Read http request's body which has a gzip content encoding (node.js);

gunzip.js

var https = require('https');
var gunzip = require('zlib').createGunzip();

var options = {
    host: 'api.stackexchange.com',
    path: '/2.1/info?site=stackoverflow'
};

https.get(options, function(res) {
    var body = '';

    res.pipe(gunzip);

    gunzip.on('data', function (data) {
        body += data;
    });

    gunzip.on('end', function() {
        console.log(JSON.parse(body));
    });
    
    gunzip.on('error', function(error) {
        console.log(error);
    });
});