation or seeking help from the community can provide additional insights. Happy coding!