Why is Verifying An Email Address Important with Node.js?
Verifying an email address is important because it helps you to eliminate fake IDs from your database. So, you can get access to real clients and grow your business. Also, it prevents spammers from signing up using disposable email IDs, like those from Mailinator. You don't want to see fake people registering on your site. Your business will fail miserably. To ensure that your database is clean and you are interacting with only the real people, it's very important to verify email addresses with Node.js and perform Node email validation.
How Do I Check if An Email is Valid in Node?
You can verify email addresses in Node and perform Node email validation easily by utilizing Deep Email Validator. It can perform the validation effectively by checking the local part for common typos, DNS records, and the SMTP server response. Also, it can determine if the email ID is generated by disposable email services - it should return true.
You just need to follow these steps:
1. First, you have to install Deep Email Validator by using this command:
npm install deep-email-validator
2. Then you have to create the logic for performing the verification. It will look like this:
const express = require('express');
const router = express.Router();
const emailValidator = require('deep-email-validator');
async function isEmailValid(email) {
return emailValidator.validate(email)
}
3. When the asynchronous function is run, you will get this response:
{
valid: false,
validators: {
regex: { valid: true },
typo: { valid: true },
disposable: { valid: true },
mx: { valid: true },
smtp: { valid: false, reason: 'Mailbox not found.' }
},
reason: 'smtp'
}
As you can see, Deep Email Validator runs five different checks to ensure the validity of the email address. In this case, the ID is invalid because there is an issue with SMTP. The mailbox is not found. That's why the valid field is set to false and the reason field is set to smtp. It should not return false.
4. Now, you can create a simple route by utilizing the logic shown in the previous step:
router.post('/register', async function(req, res, next) {
const {email, password} = req.body;
if (!email || !password){
return res.status(400).send({
message: "Email or password missing."
})
}
const {valid, reason, validators} = await isEmailValid(email);
if (valid) return res.send({message: "OK"});
return res.status(400).send({
message: "Please provide a valid email address.",
reason: validators[reason].reason
})
});
Here, you have defined a POST method for preventing the use of fake email addresses during user registration. If the email ID or password is not entered, a message will be displayed accordingly. Also, if an invalid email address is entered, the reason behind the issue will be displayed.
That's how you utilize Deep Email Validator with Node.js. By using this code, you can verify the email address effectively and perform Node email validation.
What the Node email validation code works for
Detecting common typos
Deep Email Validator utilizes Mailcheck, which is a simple email typo-detection library. It comes with a list of common domain names. It can detect common typos by using the Sift4 algorithm to compare the domain name of the given email address to the existing list.
How does the Sift4 algorithm work? It works by determining Levenshtein Distance, which is the minimum number of single-character edits required to be made for transforming one string to another. For example, let's consider these two email addresses:
'mail@yahoo.com'
'mail@yahooo.com'
As you can see, the second email ID is invalid, as it has an extra 'o.' If you delete it, both of the email addresses will become the same. So, it takes only one edit to transform the second string to the first one. That's why they have a Levenshtein Distance of 1.
Detecting a temporary email address
Temporary email addresses are identified by utilizing a package, called disposable-email-addresses. It contains a list of common disposable email address hosts, which are scraped from Wikipedia disposable email service list. They are matched against the provided email address to ensure validity.
Read More: How to do Web Scraping in Node.js
Checking for MX records
Mail Exchange (MX) records are DNS records. They are used to specify a mail server to handle a domain's email. You must configure it to receive emails to your domain.
Deep Email Validator utilizes Node's in-built 'dns' module internally to query the DNS servers and determine the validity of MX records. Domains with invalid MX records will produce an error.
Determining whether an SMTP server is online
SMTP stands for Simple Mail Transfer Protocol. Mail servers use it to send, receive, and relay outgoing mail between email senders and receivers.
Deep Email Validator utilizes Node's in-built 'net' library to connect to the default SMTP port 25. Then it queries to determine the existence of the given mailbox. If everything is fine, the server responds with a 250 OK message - that's a great sign.
Abstract's Email Validation and Verification API verifies the email addresses on your database effectively by checking typos, SMTP server response, and MX records. Also, it looks for disposable email ID providers. Try it now for free.
Best Node Email Validation Packages
There are plenty of Node email validation packages for Node.js. But which is the best Node email validation package? Let's take a look at them.
1. Kickbox
Kickbox is a Node email validation package which helps you to reduce bounce rates by eliminating invalid email addresses. Also, it prevents spammers from registering into your Node.js application by using fake IDs.
2. Node-email-validation
Node-email-validation is a simple module for verifying email IDs. It is fast, robust, and easy to use.
3. Sumars-js
Sumars-js is a simple user management and registration system for Node.js. It enables you to verify the email addresses used for registration conveniently.
