Break large JSON into an array of smaller objects. I made this for Google Apps Script to break large API results into smaller chunks for moving into Firebase. This assumes that each key in the object is a record.

gistfile1.txt

function splitObject_TEST(){Logger.log(splitObject({1:11,2:22,3:33,4:44,5:55,6:66,7:77}, 3))}

function splitObject(data, size){
  if(Object.keys(data).length <= size)
    return [data];
  
  var count = 0;
  var out = [];
  for (var key in data) {
    var bowl = Math.floor((count++)/size);
    if( ! out[bowl] ) out[bowl] = {};
    out[bowl][key] = data[key];
  }
  
  return out;
}