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How To Do Email Validation In JavaScript? [With Examples]

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23rd Feb, 2021
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How To Do Email Validation In JavaScript? [With Examples]

JavaScript is a programming language designed to create applications. It is much faster than other languages because it is so lightweight and easy-to-use. It is used for creating well-designed applications.

Email validation in JavaScript is important for the user experience of creating web applications. Validation helps in passing valid information to a server from the client of the web application.

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What is Validation?

Validation refers to the process of examining the values that the user inputs. It plays a crucial role in creating applications and enhances the user experience. Many fields, such as mobile numbers, emails, dates, and passwords, are validated through this process. 

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JavaScript makes the validation process faster due to its faster processing of data than other server-side validation. Now let’s have a look at the implementation of the email validation in JavaScript.

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Email Validation in JavaScript

Email validation is one of the vital parts of authenticating an HTML form. Email is a subset or a string of ASCII characters, divided into two parts using @ symbol. Its first part consists of private information, and the second one contains the domain name in which an email gets registered.

Here are the ASCII characters of the first part:

  • Special characters such as # * + & ’ ! % @ ? { ^ } ”
  • Numeric characters (0 to 9)
  • Full stop, dot, etc., having a condition that it can’t be the email’s last or the very first letter and can’t be repeated after another.
  • Uppercase alphabets (A to Z) and Lowercase (a to z) alphabets

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The second part includes the following:

  • Dots
  • Digits
  • Hyphens
  • Letters

Using regular expressions is one of the best ways of email validation in JavaScript. It utilizes regular expressions for defining the character’s pattern.

Some of the examples of valid email id:


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Some Other Examples of Invalid Email Id

  • (one on another dots are not allowed)
  • Inownzsite()& (only characters, dash, underscore, and digits are allowed in the regular expression.)
  • (here @ symbol is not there)
  • (Here top-level domain can’t begin with a dot)
  • (here it can’t start with @ symbol)
  • Younourmetd345@abcd.b (“.b” is not a valid top-level domain)email.js

The file consists of a JavaScript code required for email validation. Here the regular expressions are used to validate an email at the client-side of an application.

Checkpoints for efficient email validation in JavaScript code:

  • Describe a regular expression to validate an email address
  • If an input value matches regular expressions
  • If it matches, sends the alert saying “email address is valid.”
  • If it does not match, send the alert saying, “email address is invalid.”

Related: Password Validation in Javascript

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Email Validation Code in JavaScript

Given below is the email validation code in JavaScript. This code can validate if the email created or entered by the user is valid or not. Save the file as filename.js. 

// Code Snippet

function EmailValidation(enteredEmail)


var mail_format = /^w+([.-]?w+)*@w+([.-]?w+)*(.w{2,3})+$/;



alert(“Yeah! a valid email!”);


return true;




alert(“Sorry! an invalid email!”);


return false;



The JavaScript function is used in the HTML form as below. Save the file as filename.html:

<!DOCTYPE html>

<html lang=”en”>


<meta charset=”utf-8″>

<title>email validation in JavaScript</title>

<link rel=’stylesheet’ href=’form-style.css’ type=’text/css’ />


<body onload=’document.form1.text1.focus()’>

<div class=”mail”>

<h2>Enter the email for Validation</h2>

<form name=”form1″ action=”#”>


<li><input type=’text’ name=’text1’/></li>

<li> </li>

<li class=”Validate”><input type=”submit” name=”Validate” value=”Validate” onclick=”ValidateEmail(document.form1.text1)”/></li>

<li> </li>




<script src=”filename.js”></script>



The following code can add style to the form using CSS. Save the file as filename.css.

li {list-style-type: none;

font-size: 16pt;


.mail {

margin: auto;

padding-top: 20px;

padding-bottom: 20px;

width: 850px;

background : rgb(150, 195, 208);

border: 1px soild rgb(1, 20, 24);


.mail h2 {

margin-left: 36px;


input {

font-size: 28pt;


input:focus, textarea:focus{

background-color: white;


input submit {

font-size: 18pt;


Now you can execute the HTML code and get the email validation in JavaScript done.

Read: Javascript Projects in GitHub

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Email validation is very crucial to avoid making invalid email addresses. In this article, it is explained, with the code, to validate whether an email id is valid or not and let the system check and notify the user if the email id entered is not valid. 

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Rohan Vats

Blog Author
Software Engineering Manager @ upGrad. Passionate about building large scale web apps with delightful experiences. In pursuit of transforming engineers into leaders.

Frequently Asked Questions (FAQs)

1What is regular expression in programming?

Regular expressions are a type of pattern used to find and manipulate text. They are a commonly used tool for extracting data from strings or text. You can think of them being similar to wildcard characters such as star * or question mark ?. They are not just used in programming though. For example, the Linux command line uses regular expressions to search for files. Simply put, regular expression is a set of symbols and characters that can be used to match a certain pattern. It is used to match the pattern against a certain text. Using regular expression is one of the most powerful features in programming.

2What are the applications of regular expressions?

Regular expressions are used in many places, but the most obvious one is text processing. If you have to parse a text file, search a string with hundreds of words in it, or validate an email-addresses, you use regular expressions. Like any specialized language, regular expressions can be a bit arcane, but if you take the time to learn them well, you’ll find them quite useful. The next thing is that you should learn to use a couple of regular expressions library like PCRE or JGsoft.

3What are the applications of Javascript?

Javascript is the most prevalent language for web development and also one of the most popular programming languages. The applications of Javascript range from beginner to expert and covers foundation to advanced concepts which include calendars and date arithmetic, message boxes, image maps, image processing, video and audio players and more. Javascript is a scripting language that is used for adding dynamic and interactive content to Web pages. It's a lightweight programming language that is used by developers to make websites more interactive and appealing.

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