var zlib-sync = require('zlib-sync');
    
    //DEFLATE Format RFC-1951 
    var compress = zlib-sync.deflatecompress //zlib-sync.rfc1951compress; 
    var uncompress = zlib-sync.deflateuncompress //zlib-sync.rfc1951uncompress; 
    
    var rawData = fs.readFileSync("/etc/passwd");
 
    var compressed   = compress(rawData);
    var uncompressed = uncompress(compressed);
 
    uncompressed == rawData // true! 
    
    //ZLIB format RFC-1950 
    compress = zlib-sync.zlibcompress //zlib-sync.rfc1950compress; 
    uncompress = zlib-sync.zlibuncompress //zlib-sync.rfc1950uncompress; 
    
    compressed   = compress(rawData);
    uncompressed = uncompress(compressed);
 
    uncompressed == rawData // true! 
    
    //GZIP format RFC-1952 
    compress = zlib-sync.gzipcompress //zlib-sync.rfc1952compress; 
    uncompress = zlib-sync.gzipuncompress //zlib-sync.rfc1952uncompress; 
    
    compressed   = compress(rawData);
    uncompressed = uncompress(compressed);
 
    uncompressed == rawData // true! 
 

 
zlib/gzip/deflatecompress(data, [options]) 
    data - String or Buffer
    options - options object
 
The options are
    1 <= options.compressionLevel <= 9
    8 <= options.windowBits  >= 15
    1 <= options.memlevel >= 9
    0 <= options.strategy => 4
        0 - Z_DEFAULT_STRATEGY,
        1 - Z_FILTERED
        2 - Z_HUFFMAN_ONLY
        3 - Z_RLE
        4 - Z_FIXED
    
 
zlib/gzip/deflateuncompress(data, [windowbits])
    8 <= windowBits => 15