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JavaScript Tutorial: Learn JavaScript from Scratch

Overview

An Introduction to JavaScript: Here Is All You Need to Know

Lesson - 1

JavaScript Hello World: Here's What You Need To Know

Lesson - 2

All You Need to Know About JavaScript Arrays

Lesson - 3

Using Array Filter In JavaScript to Filter Array Elements

Lesson - 4

Everything You Need to Know About Array Reduce JavaScript

Lesson - 5

Introduction To JavaScript Loops: Do-While, For, For-In Loops

Lesson - 6

All You Need to Learn About Javascript Functions

Lesson - 7

The Best Guide on How to Implement JavaScript Closures

Lesson - 8

JavaScript “This” Keyword and How to Implement It

Lesson - 9

How to Implement JavaScript Form Validation

Lesson - 10

An Introduction Guide To JavaScript RegEx

Lesson - 11

How to Do an Email Validation in JavaScript?

Lesson - 12

All You Need to Know About JavaScript Promises

Lesson - 13

How to Implement JavaScript Async/Await

Lesson - 14

JavaScript DOM Tutorial: 2020 Edition

Lesson - 15

JavaScript Objects: Properties, Methods, and Accessors

Lesson - 16

Typeof in JavaScript: Checking Data Types Using the Typeof Operator

Lesson - 17

Callback Functions in JavaScript: Everything You Need to Know

Lesson - 18

An Introduction to Javascript Games: The Best Guide

Lesson - 19

An Easy Guide to Build a Calculator App in JavaScript

Lesson - 20

Javascript Projects: The Best Guide

Lesson - 21

Best JavaScript Examples You Must Try in 2024

Lesson - 22

What is OOP in JavaScript? How is it Implemented?

Lesson - 23

JavaScript Events

Lesson - 24

Everything You Need to Know About Let in Javascript

Lesson - 25

Trying Your Hands on Java? Here’s a Guide to Help You Add a New Line in JavaScript

Lesson - 26

Understanding Operators in JavaScript

Lesson - 27

Redirect in Javascript: A Complete Guide to Help You With the Concept

Lesson - 28

Top 80+ JavaScript Interview Questions and Answers for 2025

Lesson - 29

Tips and Tricks That You Should Know Before Going to a Coding Interview

Lesson - 30

Top 65+ JQuery Interview Questions And Answers for 2025

Lesson - 31

Your Complete Guide on the Scope of Variables in JavaScript

Lesson - 32

An Introduction to JavaScript Void 0

Lesson - 33

Understanding Why Is the Password Validation Process Important in JavaScript

Lesson - 34

Java Vs .NET: Which Is the Best Technology to Choose?

Lesson - 35

A Guide to Convert String to Int in Javascript

Lesson - 36

Understanding Why is the Password Validation Process Important in JavaScript

Lesson 34 of 36By Ravikiran A S

Last updated on Nov 26, 20244730
Understanding Why Is the Password Validation Process Important in JavaScript

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We'll talk about Password validation in JavaScript in this blog. Each time a user creates an account on any website or app, we must authenticate a password. We must thus verify a valid password and confirm the validation of the password. The parameters below must be valid in order to have a valid password.

  • An alphanumeric password must be used.
  • The first letter always needs to be capital.
  • A special character must be included in the password (@, $, !, &, etc).
  • The length of the password must exceed 8 characters.

One of the most crucial things about not emptying the password boxes makes it more secure. Whenever a user creates a password, one extra confirm password field always exists. This makes the password confirmed by the system. Password validation in JavaScript leads to protection of your programs in the best manner. Your app can enjoy a sense of security in the right form if it is validated by a proper password. 

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Example for Password Validation in JavaScript

<html>  

<head>  

<title> Verification of valid Password </title>  

</head>  

<script>  

function verifyPassword() {  

  var pw = document.getElementById("pswd").value;  

  //check empty password field  

  if(pw == "") {  

     document.getElementById("message").innerHTML = "**Fill the password please!";  

     return false;  

  }  

 //minimum password length validation  

  if(pw.length < 8) {  

     document.getElementById("message").innerHTML = "**Password length must be atleast 8 characters";  

     return false;  

  }    

//maximum length of password validation  

  if(pw.length > 15) {  

     document.getElementById("message").innerHTML = "**Password length must not exceed 15 characters";  

     return false;  

  } else {  

     alert("Password is correct");  

  }  

}  

</script>   

<body>  

<center>  

<h3> Verify valid password Example </h3>  

<form onsubmit ="return verifyPassword()">  

<!-- Enter Password -->  

<td> Enter Password </td>  

<input type = "password" id = "pswd" value = "">   

<span id = "message" style="color:red"> </span> <br><br>    

<!-- Click to verify valid password -->  

<input type = "submit" value = "Submit">    

<!-- Click to reset fields -->  

<button type = "reset" value = "Reset" >Reset</button>  

</form>  

</center>  

</body>  

</html>  

Output

PasswordValidation.

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What Is the Need for Password Validation in JavaScript?

When a user creates a password, Password validation in JavaScript guarantees that these parameters are obeyed. For the creation of a fairly strong password, the following factors must be followed. Regular expressions in JavaScript code can be used to validate the password structure. The procedures below will be performed to conduct the password validation using JavaScript in the password field.

