Question 1

How do I parse an Excel file in Node.js with SheetJS?

Accepted Answer

Install the SheetJS Node module from npm or cdn.sheetjs.com, then use the readFile method to extract data into a workbook object. Refer to the official docs for code examples.

Question 2

SheetJS vs ExcelJS: which is better?

Accepted Answer

SheetJS excels in broad format support and battle-tested reliability, while ExcelJS offers more built-in styling features. Choose SheetJS for compatibility or ExcelJS for richer Excel-specific manipulations.

Question 3

Does SheetJS free version handle Excel formulas?

Accepted Answer

No, formula evaluation is not included in the Community Edition; it's a feature of SheetJS Pro, requiring a paid license.

Question 4

How to convert JSON to XLSX using SheetJS?

Accepted Answer

Use the utils.json_to_sheet function to create a worksheet from JSON, then build a workbook and write it to a file. The documentation provides step-by-step guides.

Question 5

Is SheetJS good for large CSV files?

Accepted Answer

Yes, but for very large files, consider memory usage; SheetJS can parse CSVs efficiently, but streaming or chunking might need custom implementation without Pro features.

Question 6

Can I use SheetJS in a React app?

Accepted Answer

Absolutely—SheetJS works in browsers via script tags or modules, making it suitable for React apps to import/export spreadsheet data without server-side processing.

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