How to Build an Email Finder That Actually Works (Node.js)

Email finders are one of the most valuable scraping tools. Here is how to build one that finds real emails. Method 1: Scrape from Websites const cheerio = require ( " cheerio " ); async function findEmails ( url ) { const res = await fetch ( url , { headers : { " User-Agent " : " EmailBot/1.0 " } }); const html = await res . text (); const $ = cheerio . load ( html ); $ ( " script, style " ). remove (); const text = $ ( " body " ). text (); const emails = [... new Set ( ( text . match ( / [ a-zA-Z0-9._%+- ] +@ [ a-zA-Z0-9.- ] + \.[ a-zA-Z ]{2,} /g ) || []) . filter ( e => ! e . includes ( " example.com " ) && ! e . includes ( " noreply " )) )]; // Also check mailto links $ ( " a[href^=mailto:] " ). each (( i , el ) => { const e = $ ( el ). attr ( " href " ). replace ( " mailto: " , "" ). split ( " ? " )[ 0 ]; if ( ! emails . includes ( e )) emails . push ( e ); }); return emails ; } Method 2: Pattern-Based Guessing function guessEmails ( name , domain ) { const [ first , last ] = name