Node.js MongoDB insertion takes too much time - node.js

Question

I have a certain loop where I'm inserting documents in a MongoDB collection.But only the last document is inserted,may be,the loop is too fast for the insertion.
How can I make the loop wait for the completion of the insertion?
Here is my code:
mongo.connect(url, function(err, db) {
if (err) throw err;
var dbo = db.db("mydb");
for (var i = 0; i < totalEmployee; i++) {
var some = array_data[index].split(":");
var thing = some[1].split("\"");
var EID = thing[1];
var Info = [];
index++;
for (var j = 0; j < 2; j++) {
var some = array_data[index].split(":");
var thing = some[1].split("\"");
var first = thing[1];
thing = some[2].split("\"");
var second = thing[0];
Info[j] = first + ":" + second;
index++;
}
console.log(Info);
var unique = date + EID;
dbo.collection("Attendance").find({_id: unique}).toArray(function (err, result) {
if (!result.length) {
dbo.collection("Attendance").insertOne({
_id: unique,
Date: date,
EID: EID,
InTime: Info[0],
OutTime: Info[1]
},function(err, res) {
if (err) throw err;
console.log("1 document inserted");
inserted=false;
}
);
}
else {
console.log(unique+date+EID+Info[0]);
var myquery = {_id: unique};
var newvalues = {$set: {Date: date, EID: EID, InTime: Info[0], OutTime: Info[1]}};
dbo.collection("Attendance").updateOne(myquery, newvalues, function (err, res) {
if (err) throw err;
console.log("1 document updated");
inserted=false;
});
}
}
}
});