What does the Master Key in Parse Cloud?

Question

Could somebody explain me in brief that what does the master key within Parse Cloud Code?

Is it possible that a recently implemented CC function (which

Answer 1

The master key overrides all security, such as ACL or Class-based permissions. It is like the "root" password.

You should invoke it only when needed, because all methods for the current request after it is enabled with Parse.Cloud.useMasterKey(); will use the master key.

You can selectively use it by passing options to the individual query/save/etc methods.

query.find({ useMasterKey: true }).then(function(results) { // ...

object.save(null, { useMasterKey: true }).then( // ...