Invalid Hook Call Warning

You are probably here because you got the following error message:

Hooks can only be called inside the body of a function component.

There are three common reasons you might be seeing it:

1. You might have mismatching versions of React and React DOM.
2. You might be breaking the Rules of Hooks.
3. You might have more than one copy of React in the same app.

Let’s look at each of these cases.

Mismatching Versions of React and React DOM

You might be using a version of react-dom (< 16.8.0) or react-native (< 0.59) that doesn’t yet support Hooks. You can run npm ls react-dom or npm ls react-native in your application folder to check which version you’re using. If you find more than one of them, this might also create problems (more on that below).

Breaking the Rules of Hooks

You can only call Hooks while React is rendering a function component:

• ✅ Call them at the top level in the body of a function component.
• ✅ Call them at the top level in the body of a custom Hook.

Learn more about this in the Rules of Hooks.

function Counter() {
  // ✅ Good: top-level in a function component  const [count, setCount] = useState(0);  // ...
}

function useWindowWidth() {
  // ✅ Good: top-level in a custom Hook  const [width, setWidth] = useState(window.innerWidth);  // ...
}

To avoid confusion, it’s not supported to call Hooks in other cases:

• 🔴 Do not call Hooks in class components.
• 🔴 Do not call in event handlers.
• 🔴 Do not call Hooks inside functions passed to useMemo, useReducer, or useEffect.

If you break these rules, you might see this error.

function Bad1() {
  function handleClick() {
    // 🔴 Bad: inside an event handler (to fix, move it outside!)    const theme = useContext(ThemeContext);  }
  // ...
}

function Bad2() {
  const style = useMemo(() => {
    // 🔴 Bad: inside useMemo (to fix, move it outside!)    const theme = useContext(ThemeContext);    return createStyle(theme);
  });
  // ...
}

class Bad3 extends React.Component {
  render() {
    // 🔴 Bad: inside a class component    useEffect(() => {})    // ...
  }
}

You can use the eslint-plugin-react-hooks plugin to catch some of these mistakes.

Note

Custom Hooks may call other Hooks (that’s their whole purpose). This works because custom Hooks are also supposed to only be called while a function component is rendering.

Duplicate React

In order for Hooks to work, the react import from your application code needs to resolve to the same module as the react import from inside the react-dom package.

If these react imports resolve to two different exports objects, you will see this warning. This may happen if you accidentally end up with two copies of the react package.

If you use Node for package management, you can run this check in your project folder:

npm ls react

If you see more than one React, you’ll need to figure out why this happens and fix your dependency tree. For example, maybe a library you’re using incorrectly specifies react as a dependency (rather than a peer dependency). Until that library is fixed, Yarn resolutions is one possible workaround.

You can also try to debug this problem by adding some logs and restarting your development server:

// Add this in node_modules/react-dom/index.js
window.React1 = require('react');

// Add this in your component file
require('react-dom');
window.React2 = require('react');
console.log(window.React1 === window.React2);

If it prints false then you might have two Reacts and need to figure out why that happened. This issue includes some common reasons encountered by the community.

This problem can also come up when you use npm link or an equivalent. In that case, your bundler might “see” two Reacts — one in application folder and one in your library folder. Assuming myapp and mylib are sibling folders, one possible fix is to run npm link ../myapp/node_modules/react from mylib. This should make the library use the application’s React copy.

Note

In general, React supports using multiple independent copies on one page (for example, if an app and a third-party widget both use it). It only breaks if require('react') resolves differently between the component and the react-dom copy it was rendered with.

Other Causes

If none of this worked, please comment in this issue and we’ll try to help. Try to create a small reproducing example — you might discover the problem as you’re doing it.