There is a tool called node-stream-zip.

It can extract AND read zip files.

https://github.com/antelle/node-stream-zip

 import {StreamZip} from 'node-stream-zip';

    //Will return true if the zip contains html
    const containsHTML = async (file) => 
    {
    const zip = new StreamZip.async({ file: file });

    const entriesCount = await zip.entriesCount;
    console.log(`Entries read: ${entriesCount}`);
    
    const entries = await zip.entries();
    let found = false;
    for (const entry of Object.values(entries)) {
        if(entry.name.endsWith(".html") found = true; break; //We found the html
      }
    // Do not forget to close the file once you're done
    await zip.close();
    return found;
    
    
    }

There is a tool called node-stream-zip.

This would be a good solution to my problem, but this is a nodeJS lib and it seems that using it in React-Native will not work.

Using node-stream-zip in my react-native app produces this error:

[Error: undefined Unable to resolve module fs from node_stream_zip.js: fs could not be found within the project or in these directories: node_modules let fs = require('fs');]

Here is my code:

import ReactNativeBlobUtil from "react-native-blob-util";
import StreamZip from "node-stream-zip";

const fileName = "zipFile.zip";

const App = () => {

useEffect(() => {
    const start = async () => {
        let dirs = ReactNativeBlobUtil.fs.dirs;
        await initCopyFromAsset();

        const zip = new StreamZip.async({ file: dirs.DocumentDir + "/" + fileName });

    };

    start();
}, []);