How to get size of mongodb single document in bytes using nodejs?

Question

I'm fetching a document using db.coll.findOne. I wanted to get size of the document in bytes using nodejs with only mongo-native driver.can it be possible?

"Object.bsonsize" execute only in mongoshell i need to get size of document in node.js application — Narayansingh Rajput
– Narayansingh Rajput, Commented Jan 13, 2016 at 13:28

Shanoor · Accepted Answer · 2016-01-13 13:58:05Z

5

It is possible using BSON (it's a dependency of the mongodb driver):

var bson = require("bson");
var BSON = new bson.BSONPure.BSON();

db.coll.findOne(query).then(function(err, doc) {
  var size = BSON.calculateObjectSize(doc);
});

edited Jan 13, 2016 at 13:58

answered Jan 13, 2016 at 13:29

Shanoor

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3 Comments

Narayansingh Rajput Over a year ago

i was able to get size values.but it differs from "Object.bsonsize" value is there any reason for the difference in size?

Shanoor Over a year ago

I don't know why exactly but a guess: Object.bsonsize() returns the true size of the stored document, calculateObjectSize() will only try to calculate it (the name is a good indicator :p) so anything thing can lead to a different calculated size.

Mr. Goferito Over a year ago

I had to change it to new bson.BSON() to get it working. I guess the api changed since 2013.

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