How to Resolve the Unexpected end of multipart data Error in Node.js File Uploads

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What Causes the Error?

Environment Issues: Incompatibilities across different platforms (Windows vs. Linux) can lead to this error. It was reported that the error doesn't appear on Linux systems while it shows up on Windows machines.

Incomplete Data: If the data sent in the multipart form is truncated or not complete, the Busboy parser will throw this error.

Incorrect Content-Type: Ensure that the request headers have the correct Content-Type set, typically multipart/form-data for file uploads.

Solution Approach

To resolve the Unexpected end of multipart data error, you can follow these steps. The solution involves ensuring your code is correctly set up for handling file uploads, especially on differing operating systems like Windows and Linux.

Step 1: Check Your File Upload Code

Here’s a revised approach to your file upload handling using the Busboy library. Make sure your code adheres to best practices:

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

Step 2: Cross-Platform Testing

Given that the error did not manifest on a Linux machine, you should:

Test your application on a Linux environment to confirm that the error is indeed related to your local Windows configuration.

If you're developing on Windows, consider using Windows Subsystem for Linux (WSL) for a more compatible environment.

Step 3: Serve the Files Correctly

If the error disappears but you are unable to view the uploaded images, ensure that:

The files are being properly saved to your desired location (e.g., S3 in your case).

You have the correct permissions set to view the uploaded files.

The file is correctly referenced on your frontend.

Conclusion