How to Verify Aadhar Card Number without any API


Example

<!DOCTYPE html>
<html>
<head>
	<title>Aadhar Card Verify</title>
	<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
</head>
<body>
	<div class="container">
		<div class="col-md-6" style="margin-top: 50px;">
		  	<div class="form-group">
		    	<label for="exampleInputAadharCard">Aadhar Card No.</label>
		    	<input type="text" class="form-control" id="exampleInputAadharCard" placeholder="Enter Your Aadhar Card No." name="exampleInputAadharCard">
		    	<small id="message" class="form-text text-muted"></small>
		  	</div>
		  	<button type="button" class="btn btn-primary" onclick="verify()">Verify</button>
		</div>
	</div>
	<script type="text/javascript">
	/* multiplication table */
	const d = [
	    [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
	    [1, 2, 3, 4, 0, 6, 7, 8, 9, 5],
	    [2, 3, 4, 0, 1, 7, 8, 9, 5, 6],
	    [3, 4, 0, 1, 2, 8, 9, 5, 6, 7],
	    [4, 0, 1, 2, 3, 9, 5, 6, 7, 8],
	    [5, 9, 8, 7, 6, 0, 4, 3, 2, 1],
	    [6, 5, 9, 8, 7, 1, 0, 4, 3, 2],
	    [7, 6, 5, 9, 8, 2, 1, 0, 4, 3],
	    [8, 7, 6, 5, 9, 3, 2, 1, 0, 4],
	    [9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
	]

	/* permutation table */
	const p = [
	    [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
	    [1, 5, 7, 6, 2, 8, 3, 0, 9, 4],
	    [5, 8, 0, 3, 7, 9, 6, 1, 4, 2],
	    [8, 9, 1, 6, 0, 4, 3, 5, 2, 7],
	    [9, 4, 5, 3, 1, 2, 6, 8, 7, 0],
	    [4, 2, 8, 6, 5, 7, 3, 9, 0, 1],
	    [2, 7, 9, 3, 8, 0, 6, 4, 1, 5],
	    [7, 0, 4, 6, 9, 1, 3, 2, 5, 8]
	]

	/* validates Aadhar number received as string */
	function validate(aadharNumber) {
	    let c = 0
	    let invertedArray = aadharNumber.split('').map(Number).reverse()

	    invertedArray.forEach((val, i) => {
	        c = d[c][p[(i % 8)][val]]
	    })

	    return (c === 0)
	}

	function verify() {
		var message = document.getElementById("message");
		var aadharNo = document.getElementById("exampleInputAadharCard").value;
		if(validate(aadharNo)) {
			message.innerHTML = 'Your aadhar card no. valid';
		} else {
			message.innerHTML = 'Your aadhar card no. not valid';
		}
	}
	</script>
</body>
</html>