Category: [FRONTEND]
Difficulty: ● MEDIUM
Tags: csv-upload, drag-drop, validation-ui
Implement a drag-and-drop CSV uploader. Parse the file client-side to show a preview table before submission. Highlight rows with errors (invalid addresses, missing fields) and display row-level error messages.
- Drag-and-drop upload zone implemented.
- Client-side CSV parsing and data preview.
- Visual indication of validation errors in the preview table.