Email Validation is a library that validates email addresses and checks againts more than 10K domains used for disposable emails If you want to block disposable email addresses at signup, or if you are a B2B company and want only professional email adresses, this is the solution for you :)

This library does multiple verifications:

• Email format validation
• Free email address (@gmail.com, @hotmail.com, @protonmail.com, ...)
• Disposable email address (@maildrop.cc, @fakemail.net, @trashmail.com, ...)
• Possible typos in popular email domains

Email Validation has 0 dependency, 100% coverage, and is fully configurable.

Table of Contents

• Installation
• Usage
• Configuration
• Result
• Contributions
• License

Installation

Install using npm:

npm install fakemail-guard

or Yarn yarn:

yarn add fakemail-guard

Usage

Email Validation is initialized with a list of default domains

Simple usage example

const EmailValidation = require('fakemail-guard')
const ev = new EmailValidation()

// This email will be invalid because it is a free email
const result = ev.check('[email protected]')
console.log(`${result.email} validity: ${result.valid}`)

// This email will be invalid because it is a disposable email
const result2 = ev.check('[email protected]')
console.log(`${result2.email} validity: ${result2.valid}`)

// You can also check for possible typos
const result3 = ev.check('[email protected]')
if (result3.typo) console.log(`Did you mean ${result3.typo}?`)

The output will be an object with some information on the validity (see result section)

Configuration

Email Validation can be configured with more advanced options as an object:

• whitelist (Array) Add some email domains you want to whitelist (default is [])
• blacklist (Array) Add some email domains you want to blacklist (default is [])
• allowFreemail (Boolean) Allow free emails such as @gmail.com, ... (default is false)
• allowDisposable (Boolean) Allow disposable emails such as @trashmail.com, ... (default is false)

You can for example choose to allow freemails, and add a domain baddomain.com in addition to the preconfigured list

Advanced configuration example

const EmailValidation = require('fakemail-guard')
const ev = new EmailValidation({ allowFreemail: true, blacklist: ['baddomain.com'] })

// This one should have result.valid = true because we allowed free mails such as gmail.com
ev.check('[email protected]')

// But this one is blacklisted now
ev.check('[email protected]')

Or if you want to disallow all free mails, except gmail.com :

const ev = new EmailValidation({ whitelist: ['gmail.com'] })

You can check some examples in example.js

Updating options on the fly

In case you need to update options after initialization, you can do it on the fly with different methods:

• whitelist (Function) Add a new domain to the whitelist
• blacklist (Function) Add a new domain to the blacklist
• setOptions (Function) Changes the options

const EmailValidation = require('fakemail-guard')
const ev = new EmailValidation()

// This adds a new domain as invalid
ev.blacklist('baddomain.com')

// This marks a domain as valid
ev.whitelist('gooddomain.com')

// This changes options to allow freemails
ev.setOptions({ allowFreemail: true })

Result

Email Validation will output an object with the following information:

• email (String) Email in a standardized format (trimed and lowercased)
• domain (String) Domain from the email
• valid (Boolean) Is the email address valid?
• errors (Array) List of errors if any
• typo (String) Is there any possible typo in the email?

Errors contains strings and can be one of :

• invalid Email is not present of format is invalid
• disposable Email is disposable (and not whitelisted or allowed in parameters)
• freemail Email is a free mail (and not whitelisted or allowed in parameters)
• blacklisted Email is blacklisted in parameters

Example :

const EmailValidation = require('fakemail-guard')
const ev = new EmailValidation()

const result = ev.check('[email protected]')
console.log(result)

// This will return :
// {
//   email: '[email protected]',
//   domain: 'gmail.com'
//   valid: false,
//   errors: ['freemail'],
//   typo: null
// {

Contributions

If you need a simple way to add domains to the list, just run yarn add-domain [DOMAIN] [CATEGORY]

For example yarn add-domain freemail gmail.com

Then feel free to create Pull Requests :)

Licence

MIT License