Email Validation In JavaScript

Email Validation in JavaScript – onlinecode

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There are numerous solutions out there for validating an email address in JavaScript, depending on how strict you want to be with your validation.
In this tutorial, you’ll learn about 3 different options and the tradeoffs between them.

Write Your Own Regular Expression

The quick and easy approach is to write a regular expression that validates whether a string is a correctly formatted
email address. One simple approach I’ve used in the past is checking if the string looks like xx@yy.zz:

/^[^@]+@w+(.w+)+w$/.test(str);

This regular expression is fairly concise and handles many common cases. If you don’t need to be especially strict
about validation, this regexp can be helpful.

/^[^@]+@w+(.w+)+w$/.test('foo@bar.co'); // true
/^[^@]+@w+(.w+)+w$/.test('foo.bar@baz.co'); // true
/^[^@]+@w+(.w+)+w$/.test('foo@bar.c'); // false, TLD must be at least 2 chars
/^[^@]+@w+(.w+)+w$/.test('foo@bar'); // false
/^[^@]+@w+(.w+)+w$/.test('bar.co'); // false

However, there are many rules that the above regular expression doesn’t account for. For example, the “personal info”
part of an email address (everything before ‘@’) cannot contain square braces []. There are
more sophisticated regexps that handle most of the edge cases,
for example:

/^[-!#$%&'*+/0-9=?A-Z^_a-z'{|}~](.?[-!#$%&'*+/0-9=?A-Z^_a-z'{|}~])*@[a-zA-Z0-9](-*.?[a-zA-Z0-9])*.[a-zA-Z](-?[a-zA-Z0-9])+$/

However, this regular expression still doesn’t handle all edge cases. For example, the personal info part of the email
address cannot be more than 64 characters. Because of this, writing your own email validation regexp is typically not
a good choice, unless you’re certain you only want a quick spot check as to whether an email is valid.

2. Use an npm Module

The email-validator npm module is a more robust check for whether a
string is a syntactically valid email address. It handles several rules that regular expressions can’t check, for example:

const { validate } = require('email-validator');

validate('foo@bar.co'); // true
validate('this-personal-info-is-too-long-it-must-be-less-than-64-characters@bar.co'); // false

The email-validator module is a great choice most of the time. It handles the complex regular expressions and various
rules so you don’t have to. You should use email-validator or something similar, unless you have
a compelling reason to write your own regular expression.

3. Use an API

Regular expressions and email-validator only check the syntax of the email address, not if it is an actual email
address. For example, foo@bar.baz is a syntactically valid email address, but sending an email to that address from
Mailgun will fail because baz is not a valid TLD.

There are several APIs for validating email addresses, like Mailgun and Kickbox. These APIs perform additional validation by talking to the actual mail server and
verifying that the email exists.

For example, here’s how you can use Axios to validate an email against Kickbox’s validation API:

const email = 'notexist@karpov.io';
const apiKey = 'your key here';

const res = await axios.get('https://api.kickbox.com/v2/verify', { params: { email, apiKey } });

res.data.result; // 'undeliverable', because the email address doesn't exist

These APIs are also not foolproof: some mail servers don’t allow tools like Mailgun or Kickbox to check whether
an individual email address exists, to block email scraping. However, if you want to make absolutely certain that
users are signing up with valid emails, and you’re willing to pay to maximize deliverability, using an API is a good choice.

JavaScript Fundamentals

JavaScript is a programming language that is used to create interactive web pages. It is a client-side scripting language, which means that it runs on the user’s browser. JavaScript can be used to add animation, interactivity, and functionality to web pages.

Here are some of the fundamentals of JavaScript:

Variables: Variables are used to store data. They are declared using the var keyword.
Data types: JavaScript has a variety of data types, including strings, numbers, booleans, objects, and arrays.
Operators: Operators are used to perform operations on data.
Control flow statements: Control flow statements allow you to control the order in which your code is executed.
Functions: Functions are blocks of code that can be reused.
Objects: Objects are used to store data in key-value pairs.
Arrays: Arrays are used to store data in a sequential order.
Events and event handlers: Events are notifications that are sent by the browser when something happens, such as when the user clicks on an element or moves the mouse over an element. Event handlers are functions that are called in response to an event.
DOM manipulation: The Document Object Model (DOM) is a tree-like structure that represents the elements of a web page. JavaScript can be used to manipulate the DOM to change the appearance or behavior of a web page.

These are just some of the fundamentals of JavaScript. There are many other concepts that you can learn as you continue to develop your skills.

Here are some resources that you can use to learn more about JavaScript:

Mozilla Developer Network (MDN): The MDN is a great resource for learning about JavaScript. It has a comprehensive reference guide, tutorials, and articles on a wide range of topics.
W3Schools: W3Schools is another great resource for learning about JavaScript. It has interactive tutorials and quizzes that can help you learn the basics of the language.
JavaScript.info: JavaScript.info is a website that provides in-depth tutorials on JavaScript. It also has a forum where you can ask questions and get help from other JavaScript developers.

I hope this helps!

Here are some additional tips for learning JavaScript:

Start with the basics: Before you start trying to build complex applications, it’s important to learn the basics of JavaScript. This includes things like variables, data types, operators, and control flow statements.
Practice regularly: The best way to learn JavaScript is to practice regularly. Try to find some time each day to work on JavaScript projects.
Get help from others: If you get stuck, don’t be afraid to ask for help from others. There are many online forums and communities where you can get help from other JavaScript developers.

With a little practice, you’ll be able to learn JavaScript and start building amazing web applications.

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