React - how to comment source code

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In this article, we would like to show you how to comment source code in React.

Quick solution (inside JSX):

{/* Comment inside React JSX */}

In React JavaScript we have two cases of using comments:

  • For pure JavaScript lines, we use comments such as // single-line comment or /* multi-line comment */,
  • For JSX notation lines we have to wrap them in curly braces additionally.

Practical example:

// ONLINE-RUNNER:browser;

// import React from 'react';
// import ReactDOM from 'react-dom';

const App = () => {
  // const [value, setValue] = React.useState();
    Some comment here..
    Some comment here...
  return (
        //Some comment here...
        //Some comment here...

const root = document.querySelector('#root');
ReactDOM.render(<App />, root);

Inside JSX HTML comments are not supported.

  <!-- This doesn't work! -->


React - comment source code
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