@jrc03c/email-validator

Install

npm install --save https://github.com/jrc03c/email-validator

Use

In Node:

const emailValidator = require("@jrc03c/email-validator")

In the browser:

<script src="path/to/email-validator.js"></script>

Then:

emailValidator.fetchTopLevelDomainList().then(() => {
  const isValid = emailValidator.validate("[e-mail]")

  if (isValid) {
    // Yay!
  } else {
    // Uh-oh!
  }
})

By default, the top-level domain list is fetched from here. However, if you prefer, you can pass your own URL from which to fetch the list:

emailValidator.fetchTopLevelDomainList(myListUrl)

As I write this, the Fetch API has not yet been implemented in Node; so this library includes its own version written from scratch. My version definitely doesn't implement the full Fetch API; in fact, it's just useful enough to fetch a plain text file from a URL, and that's all. But I wrote it myself because I didn't want to rely on any third-party libraries. If for some reason you are working in Node and you need to fetch the top-level domain list using a more complicated request (e.g., a POST request, or a request that requires certain headers, etc.), or if you just don't just the way I've written my own fetch function, then you'll need to write your own version or import a library like node-fetch and then do your own fetching:

const emailValidator = require("@jrc03c/email-validator")
const fetch = require("node-fetch")

fetch(myListUrl, myFancyOptions).then(response => {
  // parse the response to retrieve your list, and then:
  emailValidator.topLevelDomainList = myFancyList

  const isValid = emailValidator.validate("[e-mail]")
  // ...
})