I am using nodejs version 10.15 and mongodb driver version 3.2.3 and mongojs driver version 2.6.0.

When I am using the readPreference=secondaryPreferred method and replicateSet option i n the mongojs connection url, I am getting Not Master mongo error when using the findAndModify collection method.

Connection string example
 
db = mongojs(mongodb://userId:password@1:27018,2:27018,3:27018/dbName?readPreference=secondaryPreferred&maxStalenessSeconds=120&replicaSet=test);