Kebab file names

snippets/use-fetch.md

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+---
+title: React useFetch hook
+tags: hooks,effect,state
+author: chalarangelo
+cover: coworking-space
+firstSeen: 2019-08-21T14:23:57+03:00
+lastUpdated: 2022-05-01T12:50:38+02:00
+---
+
+Implements `fetch()` in a declarative manner.
+
+- Create a custom hook that takes a `url` and `options`.
+- Use the `useState()` hook to initialize the `response`, `error` and `abort` state variables.
+- Use the `useEffect()` hook to asynchronously call `fetch()` and update the state variables accordingly.
+- Create and use an `AbortController` to allow aborting the request. Use it to cancel the request when the component unmounts.
+- Return an object containing the `response`, `error` and `abort` state variables.
+
+```jsx
+const useFetch = (url, options) => {
+  const [response, setResponse] = React.useState(null);
+  const [error, setError] = React.useState(null);
+  const [abort, setAbort] = React.useState(() => {});
+
+  React.useEffect(() => {
+    const fetchData = async () => {
+      try {
+        const abortController = new AbortController();
+        const signal = abortController.signal;
+        setAbort(abortController.abort);
+        const res = await fetch(url, {...options, signal});
+        const json = await res.json();
+        setResponse(json);
+      } catch (error) {
+        setError(error);
+      }
+    };
+    fetchData();
+    return () => {
+      abort();
+    }
+  }, []);
+
+  return { response, error, abort };
+};
+```
+
+```jsx
+const ImageFetch = props => {
+  const res = useFetch('https://dog.ceo/api/breeds/image/random', {});
+  if (!res.response) {
+    return <div>Loading...</div>;
+  }
+  const imageUrl = res.response.message;
+  return (
+    <div>
+      <img src={imageUrl} alt="avatar" width={400} height="auto" />
+    </div>
+  );
+};
+
+ReactDOM.createRoot(document.getElementById('root')).render(
+  <ImageFetch />
+);
+```