How to parse Excel (XLS) file in Javascript/HTML5

Question

Below Function converts the Excel sheet (XLSX format) data to JSON. you can add promise to the function.

<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>
<script>
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) {
        // Here is your object
        var XL_row_object = XLSX.utils.sheet_to_row_object_array(workbook.Sheets[sheetName]);
        var json_object = JSON.stringify(XL_row_object);
        console.log(json_object);

      })

    };

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

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

Below post has the code for XLS format Excel to JSON javascript code?

Old question, but I should note that the general task of parsing XLS files from javascript is tedious and difficult but not impossible.

I have basic parsers implemented in pure JS:

• http://oss.sheetjs.com/js-xls/ (XLS files, what you wanted)
• http://oss.sheetjs.com/js-xlsx/ (XLSX/XLSM/XLSB files)

Both pages are HTML5 File API-driven XLS/XLSX parsers (you can drag-drop your file and it will print out the data in the cells in a comma-separated list). You can also generate JSON objects (assuming the first row is a header row).

The test suite http://oss.sheetjs.com/ shows a version that uses XHR to get and parse files.

Upload an excel file here and you can get the data in JSON format in console:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<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>
<script>
    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) {
            // Here is your object
            var XL_row_object = XLSX.utils.sheet_to_row_object_array(workbook.Sheets[sheetName]);
            var json_object = JSON.stringify(XL_row_object);
            console.log(JSON.parse(json_object));
            jQuery( '#xlx_json' ).val( json_object );
          })
        };

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

        reader.readAsBinaryString(file);
      };
  };

  function handleFileSelect(evt) {
    
    var files = evt.target.files; // FileList object
    var xl2json = new ExcelToJSON();
    xl2json.parseExcel(files[0]);
  }


 
</script>

<form enctype="multipart/form-data">
    <input id="upload" type=file  name="files[]">
</form>

    <textarea class="form-control" rows=35 cols=120 id="xlx_json"></textarea>

    <script>
        document.getElementById('upload').addEventListener('change', handleFileSelect, false);

    </script>

This is a combination of the following Stackoverflow posts:

1. https://stackoverflow.com/a/37083658/4742733
2. https://stackoverflow.com/a/39515846/4742733

Good Luck...

This code can help you
Most of the time jszip.js is not working so include xlsx.full.min.js in your js code.

Html Code

 <input type="file" id="file" ng-model="csvFile"  
    onchange="angular.element(this).scope().ExcelExport(event)"/>

Javascript

<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.8.0/xlsx.js">
</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.8.0/jszip.js">
</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.10.8/xlsx.full.min.js">
</script>

$scope.ExcelExport= function (event) {


    var input = event.target;
    var reader = new FileReader();
    reader.onload = function(){
        var fileData = reader.result;
        var wb = XLSX.read(fileData, {type : 'binary'});

        wb.SheetNames.forEach(function(sheetName){
        var rowObj =XLSX.utils.sheet_to_row_object_array(wb.Sheets[sheetName]);
        var jsonObj = JSON.stringify(rowObj);
        console.log(jsonObj)
        })
    };
    reader.readAsBinaryString(input.files[0]);
    };

If you want the simplest and tiniest way of reading an *.xlsx file in a browser then this library might do:

https://catamphetamine.github.io/read-excel-file/

<input type="file" id="input" />

import readXlsxFile from 'read-excel-file'

const input = document.getElementById('input')

input.addEventListener('change', () => {
  readXlsxFile(input.files[0]).then((data) => {
    // `data` is an array of rows
    // each row being an array of cells.
  })
})

In the example above data is raw string data. It can be parsed to JSON with a strict schema by passing schema argument. See API docs for an example of that.

API docs: http://npmjs.com/package/read-excel-file