Master React Debugging with the Power of useDebugValue

Effortlessly Debug Your React Components with useDebugValue

useDebugValue is a hook in React that is used to display a value in the React developer tools next to the component that calls the hook. It is useful for debugging and for providing a label for the value in the React developer tools.

Here is an example of how useDebugValue can be used:

function MyComponent() {
  const value = useSomeCustomHook();
  useDebugValue(value);
  return <div>{value}</div>;
}

In this example, the value returned from the useSomeCustomHook hook will be displayed in the React developer tools next to the MyComponent component. This can be useful for quickly understanding the state of a component and how it is being used in the application.

Here are a few more examples of how useDebugValue can be used in a React application:

Example 1:

function MyCounter() {
  const [count, setCount] = useState(0);
  useDebugValue(count, (value) => `Count: ${value}`);
  return (
    <div>
      <button onClick={() => setCount(count + 1)}>Increment</button>
      <div>{count}</div>
    </div>
  );
}

In this example, the current count value will be displayed in the React developer tools next to the MyCounter component, with the label “Count: {count}“.

Example 2:

function MyForm() {
  const [formData, setFormData] = useState({});
  useDebugValue(formData, (data) => `Form Data: ${JSON.stringify(data)}`);
  return (
    <form>
      <input name="name" value={formData.name} onChange={(e) => setFormData({ ...formData, name: e.target.value })} />
      <input name="email" value={formData.email} onChange={(e) => setFormData({ ...formData, email: e.target.value })} />
      <button type="submit">Submit</button>
    </form>
  );
}

In this example, the current form data will be displayed in the React developer tools next to the MyForm component, with the label “Form Data: {formData}“. This can be useful for quickly understanding the state of the form and how it is being used in the application.

Example 3:

function MyAPIWrapper() {
  const [data, setData] = useState(null);
  useDebugValue(data, (value) => `API Data: ${value ? 'Loaded' : 'Loading...'}`);
  useEffect(() => {
    const fetchData = async () => {
      const result = await someAPI.getData();
      setData(result);
    };
    fetchData();
  }, []);
  return (
    <div>
      {data ? <MyComponent data={data} /> : <div>Loading...</div>}
    </div>
  );
}

In this example, the current data value will be displayed in the React developer tools next to the MyAPIWrapper component, with the label “API Data: {data ? ‘Loaded’ : ‘Loading…’}“. This can be useful for quickly understanding the state of the data and whether it has finished loading or not.