Start instantly
Open the editor and run code immediately, with no account, no build step, and no unnecessary screens.
Playground + Learn in one clean flow
Write fast. Learn clean.
LiveJS combines a fast JavaScript playground with practical guides for HTML, CSS, and JavaScript. Open it, learn a concept, change the code, and see the result instantly without setup or clutter.
0 install
Open it and start writing directly in the browser.
Monaco editor
Autocomplete, IntelliSense, and clear output.
3 learning tracks
HTML, CSS, and JS with practical examples.
Learn by editing
The Learn experience is part of the product flow. Move from a guide straight into the editor and test the idea immediately.
Keep the screen clean
The home page focuses on the essential actions: open the editor, understand the product, and jump into Learn.
Features
Built to move from idea to output fast
Everything you need to test, understand, and iterate quickly, without a crowded interface.
Instant execution
Your code runs immediately and shows output without refreshes or extra steps.
Auto-runMonaco inside
The same engine behind VS Code for autocomplete, IntelliSense, and more precise editing.
VS Code engineReadable output
The console presents objects and values clearly, so feedback is easy to follow.
Debug fasterAuto-save local
Your work stays in the browser exactly as you left it, without depending on a server.
PersistentModern JS support
Top-level await and modern JavaScript flows work out of the box.
Modern JSPrivate by default
Your code stays local, and the experience remains simple and predictable.
Client-side
Learn
Learn in the same product where you practice
The home page makes the learning path explicit: pick a topic, understand the concept, then take it straight into the editor. No artificial split between tutorial and execution.
3 tracks
HTML, CSS, and JavaScript.
Practical examples
Examples built around real interfaces and real logic.
Direct editor flow
Learn and test without changing context.
HTML
Structure pages that make sense
Learn semantic markup, forms, and reusable content blocks for real pages.
Semantic
Forms
Media
Tables
Start HTML →
CSS
Style interfaces with intention
Learn layout, spacing, color, and responsive patterns without turning the UI into a visual compromise.
Flexbox
Grid
Variables
Responsive
Start CSS →
JavaScript
Make interfaces behave
Cover logic, state, DOM, and async flows through examples you can run and modify immediately.
Functions
DOM
Async
APIs
Start JavaScript →
Paths
Choose the route that matches what you want to build
These shortcuts strengthen the path between learning, experimenting, and using browser packages, while keeping the homepage clean.
Learn the front-end stack
Start in the learning hub and move through HTML, CSS, and JavaScript in one connected flow.
Open Learn Hub →Use browser packages
Explore package examples, CDN loading, and browser-friendly npm workflows without bundling.
Browse Packages →Practice immediately
Skip straight to the editor when you want to prototype an idea and validate it with live output.
Launch Editor →
Themes
Pick a mood, not a setup
The showcase is reduced to a few strong, useful options. Click one and open the editor with that theme already active.
const result = "clean"; console.log(result);
VS Dark
const focus = "ship"; console.log(focus);
GitHub Dark
const theme = "dracula"; console.log(theme);
Dracula
const night = true; console.log(night);
Night Owl
One place to learn and build
Open the editor for fast prototypes or go to Learn for a more guided path.
No account required · Fast in browser · Clean by default