How to download and unzip a zip file in memory in Node?

To download and unzip a zip file in memory in Node, we use the adm-zip module.

To install it, we run

npm install adm-zip

Then we write

const fileUrl =
  "https://github.com/mihaifm/linq/releases/download/3.1.1/linq.js-3.1.1.zip";

const AdmZip = require("adm-zip");
const request = require("request");

request.get({ url: fileUrl, encoding: null }, (err, res, body) => {
  const zip = new AdmZip(body);
  const zipEntries = zip.getEntries();
  console.log(zipEntries.length);

  zipEntries.forEach((entry) => {
    if (entry.entryName.match(/readme/i)) console.log(zip.readAsText(entry));
  });
});

to call request.get with an object with the url of the file to unzip.

We get the zip file’s content from body.

And then we call getEntries to get the items in the zip file.