LearnJS: JavaScript Tutorial

Write your first JavaScript line today, and build real apps by the end.

LearnJS is a complete JavaScript course built for your phone. Whether you're a total beginner or preparing for a JavaScript interview, our step-by-step roadmap guides you through every concept with a built-in JavaScript compiler, so you write real code on the same screen you learn.

No laptop needed. Code, run, and debug JavaScript directly from your phone.

WHY LEARNJS?

Built-in JavaScript compiler - write and run real code instantly on mobile

Project-driven curriculum - build functional JavaScript projects, not toy examples

Visual roadmaps - see your learning path, unlock each topic step by step

Gamified streaks and achievements - build a daily JavaScript practice habit

Quiz after every topic - solidify what you've learned before moving on

Covers Beginner to Advanced: ES6, async/await, OOP, DOM manipulation

BUILT-IN JS COMPILER

Our mobile JavaScript compiler gives you a full editor with syntax highlighting, auto-indentation, and quick-access tabs for common syntax (const, function, console.log, arrow functions). Run your code and see console output instantly - no setup, no IDE required.

WHAT YOU'LL LEARN

Beginner: Variables, data types, operators, conditionals, loops

Intermediate: Functions, arrays (map/filter/reduce), objects, error handling, regex

Advanced: DOM manipulation, OOP, closures, hoisting, Promises, async/await, ES6 modules

TRACK YOUR PROGRESS

See daily streaks, quiz accuracy, compiler runs, chapters completed, and earned badges — all in one profile dashboard. Customise your editor theme and set daily reminders to keep your JavaScript learning streak going.

PERFECT FOR

Beginners starting their JavaScript journey from zero

Students preparing for CS exams and JavaScript interview questions

Developers building JavaScript projects for their portfolio

Anyone getting ready for React, Vue, or Node.js frameworks

Download LearnJS — the JavaScript compiler app that makes you actually write code.

Start your first lesson in under 60 seconds.