xlsx is a JavaScript library for parsing and writing Excel (XLSB/XLSX/XLSM/XLS/XML) and ODS spreadsheet files. It enables easy manipulation of spreadsheet data within web browsers or Node.js environments, allowing users to read, modify, and create spreadsheet data efficiently.
📄 HTML
<div id='example'>
<input type='file' id='input-excel' />
<button onclick='readFile()'>Read File</button>
<pre id='output'></pre>
</div>
🧩 External JS
<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.17.0/xlsx.full.min.js"></script>
⚙️ JavaScript
function readFile() {
var file = document.getElementById('input-excel').files[0];
var reader = new FileReader();
reader.onload = function(e) {
var data = new Uint8Array(e.target.result);
var workbook = XLSX.read(data, {type: 'array'});
var first_sheet_name = workbook.SheetNames[0];
var worksheet = workbook.Sheets[first_sheet_name];
var output = XLSX.utils.sheet_to_json(worksheet, {header:1});
document.getElementById('output').innerText = JSON.stringify(output, null, 2);
};
reader.readAsArrayBuffer(file);
}
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