gzip-size 
Get the gzipped size of a string or buffer
Install
$ npm install --save gzip-size
Usage
var gzipSize = require('gzip-size');
var string = 'Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus.';
console.log(string.length);
//=> 191
console.log(gzipSize.sync(string));
//=> 78
API
gzipSize(input, callback)
gzipSize.sync(input)
input
Type: string, buffer
callback(error, size)
Type: function
gzipSize.stream()
Returns a passthrough stream. The stream emits a gzip-size event and has a gzipSize property.
Related
- gzip-size-cli - CLI for this module
License
MIT © Sindre Sorhus