query data and iterate over the matched data

mongo_cursor_iterate.js

var cur = db.tasks.find({
  '$or': [
  {'upload_status': 'active'},
  {'upload_status': 'pending'}]
});

while(cur.hasNext()) {
  printjson(cur.next()); 
}

# or easier yet 
cur.forEach(printjson);

# convert a cursor to an array
var docs = cur.toArray();
var doc = docs[3];