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Learn how to upload multiple image files to BackBlaze while ensuring they keep their original order with this step-by-step guide using Node.js, Express, and the backblaze-b2 npm module.
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How to Upload Multiple Files to BackBlaze in the Correct Order Using Node.js

Uploading files to cloud storage solutions like BackBlaze can sometimes come with unexpected issues, especially when you want to retain the order of the uploaded files based on their filenames. If you're working on a Node.js application and facing the challenge of keeping the file IDs in sync with the filenames, you're not alone.

In this guide, we’ll explore a typical problem encountered when uploading images to BackBlaze and provide an effective solution to ensure that the image IDs correlate properly with their original file names.

Understanding the Problem

When uploading multiple images to BackBlaze, you may find that the IDs returned for these images do not match the order of the files as they were uploaded. For example, if you have images named 0001.jpg, 0002.jpg, and so forth, after the upload process, the ID for 0001.jpg might end up in the position of 0005.jpg, causing confusion and potential issues during retrieval.

The Original Code

Consider the following code snippet used for uploading files:

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

In this setup, the imageIds array ends up receiving IDs in an arbitrary order, making it difficult to correctly relate the uploaded images with their corresponding IDs.

The Solution: Ensure Proper Order with Promises

To effectively tackle the order issue, we can make use of the Promise.all functionality. By returning the fileId from each promise directly and waiting for all the promises to resolve, we can keep the IDs in sync with their original files. Here’s an improved approach:

Step-by-Step Implementation

Setup the Environment:
Ensure you have all necessary dependencies installed in your Node.js project:

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

Refine the Upload Function:
Modify your function to return file IDs directly from the upload promises, eliminating the need for a separate array to store the IDs.

Here is a refined version of the code:

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

What Changed

Directly Return File ID: Instead of pushing IDs into an array, return the fileId directly from the mapping function.

Use of Promise.all: This guarantees that the order of the file IDs corresponds precisely with that of the files being processed.

Clean Temporary Directory: Remember to remove the temporary directory after processing to keep your file system clean.

Conclusion

By implementing the adjustments mentioned above, you can ensure that the file IDs returned from your uploads correspond correctly to their original filenames. Integrating Promise.all into your workflow allows you to maintain that much-needed order, streamlining your application's functionality.

Feel free to reach out if you have any questions or need further assistance. Happy coding!