cross-email-validator

Goes beyond validating the characters that make up the email, and additionally performs DNS and mailbox checks to ensure that the email address is valid. Does all the network calls using cross-fetch, so it works in the browser, on React Native, on Node, and anywhere else you want to run it.

Synposis

Install

yarn add react-native-email-validator

Execute

import validateEmail from "react-native-email-validator"

await validateEmail("[email protected]"); // returns true
await validateEmail("@beewell.health"); // returns false
await validateEmail("developer+rnev@health"); // returns false

Validation Phases

Step 1: Syntax

These are performed sequentially.

• It first ensures that the value is a non-empty string, that the character '@' is in the address precisely once, and that '@' is not the first or last character.
• It then checks that the TLD is in the TLD list given by tlds.
• Then uses validator/lib/isEmail for validating the e-mail address format. This does an extensive amount of checks, with a whole suite of checks specifically for @gmail.com addresses.

Step 2: Network Checks

These are performed concurrenctly.

• Calls out to the 1.1.1.1 DNS over HTTPS server to ensure that there exists at least one MX record for the domain.
• At the same time, calls out to the Kickbox "disposable email" API to validate that the e-mail domain is not a disposable email domain.
• It'd be nice to do an SMTP check, but it's unclear how to do that from within React Native without unlinking.

Note that any network check that errors out will be counted as a pass. So if there is no internet, the internet connection is slow, or the server is down, then it is equivalent to the network check returning valid.

License

MIT. See the file named LICENSE in this directory for details.

Inspiration

email-deep-validator