docs.sheetjs.com/docz/docs/04-getting-started/03-demos/06-clipboard.md

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Clipboard Data

Spreadsheet software like Excel typically support copying and pasting cells and data. This is implemented through the Clipboard ("Pasteboard" in OSX parlance).

When copying a selection of cells, Excel for Windows stores a screenshot of the selected cells as an image. It also creates and stores a number of strings and files for the various formats, including TSV, CSV, HTML, RTF, SYLK, DIF, XLSB, XLS (both '97-2004 and '95), and SpreadsheetML 2003.

Not all Clipboard APIs offer access to all clipboard types.

Browser

Clipboard data can be read from a paste event, accessible from the event clipboardData property:

document.onpaste = function(e) {
  /* get TSV */
  var str = e.clipboardData.getData('text/html');
  /* parse */
  var wb = XLSX.read(str, {type: "string"});
  /* DO SOMETHING WITH wb HERE */
}

getData accepts one argument: the desired MIME type. Chrome 103 supports:

MIME type	Data format
text/plain	TSV (tab separated values)
text/html	HTML
text/rtf	RTF (rich text format)

getData returns a string compatible with the string type for XLSX.read.

Live Demo

Open a file in Excel, copy some cells, then come back to this window. Click on "RESULT" below and paste (Control+V for Windows, Command+V for Mac).

function Clipboard() {
  const [csvs, setCSVs] = React.useState([ "", "", "" ]);

  /* Set up paste handler */
  React.useEffect(async() => {
    document.onpaste = function(e) {
      /* this demo will read 3 different clipboard data types */
      var mime_arr = [ 'text/plain', 'text/html', 'text/rtf' ];
      /* get clipboard data for each type */
      var data_arr = mime_arr.map(mime => e.clipboardData.getData(mime));
      /* parse each data string into a workbook */
      var wb_arr = data_arr.map(str => XLSX.read(str, {type: "string"}));
      /* get first worksheet from each workbook */
      var ws_arr = wb_arr.map(wb => wb.Sheets[wb.SheetNames[0]]);
      /* generate CSV for each "first worksheet" */
      var result = ws_arr.map(ws => XLSX.utils.sheet_to_csv(ws));
      setCSVs(result);
    }
  }, []);

  return (
    <>
      {csvs[0] && (<pre><b>Data from clipboard TSV  (text/plain)</b><br/>{csvs[0]}</pre>)}
      {csvs[1] && (<pre><b>Data from clipboard HTML (text/html)</b><br/>{csvs[1]}</pre>)}
      {csvs[2] && (<pre><b>Data from clipboard RTF  (text/rtf)</b><br/>{csvs[2]}</pre>)}
      {csvs.every(x => !x) && <b>Copy data in Excel, click here, and paste (Control+V)</b>}
    </>
  )
}