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How to Parse Excel (XLS) Files into JSON Format Using JavaScript/HTML5?

Barbara Streisand

Oct 28, 2024 pm 09:07 PM

How to Parse Excel (XLS) Files into JSON Format Using JavaScript/HTML5?

Parsing Excel (XLS) Files in JavaScript/HTML5

Problem:

When reading an Excel (XLS) file using FileReader, the output often contains undesirable text and characters. The goal is to parse the file row-wise, extracting data from each column and converting it to JSON format.

Solution:

To parse an XLS file row by row and convert it to JSON, follow these steps:

Import necessary JavaScript libraries:

<code class="html"><script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.8.0/jszip.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.8.0/xlsx.js"></script></code>

Create a function for Excel-to-JSON conversion:

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

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

    reader.onload = function(e) {
      var data = e.target.result;
      var workbook = XLSX.read(data, {
        type: 'binary'
      });

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

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

        // Output JSON object
        console.log(json_object);
      })

    };

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

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

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