Comparing the user inputs with the data sets.

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Hi,
I’m trying to create a login page with username and password which are already saved in my own data collection. All I need to know is, when the user inputs their correct credentials (username and password according to the data present in the data collection) he/she must be successfully login into their own profile.
Questions:

  1. How does the user inputs match with the data in the data collection?
  2. Could you help me with the code to make the above issue work?

#Loginpage #matching #userdetails #codequeen #doron