Cannot Connect to MongDB Atlas using Mongoose
问题 I am starting to learn a MERN stack tutorial. I initially created a react app, added a directory called backend, installed express, cors, express, and dotenv, then created a server.js and added some code, but after connecting to mongodb atlas, I get the error below: (node:5828) UnhandledPromiseRejectionWarning: MongoTimeoutError: Server selection timed out after 30000 ms at Timeout. (C:\Users\Lenovo\Desktop\REACTion\mernapp\backend\node_modules\mongodb\lib\core\sdam\topology.js:878:9) at