npm install gzip
var gzip = require('gzip');
gzip('some text', function(err, data){
// By default:
// compression = 8
// encoding = utf8
console.log(data);
});
gzip('some text', 'ascii', function(err, data){
// Change encoding
console.log(data);
});
gzip(buffer, 4, function(err, data){
// Gzip buffer with compression rate = 4
console.log(data);
});