What is a TransientTransactionError in Mongoose (or MongoDB)?

Question

I have server.js and db.js The db.js file interacts with my database using Mongoose and I use server.js to call functions

Answer 1

I had this problem when trying to connect my Heroku app to a MongoDB Atlas database.

If you do a on you terminal

heroku logs --tail

You might see

ERROR: { MongoNetworkError: 
connection 4 to cluster0-shard-40-01-qnwp8.mongodb.net:27017 closed
name: 'MongoNetworkError',
errorLabels: [ 'TransientTransactionError' ],
[Symbol(mongoErrorContextSymbol)]: {} }`

After whitelisting the server connection on MongoDB Atlas, the database connection error was resolved.