About MasterJS

MasterJS is a free, opinionated guide to learning JavaScript end-to-end. Most tutorials are either too shallow ("here is a for loop") or too dense ("here is the entire spec"). This site is the middle ground: the right amount of theory, followed immediately by a runnable example, real practice and a project.

Every topic follows the same structure — explanation, syntax, example, output, common mistakes, practice, mini project — so you spend your energy learning, not figuring out how a new page is organised.

There is no signup, no paywall, no ads. Your progress, bookmarks and theme preference are stored locally in your browser so nothing leaves your machine.

The roadmap covers everything from "what is JavaScript" through DOM manipulation, asynchronous programming and eight full projects. Once you finish, you'll be ready to take on React, Node.js and a database.