How can i read a json file in gzip?

Question

There is an archive format gzip. There are json files. We need to get each file in turn , to do with it and what is written in the other gzip. I realized that I need to use the standard library createReadStream and zlib.

Answer 1

Well, following the example from https://nodejs.org/api/zlib.html#zlib_examples the following process could be done for a single gzipped file:

var unzip = zlib.createUnzip();
var fs = require('fs');
var inp = fs.createReadStream('input.json.gz');
var out = fs.createWriteStream('output.json');

inp.pipe(unzip).pipe(out);

However if there are multiple files within a gzip, I am not sure how one would go about doing that. I could not find documentation to do that and the only way I found that multiple files could be unzipped from a gzip file in node is if they were tar'd first. A process for unzipping tar.gz in node can be found here. Following that example, one could do something like this:

var unzip = zlib.createUnzip();
var fs = require('fs');
var tar = require('tar-fs');
var inp = fs.createReadStream('input.tar.gz');
var out = './output'; // output directory

inp.pipe(unzip).pipe(tar.extract(out));