MongoDB validation allowing everything - mongodb

Question

I'm starting to use MongoDB node driver and I can't get validation to work at all.
I created the following validation objects using query:
validator: { $in: [
{ name: { $type: "string" } }
]}
And this JSON Schema:
validator: {
$jsonSchema: {
bsonType: "object",
required: ["name"],
properties: {
name: {
bsonType: "string",
description: "is required and must be a string"
}
}
}
}
Then if I try to insert the following document with this structure {name: 2}, it gets added no failed validation whatsoever.
I've read the mongo and the node driver docs up and down regarding document validation and can't find a way to get this validated. I'm currently using Mongo version 3.6.7 and the node driver version 3.1.4, on an express server version 4.16.3.
This is the whole code:
// create a single user
const createSingleUser = (client, db) => {
db.collection("users").insertOne({
name: 2
}, (err, response) => {
if (err) console.warn(err);
console.log("new user added!!!!");
client.close();
}); // insert one
};
// create collection and add validator
const createUserCollection = client => {
const MongoDriverData = client.db("MongoDriverData");
// create the collection and add validation
MongoDriverData.createCollection( "users", {
validator: {
$jsonSchema: {
bsonType: "object",
required: ["name"],
properties: {
name: {
bsonType: "string",
description: "is required and must be a string"
}
}
}
}, // validator
validationAction: "error"
}, (err, results) => {
console.log( "Collection created!!!" );
// now insert a user
createSingleUser(client, MongoDriverData);
});
};