Free Email Spell Checker — Catch Misspelled Emails in JavaScript | SMASHSEND

Frequently asked questions

Does the checker send my users' emails anywhere?

No. The library runs entirely in the browser and makes zero network requests. Addresses are compared against a local dictionary of popular domains and TLDs, so nothing is ever transmitted or stored.

Is this the same as email verification?

Not quite — it's complementary. The spell checker fixes obvious typos at the point of entry (like gmaik.co → gmail.com). To confirm an address is real, deliverable, and not disposable, use SMASHSEND's Email Verification add-on, which checks MX records, mailbox existence, and known spam-trap domains.

Can I customize the suggestions?

Yes. Pass your own domains, topLevelDomains, threshold values, or even a custom distance function to run() to tune it for your specific audience.

How much does it cost?

The library is free and open source (MIT). It's built and maintained by the team behind SMASHSEND — the email platform that helps you turn every clean signup into a customer.