JavaScript | Function to check if email is valid and cleanup if required

checkEmail.js

/*
This function checks if the email is valid and return the email if it is valid or return false if it is not valid
If covers all the modern email formats and top level domains.
*/


const checkEmail = (email, cleanEmail = false) => {
    const cleanUp = () => {
        // Removing all spaces from the email
        email = email.replace(/\s/g, '');
        return email.toLowerCase();
    }
    // Checking if the email is valid
    const emailRegex = /^(([^<>()[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
    email = cleanEmail ? cleanUp(email) : email
    if (emailRegex.test(email)) {
        return email;
    }
    return false;
}

/* Testing the function
console.log(checkEmail('hi@siddharthverma.in'));
console.log(checkEmail('Fraud Email'));
console.log(checkEmail('Email with spaces @siddharthverma .in'));
console.log(checkEmail('hi@sid.black'));
With Clean Up
console.log(checkEmail('Email with spaces @siddharthverma .in', true));
*/