4. Isemail
Isemail is an email address validation library for Node.js. It helps you to validate the IDs according to RFCs 5321, 5322, and others.
5. Email-addresses
Email-addresses is a Node.js library. You can use it to parse the email IDs using the grammar specified in RFC 5322. In this way, you can easily check whether the user-provided email address is genuine or not.
Alternatives to Node Email Validation
The solution that has been mentioned in this post works pretty well. However, there is a limitation. It will require extra time and effort for maintaining the code. That means you will have to go through extra hassles. Is there any alternative way that can make your life a lot easier?
You can try using Abstract's Email Validation and Verification API. It is lightweight and super-fast. But more importantly, it is completely hassle-free. It doesn't need extra effort for maintaining the code. Abstract deals with everything. So, you can save a lot of time.
Let's take a look at a practical example by verifying this email address with Abstract's Email Validation and Verification API: johnsmith@gmail.com
https://emailvalidation.abstractapi.com/v1/
? api_key = YOUR_UNIQUE_API_KEY
& email = johnsmith@gmail.com
If the request is successful, you will get this JSON response:
{
"email": "johnsmith@gmail.com",
"autocorrect": "",
"is_valid_format": true,
"is_free_email": true,
"is_disposable_email": false,
"is_role_email": false,
"is_catchall_email": false,
"is_mx_found": true,
"is_smtp_valid": true,
"quality_score": 0.99,
}
Notice that "is_valid_format" is set to true. That means the given email address has the correct format. Also, you get a variety of useful data, like quality score, email role, SMTP validation, etc.
As you can see, Abstract's Email Validation and Verification has made the entire process very simple. It doesn't require you to write any code from scratch. You just need to get the API key and make a request for verifying the email address. So, you don't have to worry about spending extra time maintaining the code. It can make your life a lot easier.
Wrapping up
That's how you validate email addresses in Node.js. You can use the Deep Email Validator package to perform the verification. However, the easiest way is using an email validation API. It will enable you to avoid all the extra hassles and perform validation effortlessly.
Node Email Validation FAQs
How do I know if a Node.js email is real?
You can identify the real email address in Node.js easily by using the Deep Email Validator package. It can eliminate fake email IDs efficiently by checking common typos, DNS records, and the SMTP server response. However, it will require you to maintain the code, which means extra hassle.
If you don't want to face hassle, you can try using Abstract's Email Validation and Verification API. It will allow you to detect the real email IDs without worrying about maintaining the code.
Can you check if an email address is active?
You can check if an email address is active by pinging the email box via the SMTP connection. Simply connect to the SMTP server and request if the email ID exists. If it's active, you will get the "250 OK" response. If it's no longer active, you will get a negative response, like this: "550-5.1.1 User Unknown."
The easiest way to find the active email address is using one of the best email validation APIs. You just need to make an API call and pass the email ID. If you get a positive response, like "is_smtp_valid": true, the email ID is fully active.
Frequently Asked Questions
What is email validation in Node.js?
Email validation in Node.js is the process of checking whether an email address is correctly formatted and actually usable before it enters your system. It can cover basic format checks using regex, typo detection, disposable address filtering, MX DNS record lookups, and SMTP-level mailbox verification, all achievable within a Node.js application.
How do you validate an email address in Node.js?
A common approach is to install a package like deep-email-validator via npm, then call its validation function with async/await inside a route handler. The package uses Node's built-in DNS module to check MX records and the net library to test SMTP connectivity on port 25, giving you a structured response that includes a validity flag and a specific failure reason.
What is the difference between email validation and email verification in Node.js?
Validation checks that an address is correctly formatted and that the domain infrastructure exists; it can be done entirely server-side without sending anything. Verification goes a step further by confirming a real person owns the inbox, typically by sending an activation link or code that the user must click to confirm their address.
When should I use a Node.js package versus an email validation API?
A local package like deep-email-validator works well for projects where you want to avoid external dependencies, but it requires you to maintain the disposable-domain lists and SMTP logic yourself. An API service like Abstract's email validation handles maintenance, updates its own databases, and returns enriched data like quality scores, making it a better fit when reliability and low ongoing effort matter more than keeping all logic in-house.
How do I detect disposable email addresses in Node.js?
The deep-email-validator package bundles a disposable-email-addresses list (sourced from Wikipedia) that it checks against during validation. When a submitted domain matches a known throwaway provider, the validator returns a failure with the disposable check as the reason, letting you reject or flag that registration before it reaches your database.
What does SMTP validation actually check, and why does it matter in Node.js?
SMTP validation opens a connection to the recipient's mail server and issues a test command to see whether the mailbox exists. A response of "250 OK" means the address is live; "550-5.1.1 User Unknown" means it is not. This is the deepest layer of programmatic validation available without sending a real email, and it catches inactive or misspelled addresses that pass format and MX checks.
