I Built a Zero-Dependency Website Change Detector in Node.js (Open Source)

I needed to know when a competitor changed their pricing page. I didn't want to set up Puppeteer, a headless browser, or a paid monitoring tool. So I built a 50-line Node.js script using the SnapAPI analyze endpoint. Here's how it works — and it's fully open source. The core pattern Instead of scraping raw HTML and trying to parse it, SnapAPI's /v1/analyze returns structured data about a page: the primary CTA text, word count, detected tech stack, navigation items. The script saves a snapshot of this data after each run, then diffs it against the previous snapshot on the next run. Here's the key logic: async function analyzeUrl ( url ) { return new Promise (( resolve , reject ) => { const endpoint = `https://api.snapapi.tech/v1/analyze?url= ${ encodeURIComponent ( url )} &api_key= ${ API_KEY } ` ; const req = https . get ( endpoint , ( res ) => { let body = '' ; res . on ( ' data ' , chunk => { body += chunk ; }); res . on ( ' end ' , () => { if ( res . statusCode !== 200 ) return reje