Express.js collection.find() return Object

Question

I am wanted to display every documents stored in my mongodb. I tried following code which simply get collection.find() and display through res.send()

router.get('/index', function(req,res){
var db = req.db
var collection = db.get('usercollection')

var display = util.inspect(collection.find()));
res.send(display);
});

I expected it to display the actual document stored in mongodb. But instead, it displayed this object format:

{cold:{manager:{driver:[Object], helper:[Object], collection:[Object].....

Is there any other steps needed to display raw mongodb document?

thats a MEAN stack bro

Rafael
– Rafael

2014-12-11 05:07:24 +00:00
Commented Dec 11, 2014 at 5:07 — Rafael
– Rafael, Commented Dec 11, 2014 at 5:07

code_monk · Accepted Answer · 2014-12-11 15:33:15Z

1

If the library you are using is the official 10gen library, then you can't simply output collection.find() without unwinding it. The easiest way to do that for smaller datasets is

collection.find().toArray(function(err, results) {
  if (err) {
      // do something error-y
  } else {
      res.send( results );
  }
});

If you post more of your code, and tag your question with the libraries you are using, you'll be able to get more targeted help. If the library you are using returns a promise, this is probably how you'd unwind it:

collection.find().then(function(results){
    res.send(results);
}).catch(function(err){
    console.error(err);
});

edited Dec 11, 2014 at 15:33

answered Dec 11, 2014 at 5:45

code_monk

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4 Comments

thefourtheye Over a year ago

I believe, you can use res.send only once per request.

Taewan Over a year ago

Thanks! This was exactly what I tried after I explored StackOverflow. I have an error says "Object #<Promise> has no method 'toArray'. Seems toArray is not default method?

code_monk Over a year ago

i've updated my answer to include my best guess on how you'd handle the Promise return object.

code_monk Over a year ago

@thefourtheye, res.end() is the function you can only use once. res.send can be used as many times as you like. @Taewan should note that the response needs to be explicitly closed. Many people just use res.end( response_object ) once to send and close in one go, relieving you of having to remember close the connection

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