MongoDB not able to save data through node.js from url http://www.reddit.com/r/technology/.json -

i trying save data reddit collection following error keep coming

mongoerror: error parsing element 0 of field documents :: caused :: wrong type '0' field, expected object, found 0: "stories"

now stuck in please help

here code please let me know missing.

var mongoclient = require('mongodb').mongoclient,     request = require('request');     mongoclient.connect('mongodb://localhost:27017/course', function (err, db) {         if (err) throw err;         request('http://reddit.com/r/technology/.json', function (err, response, body) {             if (!err && response.statuscode == 200) {                 var obj = json.parse(body);                 var stories = obj.data.children.map(function (story) {                     return story.data;                 });                 console.dir(stories);                 db.collection('reddit').insert('stories', function (err, data) {                     if (err) throw err;                     console.dir(data);                     db.close();                 });             }          });     });