This Node app is intended to demonstrate how to connect to the Mongo replica set deployed from the template in Railway
You should set the following variables in the service configuration in Railway:
COLLECTION_NAME=nodeCollection
DATABASE_NAME=railway
MONGO_HOSTS=${{mongo1.RAILWAY_PRIVATE_DOMAIN}}:27017,${{mongo2.RAILWAY_PRIVATE_DOMAIN}}:27017,${{mongo3.RAILWAY_PRIVATE_DOMAIN}}:27017
MONGO_URI=mongodb://${{mongo1.MONGO_INITDB_ROOT_USERNAME}}:${{mongo1.MONGO_INITDB_ROOT_PASSWORD}}@${{MONGO_HOSTS}}/?replicaSet=${{REPLICA_SET_NAME}}
REPLICA_SET_NAME=${{mongo1.REPLICA_SET_NAME}}