Question 1

How do I set up dash-uploader to handle large CSV file uploads?

Accepted Answer

Install via pip, use du.configure_upload to specify a server folder, and add the Upload component with filetypes=['csv'] in your layout. The README's example shows how to integrate callbacks for post-upload processing.

Question 2

dash-uploader vs dcc.Upload: which is better for my Dash app?

Accepted Answer

Choose dash-uploader for large files, server-side processing, and built-in progress bars. For small files and simpler setups, dcc.Upload is sufficient and is natively supported by Dash without extra configuration.

Question 3

Is dash-uploader still maintained or safe to use?

Accepted Answer

No, it was archived in July 2025, so it's not actively maintained. For new projects, consider alternatives or be prepared to handle potential issues without updates, as noted in the README warning.

Question 4

How can I secure dash-uploader for a public website?

Accepted Answer

Use the http_request_handler argument in du.configure_upload to implement authentication and token validation, as mentioned in the security note. This adds a layer of protection but requires manual coding.

Question 5

Can I customize the look of the dash-uploader progress bar?

Accepted Answer

The component uses bundled Bootstrap 4 CSS, so customization is limited to CSS overrides. For major changes, you might need to modify the source code, which is risky given the archived status.

Question 6

What happens if a file upload fails in dash-uploader?

Accepted Answer

It uses flow.js for resumable uploads, but error handling isn't detailed in the README. You may need to implement custom callbacks or monitoring to manage interruptions, adding complexity.

dash-uploader

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