How to get complete cache data in ReactJS?

Last Updated : 30 Jul, 2024

In React, 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 store a copy of a given resource in our browser and serve it back when requested.

Prerequisites

React JS
CacheStorage

Approach

To get all cache data in React JS define 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:

Steps to create React Application

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

Project Structure:

Project Structure

Example: Get all cache data from the browser cache storage and display on the page when get cache button is clicked

// Filename - App.js

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 () => {
        let url = "https://localhost:300";

        // List of all caches present in browser
        let names = await caches.keys();

        let 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
            );
            let 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>
    );
}