gistfile1.txt

var compress = require('compress');
var gzip = require('gzip');
var zlib = require('zlib');
  
function deflate(buffer, callback) {
    var gz = new compress.Gzip();
    var data = '';
    gz.write(buffer, function(err, chunk) {
        if (err) {
            callback(err);
            callback = undefined;
        }
        else data += chunk;
    });
    gz.close(function(err, chunk) {
        if (err) {
            if (callback) callback(err);
        }
        else data = callback(null, data + chunk);
    });
}


var json = new Buffer("{'a':'b'}");

deflate(json, function(err, data) {
    if (err) throw err;
    console.log('compress: ' + data);
});


gzip(json , function(err, data){
      if (err) throw err;
      // By default:
      //   compression = 8
      //   encoding = utf8
      console.log('gzip: ' + data.toString());
});

console.log('zlib: ' + zlib.deflate(json).toString());