Archiver reading zip data as a buffer without writing to filesystem


Archiver reading zip data as a buffer without writing to filesystem

Zip data from buffer without writing to filesystem with the Node.js module archiver. All the examples offered in the description of Archiver NPM Module explains how to create a Zip writing to a file. But if you need to write to a stream and return that stream as a buffer, here is an example.

Util function

import archiver from 'archiver'
import { Writable } from 'stream'

/**
 * @param {array<{data: Buffer, name: String}>} files
 * @returns {Promise<Buffer>}
 */
function zipFiles (files) {
  return new Promise((resolve, reject) => {
    const buffs = []

    const converter = new Writable()

    converter._write = (chunk, encoding, cb) => {
      buffs.push(chunk)
      process.nextTick(cb)
    }

    converter.on('finish', () => {
      resolve(Buffer.concat(buffs))
    })

    const archive = archiver('zip', {
      zlib: { level: 9 }
    })

    archive.on('error', err => {
      reject(err)
    })

    archive.pipe(converter)

    for (const file of files) {
      archive.append(file.data, { name: file.name })
    }

    archive.finalize()
  })
}

Usage

const files = [
    ...
    {
        data: Buffer.from('just a buf'),
        name: 'file.txt'
    },
    ...
]

const zipBuffer = zipFiles(files)

Newsletter


Related Posts

What I learned to never do in a presentation meeting

What I learned to never do in a presentation meeting. I had a very bad meeting experience with a gateway provider.

Startup graveyard is a series of killed projects that made millions in revenue per year

Startup graveyard is a series of killed projects that made millions in revenue per year. Just watch their graveyard and do it your own. What better validation do you expect.

How do you detect Credit card type based on the number?

How do you detect Credit card type based on the number using JavaScript? Simple solution using only code, no library required.

Download files in Javascript from Node.js server

How to download files in Javascript, either you use Vue.js, React, Angular, jQuery, or Vanilla JS. On the backend side, we run on Node.js using Express.js.

What books to read

The list of books I read. I decided one year ago to challenge myself and read as many books as I can this year. Take a look at this article and find all of them.

Startup tools for a better version

Are you a startup founder and are you looking for startup tools like invoice, planning or just making money with much automation? Check this article, from founder to founders.

How to use express validator?

How to use express validator through full examples. I found express validator very powerful, but having a poor documentation.

How to check DNS propagation

How to check DNS propagation? Did you changed the DNS records recently and now is not working? Stop crying and check the DNS propagation.

LibraPay library for Nodejs

LibraPay library for Nodejs - integrate Libra Bank online payment gateway using this library for NodeJs.

Opensource Object Storage with Minio

Opensource Object Storage with Minio using Docker. An alternative to AWS S3, Linode Storage, Google Storage, Azure Storage.