DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect.

mongoose.connect("mongodb://localhost:27017/YourDB", { useNewUrlParser: true });

MongoClient.connect("mongodb://localhost:27017/YourDB", { useNewUrlParser: true })

mongoose.connect("mongodb://localhost:27017/YourDB", { useNewUrlParser: true });