How to format and validate email node js

Question

I would like that email had format like: [email protected].

Which is the best way to do it?

I have a component for registration and I have the field like this:

<mat-form-field>
              <input matInput placeholder="Email" name="email" [(ngModel)]="email" required>
</mat-form-field>

In my usersRouter I have the function for registration:

router.post('/users/register', (req, res) => {
        ...
        const user = new User({
            ...
            email: req.body.email,
            ...
        });
     ...
});

Also, I use mongo and in the UserSchema I have this for the email:

email: {
        type: String,
        required: true
}

Thanks!

stackoverflow.com/a/49188007/5695162

Vikas
– Vikas

2018-09-22 12:55:21 +00:00
Commented Sep 22, 2018 at 12:55 — Vikas
– Vikas, Commented Sep 22, 2018 at 12:55

Daniel Barral · Accepted Answer · 2019-08-31 21:53:17Z

31

You can use email validator module:

var validator = require("email-validator");
validator.validate("[email protected]");

Or, if you don't want any dependencies:

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

function isEmailValid(email) {
    if (!email)
        return false;

    if(email.length>254)
        return false;

    var valid = emailRegex.test(email);
    if(!valid)
        return false;

    // Further checking of some things regex can't handle
    var parts = email.split("@");
    if(parts[0].length>64)
        return false;

    var domainParts = parts[1].split(".");
    if(domainParts.some(function(part) { return part.length>63; }))
        return false;

    return true;
}

Source:

https://www.npmjs.com/package/email-validator

https://github.com/manishsaraan/email-validator/blob/master/index.js

answered Aug 31, 2019 at 21:53

Daniel Barral

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2 Comments

Muhammad Abubakar Zorrain Over a year ago

there is a problem with timeout. I use email-validator but sometime it show an error as "{"message":"Please provide a valid email address.","reason":"Timeout"}" so my question is how to get rid of this timeout error. Note: when I send mail to this same address by usying gmail account, it is sending.

Don Branson Over a year ago

email-validator fails on 7 of these addresses: codefool.tumblr.com/post/15288874550/…

gr4viton · Accepted Answer · 2018-09-23 09:29:32Z

22

Use regular expression something like that:

Solution 1:

^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$

Sample code:

const emailToValidate = '[email protected]';
const emailRegexp = /^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/;

console.log(emailRegexp.test(emailToValidate));

Solution 2:

Because you use angular, you are able to validate the email on front-end side by using Validators.email.

If you check angular source code of Validators.email here, you will find an EMAIL_REGEXP const variable with the following value:

/^(?=.{1,254}$)(?=.{1,64}@)[-!#$%&'*+/0-9=?A-Z^_`a-z{|}~]+(\.[-!#$%&'*+/0-9=?A-Z^_`a-z{|}~]+)*@[A-Za-z0-9]([A-Za-z0-9-]{0,61}[A-Za-z0-9])?(\.[A-Za-z0-9]([A-Za-z0-9-]{0,61}[A-Za-z0-9])?)*$/;

You could use it on back-end side too, to validate the input.

edited Sep 23, 2018 at 9:29

answered Sep 22, 2018 at 12:24

gr4viton

1,5141 gold badge11 silver badges22 bronze badges

1 Comment

Daniel Barral Over a year ago

Bear in mind that the above solutions allows emails without TLD, like this: a@a

2JN · Accepted Answer · 2022-04-19 21:39:17Z

5

I like validator.js

from the docs:

var validator = require('validator');

validator.isEmail('[email protected]');

source: https://www.npmjs.com/package/validator

answered Apr 19, 2022 at 21:39

2JN

6838 silver badges11 bronze badges

Comments

Mohammed Muzammil · Accepted Answer · 2021-12-03 17:55:05Z

3

In my project i've used email-validator module

npm i email-validator


const emailvalidator = require("email-validator");
if(emailvalidator.validate(req.body.email)){
      // Your call to model here
}else{
   res.status(400).send('Invalid Email');
}

You can install the module from below link

https://www.npmjs.com/package/email-validator

answered Dec 3, 2021 at 17:55

Mohammed Muzammil

7041 gold badge9 silver badges17 bronze badges

2 Comments

Muhammad Abubakar Zorrain Over a year ago

there is a problem with timeout. I use email-validator but sometime it show an error as "{"message":"Please provide a valid email address.","reason":"Timeout"}" so my question is how to get rid of this timeout error. Note: when I send mail to this same address by usying gmail account, it is sending.

danilo Over a year ago

@MuhammadAbubakarZorrain, it seems to be a bug, you can open an issue in the github repository. github.com/manishsaraan/email-validator/issues

pycvalade · Accepted Answer · 2023-07-10 19:40:40Z

0

I like the Joi library for those. Enables you to validate all kinds of things easily!

const Joi = require('joi');

const schema = Joi.string().email().trim();

// "[email protected]"
const validEmail = Joi.attempt('[email protected]', schema);

// trimmed "[email protected]"
const validEmail = Joi.attempt(' [email protected] ', schema);

// throws error
const validEmail = Joi.attempt('john@doe', schema);

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