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!

Answer 1

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

Answer 2

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.