var request = require('request');
var JSONStream = require('JSONStream');
var Writable = require('readable-stream').Writable;

request('https://api.github.com/users/substack/repos', {
  headers: { 'User-Agent': 'request' }
})
.pipe(JSONStream.parse('*.name'))
.pipe(ws(3));

function ws (num) {
  var s = Writable();
  var rows = [];
  var j = 0, i;
  s._write = function (row, enc, next) {
    if (!rows[i = parseInt(j/num, 10)]) rows[i] = [];
    rows[i][j%num] = row.toString();
    j += 1;
    next();
  }
  s.on('finish', function () {
    console.log(rows);
  });
  return s;
}