One of the best tools to read an Excel file is the POI library, which allows you to create a new workbook on the fly. Then, with this library, you can transform an Excel workbook into a table, array, or JSON, all on the client side. For more advanced use cases, you can pass the map option to readXlsxFile(). This method automatically maps data rows to a JSON object, but without parsing or validation. This makes it possible to convert any format in the spreadsheet.
If you’re trying to import an Excel file into your app, you can use the schema conversion function. This function imports an Excel file, and displays errors related to the format. In addition, it does not require any validation or parsing. You can also pass the map option to readXlsxFile(). This function converts data rows into a JSON object, which can then be retrieved and displayed on the page. It also supports HTML5, which makes it very flexible.