How to Monitor Page Load Time and Core Web Vitals Across Your Entire Site (Node.js)

Stop guessing your site speed — monitor it systematically. One script, any number of pages, run it weekly. The problem with Lighthouse Lighthouse is great for debugging one page. But when you're managing a SaaS landing page, 20 blog posts, and an e-commerce catalog, "run Lighthouse manually" isn't a workflow — it's wishful thinking. You need: All your pages checked on a schedule A flag when any page exceeds your latency threshold Zero manual steps Here's how to build that in about 30 lines of Node.js. What the analyze endpoint returns We'll use the SnapAPI analyze endpoint , which headlessly loads a page and returns structured performance + content data: { "url" : "https://example.com" , "load_time_ms" : 1842 , "word_count" : 1204 , "technologies" : [ "React" , "Vercel" , "Google Analytics" ], "buttons" : [ "Get started" , "Sign in" , "View demo" ], "forms" : [{ "id" : "signup" , "fields" : 3 }], "headings" : [ "Why Example beats the competition" , "Pricing" ], "links" : [ "https://exa