How to Extract Emails from Any Website — Node.js Guide

Need to find email addresses on a website? Here is a clean approach using regex patterns and DNS validation. The Approach Most email extraction tools just use a simple regex. But for production use, you need: Multiple regex patterns to catch different email formats DNS MX record validation to verify the domain exists Filtering out false positives (image filenames, CSS classes) Deduplication The Regex const EMAIL_REGEX = / [ a-zA-Z0-9._%+- ] +@ [ a-zA-Z0-9.- ] + \.[ a-zA-Z ]{2,} /g ; This catches 99% of email formats. But raw results need cleaning: function cleanEmails ( rawEmails ) { return [... new Set ( rawEmails )] . map ( e => e . toLowerCase (). trim ()) . filter ( e => ! e . endsWith ( " .png " )) . filter ( e => ! e . endsWith ( " .jpg " )) . filter ( e => ! e . includes ( " example.com " )); } MX Record Validation import dns from " dns/promises " ; async function validateDomain ( domain ) { try { const mx = await dns . resolveMx ( domain ); return mx . length > 0 ; } catch { re