PatternsTools & Utilities

XLSX → CSV export

Load Excel .xlsx or .xls workbooks in the browser with SheetJS, pick a sheet, preview rows, and download CSV—with optional UTF-8 BOM and multi-sheet export.

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Problems solved

Technical challenges this implementation handles out of the box.

Convert uploaded Excel sheets to CSV without a server round trip
Preview workbook rows and export one or all sheets
Optionally add a UTF-8 BOM for Excel-friendly CSV

Use cases

Products and workflows this pattern is designed to support.

Spreadsheet interchange tools
Reporting export utilities
Offline Excel to CSV conversion
Data migration prep workflows

Setup

Requirements, wiring steps, and what this pattern adds to your project.

Getting started

Pick how you want to pull this pattern in — then wire env vars and routes the same way.

1
Install from the preview toolbar
Copy the install command above and run it in your project — Pro patterns include a short-lived token.
2
Customize the agent and tool files
Adapt prompts, tools, and stop conditions for your product — Copy for AI in the toolbar helps seed that work.
3
Run your dev server and open the pattern route
Install dependencies if needed, then start the app and verify responses.

Files added

3 files

app/page.tsx
app/layout.tsx
README.md

Dependencies

14 total

npm packages

@hugeicons-pro/core-stroke-rounded@hugeicons/reactfile-saverNext.jsReactsonnerxlsx

Registry components

buttoncardcheckboxemptylabelselecttable

Critical files

lib/xlsx-csv.ts
SheetJS read from ArrayBuffer; sheet_to_csv for downloads; sheet_to_json header:1 for preview rows; sanitize filenames; UTF-8 BOM option; file-saver downloads.