in this challenge i opened the source code and found this code, that generates the password, also the username is admin.
the password is JavaScriptIsSecure, i’ve found it using running this line in the console:
String.fromCharCode(74,97,118,97,83,99,114,105,112,116,73,115,83,101,99,117,114,101)

Flag: FLAG-66Jq5u688he0y46564481WRh