Custom middleware

Now I understand your point, your question (sorry the delay, hahaha).
But the answer to get if the request are using the master key on login for examples you just use the triggers that Parse has: Cloud Code Guide | Parse

Parse.Cloud.beforeLogin(async (req) => {
  const { master }  = req
  console.log('master', master)
})

About this error: the endpoint to login is “/login”, POST request. Works fine on my tests here, even using master key.

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