Regular expressions are patterns that are used to match the original literals given into the field. When it comes to password validation, employing JavaScript's regular expression is critical for detecting the string and determining whether it is in the correct format. JavaScript objects are regular expressions. For password validation, regular expressions are written between slashes in JavaScript code.

Creating a Complete Form and Implementing Password Validation

<!DOCTYPE html>

<html lang=“en”>

<head>

    <meta charset=“UTF-8”>

    <meta name=“viewport” content=“width=device-width, initial-scale=1.0”>

    <title>Form</title>

</head>

<body>

    <div class=“container”>

        <form action=“/action_page.php”>

          <label for=“username”>Email Address</label>

          <input type=“text” id=“username” name=“username” required>      

          <label for=“psw”>Password</label>

        <input type=“password” id=“psw” name=“psw” pattern=“(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,}” title=“Must contain at least one number and one uppercase and lowercase letter, and at least 8 or more characters” required>

          <input type=“submit” value=“Submit”>

        </form>

      </div>

      <div id=“message”>

        <h3>Password must contain the following:</h3>

        <p id=“letter” class=“invalid”>A <b>lowercase</b> </b> letter</p>

        <p id=“capital” class=“invalid”>A <b>capital (uppercase)</b> </b> letter</p>

        <p id=“number” class=“invalid”>A <b>number</b></p>

        <p id=“length” class=“invalid”>Minimum <b>16 characters</b></p>

      </div>

</body>

</html>

CSS

input {

    width: 100%;

    padding: 12px;

    border: 1px solid #ccc;

    border-radius: 4px;

    box-sizing: border-box;

    margin-top: 6px;

    margin-bottom: 16px;

  }

  /* Style the submit button */

  input[type=submit] {

    background-color: #4CAF50;

    color: white;

  }

  /* Style the container for inputs */

  .container {

    background-color: #f1f1f1;

    padding: 20px;

  }

  #message {

    display:none;

    background: #f1f1f1;

    color: #000;

    position: relative;

    padding: 20px;

    margin-top: 10px;

  }

  #message p {

    padding: 10px 35px;

    font-size: 18px;

  }

  .valid {

    color: rgb(3, 184, 190);

  }

  .valid:before {

    position: relative;

    left: -35px;

    content: “&#10004;”;

  }

  .invalid {

    color: red;

  }

  .invalid:before {

    position: relative;

    left: -35px;

    content: “&#10006;”;

  }

Javascript

var myInput = document.getElementById(“psw”);

var letter = document.getElementById(“letter”);

var capital = document.getElementById(“capital”);

var number = document.getElementById(“number”);

var length = document.getElementById(“length”)

myInput.onfocus = function() {

  document.getElementById(“message”).style.display = “block”;

}

myInput.onblur = function() {

  document.getElementById(“message”).style.display = “none”;

}

myInput.onkeyup = function() {

    var lowerCaseLetters = /[a-z]/g;

  if(myInput.value.match(lowerCaseLetters)) {

    letter.classList.remove(“invalid”);

    letter.classList.add(“valid”);

  } else {

    letter.classList.remove(“valid”);

    letter.classList.add(“invalid”);

}

var upperCaseLetters = /[A-Z]/g;

  if(myInput.value.match(upperCaseLetters)) {

    capital.classList.remove(“invalid”);

    capital.classList.add(“valid”);

  } else {

    capital.classList.remove(“valid”);

    capital.classList.add(“invalid”);

  }

  var numbers = /[0-9]/g;

  if(myInput.value.match(numbers)) {

    number.classList.remove(“invalid”);

    number.classList.add(“valid”);

  } else {

    number.classList.remove(“valid”);

    number.classList.add(“invalid”);

  }

  if(myInput.value.length >= 8) {

    length.classList.remove(“invalid”);

    length.classList.add(“valid”);

  } else {

    length.classList.remove(“valid”);

    length.classList.add(“invalid”);

  }

}

Output

The id of an element is first obtained by the JavaScript code, which then allows it to be displayed on the screen. It also applies conditions in order to obtain the password in the desired format. The numerals, uppercase alphabets, and lowercase alphabets are all confirmed using a regular expression written in code.

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Conclusion 

Password validation in JavaScript is essential since it allows the user to create a secure password and prevents password cracking. Using JavaScript, you may add interactivity to the password and thereby notify the user until it contains all of the required characters in any order. The sequences are defined in part by a regular expression written in JavaScript. It reduces the number of written parameters to JavaScript code.

If you want to learn more about full-stack programming for Password validation in JavaScript, look into Simplilearn’s PGP in Full-Stack Software Development program, which is tailored for working professionals and includes 500+ hours of intensive training, 9+ projects, and assignments. The skill up courses for Password validation in JavaScript can also help you polish your skills and enjoy proper working on different complex programs with generation of good results. 

About the Author

Ravikiran A SRavikiran A S

Ravikiran A S works with Simplilearn as a Research Analyst. He an enthusiastic geek always in the hunt to learn the latest technologies. He is proficient with Java Programming Language, Big Data, and powerful Big Data Frameworks like Apache Hadoop and Apache Spark.

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