⚛️ React Playground

Write React code below and click Run. Everything runs in your browser — nothing is sent to our servers. No signup, no install, no nonsense.

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⚛️

React can't run inline (yet)

Some languages need a real compiler or runtime that doesn't fit in a browser. But you can run React instantly on these free platforms:

Open in Replit ↗ Open in OneCompiler ↗

Sample React code:

React example

// React counter
function Counter() {
    const [count, setCount] = useState(0);
    
    return (
        <button onClick={() => setCount(count + 1)}>
            Clicked {count} times
        </button>
    );
}

Try these React examples

Click any example to load it into the editor:

A note on this playground

Code runs in your browser using open-source engines (Pyodide for Python, native JS for JavaScript, AlaSQL for SQL). Nothing is sent to OneCity's servers. No accounts, no tracking. If you save your work, copy-paste it somewhere else — refreshing the page resets the editor.