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.