How do you parse XLS files and convert their data to JSON format using JavaScript?

Parsing Excel Files in JavaScript/HTML5

When working with Excel files in a web application, it's essential to understand how to parse the data in a meaningful way. This article explores how to read XLS files in JavaScript and convert their row-based data into JSON format.

Reading XLS Files Row-Wise

To read an XLS file row by row, you can use the FileReader interface provided by HTML5. FileReader allows you to access the contents of a local file, allowing you to read and parse it.

Convert XLS to JSON

Once you have the file data, you need to convert it into JSON format. This can be achieved using the XLSX library, which provides a method called XLSX.utils.sheet_to_row_object_array() to convert an Excel sheet to an array of row objects. These row objects can then be easily converted to JSON using JSON.stringify().

Example Code

Here's an example code snippet that demonstrates how to parse an XLS file and convert it to JSON using the FileReader and XLSX libraries:

<code class="javascript">var ExcelToJSON = function() {

  this.parseExcel = function(file) {
    // Instantiate FileReader.
    var reader = new FileReader();

    reader.onload = function(e) {
      // Retrieve the Excel file data.
      var data = e.target.result;

      // Create a workbook object from the data.
      var workbook = XLSX.read(data, { type: 'binary' });

      workbook.SheetNames.forEach(function(sheetName) {
        // Convert a sheet to an array of row objects.
        var XL_row_object = XLSX.utils.sheet_to_row_object_array(workbook.Sheets[sheetName]);

        // Convert the row objects to JSON.
        var json_object = JSON.stringify(XL_row_object);

        // Log the JSON object to the console.
        console.log(json_object);
      });
    };

    reader.onerror = function(ex) {
      console.log(ex);
    };

    reader.readAsBinaryString(file);
  };
};</code>

Additional Resources

For more information on parsing XLS in JavaScript, you can refer to the following resources:

• [XLSX library documentation](https://github.com/SheetJS/js-xlsx)

If you encounter any issues or have additional questions, feel free to post a comment on this page.

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