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I'm a beginner in both MongoDB and node.js. Actually, I'm trying to get the names of a particular document but I wonder how to do that. Let me elaborate in detail : if "a" is a collection which contains document named "student" and "student" contains fields like 

{
    "_id: "student",
    "name": "alex",
    "roll": "3",
    "age":"13"
}

then how to get the field names in this ["name","roll","age"] format By trying this:

db.collection("user").find({ "_id": "student" }).toArray(function(err, result) {
    console.log(result)
})

is giving all the fields with their values.

Srinivas Nahak
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2 Answers2

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try :

db.collection("user").find({"_id":"student"}, {name:1}).toArray(function(err, result) {console.log(result)}

if you want to exclude fields :

db.collection("user").find({"_id":"student"}, {roll:0, age:0}).toArray(function(err, result) {console.log(result)}

Taki
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0

This will work:

db.collection("user",function(err,user){
   var array = [];
   user.findOne(function(err,doc){
     for (key in doc) array.push(key);
   });
   console.log(array);
});
wrangler
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