/Javascript/Express/== operation is not working on ids in express

== operation is not working on ids in express

Mongoose uses the mongodb-native driver, which uses the custom ObjectID type.
You can compare ObjectIDs with the .equals() method.
With your example, results.userId.equals(AnotherMongoDocument._id).
The ObjectID type also has a toString() method, if you wish to store a stringified version of the ObjectID in JSON 
format, or a cookie.

If you use ObjectID = require("mongodb").ObjectID (requires the mongodb-native 
library) you can check if results.userId is a valid identifier with 
  results.userId instanceof ObjectID.

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