The MERN Stack

MERN is MEAN's cooler younger sibling who showed up to the party wearing React instead of Angular and immediately became more popular. MongoDB still stores your documents, Express still routes your requests, and Node.js still runs your server — but React brings the component-based UI magic that makes frontend developers feel like they're building with Lego instead of wrestling with spaghetti. It dominates bootcamp curricula worldwide, which means roughly 40% of all junior developer portfolios are built on it.