Back End Development and APIs

What you'll learn

Back End Development and APIs is freeCodeCamp's answer to the front-end-heavy way most people learn to code: it moves you server-side, into Node.js and Express, where requests get handled, data gets validated, and APIs actually get built rather than just consumed.

Who it's for

This is aimed at developers who can already build a page but have never had to think about routes, middleware, or how a server responds to a request — the other half of full stack that a lot of tutorials skip. Node and Express are still the default starting point for JavaScript back-end work, so the skills transfer directly to real jobs and side projects.

It's free and comes with freeCodeCamp's certification, making it a low-risk way to round out a front-end-only skill set before calling yourself full stack.