company-email-validator/index.js

Provides a fast company / work email validator by checking whether the email domain is in the free email provider list.

'use strict';

var free_email_provider_set = require('./free_email_provider_domains')
var validator = require("email-validator");

exports.isCompanyEmail = function (email) {
    // Convert email to lowercase for consistent validation
    email = email.toLowerCase();
    
    // 1. first, check if it's a valid email
    if (!validator.validate(email)) {
        return false; // it's not a company email address because it's not valid
    }
    // 2. check if it's a company email
    let fields = email.split('@');
    let domain = fields[1];
    return !free_email_provider_set.has(domain); // if the free provider set doesn't have this domain, then most likely it's a company email address
}

exports.isCompanyDomain = function(domain) {
    // Convert domain to lowercase for consistent validation
    domain = domain.toLowerCase();
    return !free_email_provider_set.has(domain);
}