Learn JavaScript frameworks by actually building
React, Next.js and more - in a real editor, in your browser. No setup, no video to scrub through. Write the code, run the tests, see it pass.
27challenges
3tracks
18challenges solved
55developers
Terminalpnpm test > frameground@1.0.0 test > vitest runPASS./index.test.jsRenders Button✓Renders Button(5ms)✓Disabled when no user(5ms)✓Updates counter (5ms)Test Suites:1 passed,1 totalTests:3 passed,3 totalSnapshots:0 totalTime:1s, estimated 2sRan all test suites.
Pick a track and start
Curated sequences of challenges that take you from the basics to the parts of a framework people actually get stuck on.
React
Master React, the JavaScript library for building dynamic user interfaces! From basics to advanced concepts.
24 challenges50 enrolled
Next.js App Router
Build with the Next.js App Router - Server Components, nested layouts, streaming, caching and Server Actions.
3 challenges0 enrolledNext.js Pages Router
Build with the Next.js Pages Router - file-based routing, API routes, middleware, and the three ways to render a page.
0 challenges0 enrolled
How it works
Read the brief
Every challenge opens with the problem, the constraints, and the tests it has to satisfy - written the way a ticket would be.
Write it in the editor
A real workspace boots in your browser: file tree, Monaco, a terminal. Nothing to install, nothing to configure.
Run the tests
Jest or Vitest runs against your code and tells you exactly what broke. Pass, and the challenge is marked on your profile.
What's inside
Learning tracks
Curated sequences of challenges that build on each other, so you always know what to attempt next.
Challenges
Problems spanning every difficulty, written for the frameworks you actually ship with.
Real test runs
Jest and Vitest run against your code in the browser and tell you exactly which assertion broke.
Your profile
Every solve is recorded - track your streak, revisit past work, and publish your solutions.
Ready to write some code?
Sign in with GitHub, enroll in a track, and solve your first challenge in the next ten minutes.