Multiple MongoDB database Connections in NodeJS

Hello, I have always created a single connection with one connection string. My question is, how to create multiple connections(MongoDB instances) if an array of connection strings are given in NodeJs get API?

Let’s say multiple connection strings will have the same type of database. e.g., my database name is “University” and this database is available in all different locations. And I wanted to write one common API which will provide me with an array of universities from different connections, how to do it?

Example connectionString1 = mongodb://localhost:27017
connectionString2 = mongodb://localhost:27018
connectionString3 = mongodb://localhost:27019

Now I wanted to connect with all three connection strings and fetch all records from it and send it
in a response to one common API, how can I do it in an efficient manner?

Your input will help me to understand this structure in better way