How to get complete cache data in ReactJS ?

26 Apr, 2021
We can use the following approach in ReactJS to get all cache data. We can get all cache data from the browser and use it in our application whenever needed. Caching is a technique that helps us to stores a copy of a given resource into our browser and serves it back when requested.
Approach: Follow these simple steps in order to get all cache data in ReactJS. We have created our getAllCacheData function which gets all data from the browser cache. When we click on the button, the function is triggered and data gets fetched from the cache. In the following example, we are trying to fetch all cache data from the browser which has five caches named CacheOne, CacheTwo, CacheThree, CacheFour, and CacheFive as shown below:
Creating React Application:
Step 1: Create a React application using the following command:npx create-react-app foldername
Step 1: Create a React application using the following command:
npx create-react-app foldername
Step 2: After creating your project folder i.e. foldername, move to it using the following command:cd foldername
Step 2: After creating your project folder i.e. foldername, move to it using the following command:
cd foldername
Project Structure: It will look like the following.
Project Structure
App.js: Now write down the following code in the App.js file. Here, App is our default component where we have written our code.
Javascript
import * as React from 'react';  export default function App() {    // Our state to store fetched cache data  const [cacheData, setCacheData] = React.useState();    // Function to get all cache data  const getAllCacheData = async () => {    var url = 'https://localhost:300'      // List of all caches present in browser    var names = await caches.keys()      var cacheDataArray = []      // Iterating over the list of caches    names.forEach(async(name) => {        // Opening that particular cache      const cacheStorage = await caches.open(name);        // Fetching that particular cache data      const cachedResponse = await cacheStorage.match(url);      var data = await cachedResponse.json()        // Pushing fetched data into our cacheDataArray      cacheDataArray.push(data)      setCacheData(cacheDataArray.join(', '))    })  };    return (    <div style={{ height: 500, width: '80%' }}>      <h4>How to get all cache data in ReactJS?</h4>      <button onClick={() => getAllCacheData()} >        Get All Cache Data</button>  <br />      <h6>All Cache Data is: {cacheData}</h6>    </div>  );}
Step to Run Application: Run the application using the following command from the root directory of the project:
npm start
Output: Now open your browser and go to http://localhost:3000/, you will see the following output:
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