Buffer

buf = new Buffer(26);
for (var i = 0 ; i < 26 ; i++) {
    buf[i] = i + 97;
}
console.log( buf.toString('ascii',3,10));
// outputs: abcdefghijklmnopqrstuvwxyz


//=======buffer to JSON=======
let buff=new Buffer("the computer is an electronic","ascii");
console.log('=====JSON==========');
console.log(buff.toJSON());
console.log('=====JSON==========');