Deprecation notice: ReactDOM.render is no longer supported in React 18

Question

I get this error every time I create a new React app:

Warning: ReactDOM.render is no longer supported in React 18. Use createRoot instead. Until you switch to the new API, your app will behave as if it's running React 17. Learn more: https://reactjs.org/link/switch-to-createroot

How can I fix it?

I created my React app using:

npx create-react-app my-app

Answer 1

In your file index.js, change to:

import React from "react";
import ReactDOM from "react-dom/client";
import "./index.css";
import App from "./App";
import reportWebVitals from "./reportWebVitals";

const root = ReactDOM.createRoot(document.getElementById("root"));
root.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>
);

reportWebVitals();

For Typescript

Credit from comment section below answer: Kibonge Murphy

import React from "react";
import ReactDOM from "react-dom/client";
import "./index.css";
import App from "./App";
import reportWebVitals from "./reportWebVitals";

const root = ReactDOM.createRoot(document.getElementById("root") as HTMLElement);
root.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>
);

reportWebVitals();

Answer 2

React 18 shipped March 29th, 2022. ReactDOM.render has been deprecated in React 18 and currently issues a warning and runs in a compatible mode.

Deprecations

Deprecations

• react-dom: ReactDOM.render has been deprecated. Using it will warn and run your app in React 17 mode.
• react-dom: ReactDOM.hydrate has been deprecated. Using it will warn and run your app in React 17 mode.
• react-dom: ReactDOM.unmountComponentAtNode has been deprecated.
• react-dom: ReactDOM.renderSubtreeIntoContainer has been deprecated.
• react-dom/server: ReactDOMServer.renderToNodeStream has been deprecated.

To resolve it, you can either revert to a previous version of React or update your index.js file to align with the React 18 syntax.

Example:

import { StrictMode } from "react";
import { createRoot } from "react-dom/client";

import App from "./App";

const rootElement = document.getElementById("root");
const root = createRoot(rootElement);

root.render(
  <StrictMode>
    <App />
  </StrictMode>
);

Answer 3

Instead of:

import ReactDOM from 'react-dom'
ReactDom.render(<h1>Your App</h1>, document.getElementById('root'))

Use:

import { createRoot } from 'react-dom/client'
createRoot(document.getElementById('root')).render(<h1>Your App</h1>)

More details here

Answer 4

Before

import { render } from 'react-dom';
const container = document.getElementById('app');
render(<App tab="home" />, container);

After

import { createRoot } from 'react-dom/client';
const container = document.getElementById('app');
const root = createRoot(container);
root.render(<App tab="home" />);

Before in your index.js file:

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import reportWebVitals from './reportWebVitals';

ReactDOM.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>,
  document.getElementById('root')
);


reportWebVitals();

Change it like below into your index.js file:

import React from 'react';

import './index.css';
import App from './App';
import reportWebVitals from './reportWebVitals';

import { createRoot } from 'react-dom/client';
const container = document.getElementById('root');
const root = createRoot(container);
root.render(<React.StrictMode>
  <App />
</React.StrictMode>);


reportWebVitals();

Answer 5

To provide more or less an equivalent to prior versions of React, I use this slightly condensed version of the above, still surrounding the <App> with the <React.StrictMode>.

Another reason I condense this is that - in my specific pipeline - I never need to access the root variable, consequently, chaining statements together makes more sense to me, and the whole file is just five lines of code:

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

import './index.css';
import App from './App';

    ReactDOM.createRoot(document.querySelector("#root")).render(<React.StrictMode><App /></React.StrictMode>);

(P.S.: Don't forget if you need the webvitals functionality to also add to the above code)

Finally, I save this starter code as a Live Template using the WebStorm IDE. Depending on your IDE your snippets may be called differently, but the idea should be similar.

Answer 6

As your error states, ReactDOM.render is no longer supported. So use the new createRoot.

