How to Unzip Multiple .gz Files Using NodeJS and ZLib on Windows 10

Last Updated: June 20, 2019By PinoyITSolutionTags: .gz, GZip, Javascript, NodeJS, Uncompress, Unzip, windows 10, ZLib

Steps on how to uncompress multiple .gz files using NodeJS and zlib:

1. Import fs and zlib.

var zlib = require(‘zlib’);
var fs = require(‘fs’);

2. Create function to that will decompress files using zlib.createUnzip();.

function decompress(inFilename, outFilename) {
var unzip = zlib.createUnzip();
var input = fs.createReadStream(inFilename);
var output = fs.createWriteStream(outFilename);input.pipe(unzip).pipe(output);
}

3. Call function as many times as you need. Please take note that my .gz files are located on assets/models/ folder.

decompress(‘assets/models/CLH_Computer.mtl.gz’, ‘assets/models/CLH_Computer.mtl’);
decompress(‘assets/models/CLH_Computer.obj.gz’, ‘assets/models/CLH_Computer.obj’);
decompress(‘assets/models/CLH_ep2_computer_high_poly.mtl.gz’, ‘assets/models/CLH_ep2_computer_high_poly.mtl’);
decompress(‘assets/models/CLH_ep2_computer_high_poly.obj.gz’, ‘assets/models/CLH_ep2_computer_high_poly.obj’);
decompress(‘assets/models/CLH_ep2_cyc_wall.mtl.gz’, ‘assets/models/CLH_ep2_cyc_wall.mtl’);
decompress(‘assets/models/CLH_ep2_cyc_wall.obj.gz’, ‘assets/models/CLH_ep2_cyc_wall.obj’);
decompress(‘assets/models/CLH_Shuttle.mtl.gz’, ‘assets/models/CLH_Shuttle.mtl’);
decompress(‘assets/models/CLH_Shuttle.obj.gz’, ‘assets/models/CLH_Shuttle.obj’);

4. Put it all together in a .js file and save it as unzip.js on your root folder. If you plan to put everything in one location, just remove assets/models/ from the code.

var zlib = require(‘zlib’);
var fs = require(‘fs’);

function decompress(inFilename, outFilename) {
var unzip = zlib.createUnzip();
var input = fs.createReadStream(inFilename);
var output = fs.createWriteStream(outFilename);input.pipe(unzip).pipe(output);
}

decompress(‘assets/models/CLH_Computer.mtl.gz’, ‘assets/models/CLH_Computer.mtl’);
decompress(‘assets/models/CLH_Computer.obj.gz’, ‘assets/models/CLH_Computer.obj’);
decompress(‘assets/models/CLH_ep2_computer_high_poly.mtl.gz’, ‘assets/models/CLH_ep2_computer_high_poly.mtl’);
decompress(‘assets/models/CLH_ep2_computer_high_poly.obj.gz’, ‘assets/models/CLH_ep2_computer_high_poly.obj’);
decompress(‘assets/models/CLH_ep2_cyc_wall.mtl.gz’, ‘assets/models/CLH_ep2_cyc_wall.mtl’);
decompress(‘assets/models/CLH_ep2_cyc_wall.obj.gz’, ‘assets/models/CLH_ep2_cyc_wall.obj’);
decompress(‘assets/models/CLH_Shuttle.mtl.gz’, ‘assets/models/CLH_Shuttle.mtl’);
decompress(‘assets/models/CLH_Shuttle.obj.gz’, ‘assets/models/CLH_Shuttle.obj’);

5. Call the unzip.js file by running the following command on your command line.

node unzip.js

There you have it. Hope that helps.

You can get the full code from here too. https://gist.github.com/ronknight/30052b89edf4a13bf8351bab9e3fe819

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