JavaScript Project – Password Strength Checker
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Program 1
<!-- Project: Password Strength Checker -->
<!--
1. The password must be at least 8 characters long.
2. The password must contain at least one uppercase letter.
3. The password must contain at least one lowercase letter.
4. The password must contain at least one digit.
5.The password must contain at least one special character (e.g., !, @, #, $, etc.). -->
<html>
<head><title>Password Strength Checker</title>
<script type="text/javascript">
function check_password()
{
let password=document.getElementById("txtpassword").value
// Regular Expressions to check the criteria
const minLength = /.{8,}/; // Minimum length 8 characters
const hasUpperCase = /[A-Z]/; // At least one uppercase letter
const hasLowerCase = /[a-z]/; // At least one lowercase letter
const hasDigits = /\d/; // At least one number
const hasSpecialChar = /[!@#$%^&*(),.?":{}|<>]/; // At least one special character
if(!minLength.test(password))
alert("Password must have minimum length 8 characters....!")
else if(!hasUpperCase.test(password))
alert("Password must have at least one uppercase letter....!")
else if(!hasLowerCase.test(password))
alert("Password must have at least one lowercase letter....!")
else if(!hasDigits.test(password))
alert("Password must have at least one number(digit)....!")
else if(!hasSpecialChar.test(password))
alert("Password must have at least one special character....!")
else
document.writeln("<br><br><br><center><font color=#c04409 size=6>Great your Password is Strong password.....!: "+password+" </font></center>")
}
</script>
</head>
<body>
<center>
<br><br><br>
<font color="#c04409" size="6">Password Strength Checker</font>
<form>
<table border="1">
<tr>
<th><font color="#f49b0d" size="5">Enter Your Password:</font></th>
<td>
<input type="password" id="txtpassword">
<input type="button" value="Check Password" onclick="check_password()">
</td>
</tr>
</table>
</form>
</center>
</body>
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