As you can see from the code below, (which was pulled from the documentation) all you have to do is replace ReactDOM.render with createRoot.

// Before
import { render } from 'react-dom';
const container = document.getElementById('app');
render(<App tab="home" />, container);

// After
import { createRoot } from 'react-dom/client';
const container = document.getElementById('app');
const root = createRoot(container);
root.render(<App tab="home" />);

Answer 7

As you said, you created your React app using: npx create-react-app my-app.

• Your index.js must look like this after the command executes.

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import reportWebVitals from './reportWebVitals';

ReactDOM.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>,
  document.getElementById('root')
);

reportWebVitals();

• Your code after edits mentioned in the console

import React from 'react';
import ReactDOM from 'react-dom/client';
import './index.css';
import App from './App';
import reportWebVitals from './reportWebVitals';

const container = document.getElementById('root');
const root = ReactDOM.createRoot(container);
root.render(<App />);

reportWebVitals();

Answer 8

The legacy root API with ReactDOM.render has been deprecated in React 18 and replaced with a new root API using createRoot. The root of your app is the top-level DOM element that contains all of your rendered components, and is usually a <div> with an ID of root.

React 18 still has support for ReactDOM.render so you technically aren't required to update, but you can't be sure how long this support will last.

You can find a lot more information on the difference between ReactDOM.render and createRoot at https://thelonecoder.dev/javascript/react-js/reactdom-render-vs-createroot/.

To update to the new root API, change your index.js file to something like the following:

import { createRoot } from 'react-dom/client';
import App from './App';

const root = createRoot(document.getElementById('root'));
root.render(<App />);

Answer 9

In your index.js file:

import React from "react";
import ReactDOM from "react-dom/client";
import App from "./App";

Use this before React version 18

// ReactDOM.render(
//   <React.StrictMode>
//     <App />
//   </React.StrictMode>,
//   document.getElementById("root")
// );

Use this in React version 18

const root = ReactDOM.createRoot(document.getElementById("root"));
root.render(<App />);

Answer 10

This should do it:

import React from 'react';
import {createRoot}  from 'react-dom/client';
import App from './App';

const root = createRoot(document.getElementById("root"))
root.render
  (
    <App />
  )

Answer 11

If your application is using React-Router, then the following code will work fine:

import { createRoot } from "react-dom/client";
const container = document.getElementById("root");
const root = createRoot(container);
root.render(
  <BrowserRouter>
    <App />
  </BrowserRouter>
);

It will work perfectly (with react-router).

Answer 12

In React 18. For those that are using custom Webpack configurations, follow React Refresh Webpack Plugin. They have some HMR built in.

We are supposed to use fast refresh that has been developed by the React team.

It resolved that error message for me.

Answer 13

import React, {createRoot} from "react";
import ReactDOM from "react-dom/client";
import App from "./App";
import "./styles.css";


const root = ReactDOM.createRoot(document.getElementById("app"));
root.render( <App />);

Answer 14

Use:

import ReactDOM from "react-dom/client";

const element = document.getElementById("root");

// Tell React to take control of that element
// In TypeScript, since there is a bug, you need to add the "!" element!
// https://github.com/DefinitelyTyped/DefinitelyTyped/issues/43848
const root = ReactDOM.createRoot(element!);


const App = () => {
  return (
   <React.StrictMode>
    <div>
      <h1>Hello world!</h1>
    </div>
   </React.StrictMode>
  );
};

root.render(<App />);

Answer 15

Use:

import React, { useEffect } from "react";
import { createRoot } from "react-dom/client";

const App: React.FC<{}> = () => {
  useEffect(() => {
    fetchOpenWeatherData("Toronto")
      .then((data) => console.log(data))
      .catch((err) => console.log(err));
  }, []);

  return (
    <div>
      <img src="icon.png" />
    </div>
  );
};

const rootEl = document.createElement("div");
document.body.appendChild(rootEl);
const root = createRoot(rootEl);
root.render(<App />);