Result Size: 625 x 571
demo_mongodb_find_fields_error.js:
​x
 
var MongoClient = require('mongodb').MongoClient;
var url = "mongodb://localhost:27017/mydb";
​
MongoClient.connect(url, function(err, db) {
  if (err) throw err;
  //Exclude "address" field in the result:
  db.collection("customers").find({}, { projection: { name: 1, address: 0 } }).toArray(function(err, result) {
    if (err) throw err;
    console.log(result);
    db.close();
  });
});
​
C:\Users\My Name>node demo_mongodb_find_fields_error.js
C:\Users\Your Name\node_modules\mongodb\lib\utils.js98
    process.nextTick(function() { throw err; });
                                  ^
MongoError: Projection cannot have a mix of inclusion and exclusion.
...