Compressing multiple files using zlib

Question

The below code will compress one file. How can I compress multiple files

var gzip = zlib.createGzip(); var fs = require('fs'); var inp = fs.createReadStream('input.txt'); var out = fs.createWriteStream('input.txt.gz');  inp.pipe(gzip).pipe(out); 

Answer 1

Gzip is an algorithm that compresses a string of data. It knows nothing about files or folders and so can't do what you want by itself. What you can do is use an archiver tool to build a single archive file, and then use gzip to compress the data that makes up the archive:

• https://github.com/mafintosh/tar-stream

Also see this answer for more information: Node.js - Zip/Unzip a folder

Answer 2

The best package for this (and the only one still maintained and properly documented) seems to be archiver

var fs = require('fs'); var archiver = require('archiver'); var output = fs.createWriteStream('./example.tar.gz'); var archive = archiver('tar', {     gzip: true,     zlib: { level: 9 } // Sets the compression level. });  archive.on('error', function(err) {   throw err; });  // pipe archive data to the output file archive.pipe(output);  // append files archive.file('/path/to/file0.txt', {name: 'file0-or-change-this-whatever.txt'}); archive.file('/path/to/README.md', {name: 'foobar.md'});  // Wait for streams to complete archive.finalize();