How To Validate An Email Address In Javascript

by

Email validation is a common task when building web applications. Whether you’re working with user registration forms or sending out newsletters, it’s essential to verify that the email addresses you collect are valid. In this post, we’ll teach you how to validate an email address using JavaScript.

Method 1: Using Regular Expressions

The most common way to validate an email address in JavaScript is by using regular expressions. A regular expression is a sequence of characters that forms a search pattern; it can be used to check whether a string matches the specified pattern.

To validate an email address using a regular expression, you can use the following function:

function isValidEmailAddress(email) {
    const pattern = /^[^s@]+@[^s@]+.[^s@]+$/;
    return pattern.test(email);
}

This function uses the test() method of the regular expression object to check if the given email parameter matches the specified pattern. The pattern in this example is quite simple and checks for a string that contains the ‘@’ symbol and a period, with no spaces. To use this function, simply call it with an email address as its argument:

console.log(isValidEmailAddress("[email protected]")); // true
console.log(isValidEmailAddress("invalid_email.com")); // false

Method 2: Using the HTML5 Email Constraint

Another way to validate an email address is by using the HTML5 email constraint. This method requires you to add an input element with the type attribute set to “email” and use the checkValidity() method to validate the input value.

Here’s an example of how to use the HTML5 email constraint:

function isValidEmailAddress(email) {
    const input = document.createElement("input");
    input.type = "email";
    input.value = email;
    return input.checkValidity();
}

This function creates a new input element with the type attribute set to “email” and then assigns the given email value to it. Finally, it calls the checkValidity() method to check if the email address is valid. To use this function, call it with an email address as its argument:

console.log(isValidEmailAddress("[email protected]")); // true
console.log(isValidEmailAddress("invalid_email.com")); // false

Conclusion

In this post, we’ve discussed two methods for validating an email address in JavaScript: using regular expressions and the HTML5 email constraint. Both methods have their advantages and can be used depending on your specific requirements. Regular expressions offer more flexibility and customization, while the HTML5 email constraint provides a more straightforward approach with built-in browser validation.