Issue in the server.js file mongoose.connect code

[elesq]

The options are not supported on mongoose v6, however, it's the useCreateIndex that was completely crashing a mirror of the repo's code. Wirth updating as came close to abandoning the book as 'outdated' at such an early section (chapter 3)

[uladaharanina]

Yes, it took me a while to figure out why my connection was not working. As I understood, we need to remove this
'useCreateIndex: true' option and the connection will work.

[JimmyJoggins]

Using mongoose 6.9.1 with MongoDB 6.0.3, I was able to establish a connection by doing the following:

1. change the IP from localhost to 127.0.0.1, and
2. remove { useNewUrlParser: true, useCreateIndex: true, useUnifiedTopology: true } from the mongoose.connection() params.

config.js
const config = {
env: process.env.NODE_ENV || 'development',
port: process.env.PORT || 3000,
jwtSecret: process.env.JWT_SECRET || "YOUR_secret_key",
mongoUri: process.env.MONGODB_URI ||
process.env.MONGO_HOST ||
'mongodb://' + (process.env.IP || '127.0.0.1') + ':' + (process.env.MONGO_PORT || '27017') + '/mernproject'
}
export default config

server.js
......
// Connection URL
mongoose.Promise = global.Promise
mongoose.set('strictQuery', false);
mongoose.connect(config.mongoUri)
mongoose.connection.on('error', (err) => {
console.log('MongoDB event error: ' + err);
throw new Error(unable to connect to database: ${config.mongoUri});
})
....

[oriankeith002]

Yes, it took me a while to figure out why my connection was not working. As I understood, we need to remove this 'useCreateIndex: true' option and the connection will work.

Thanks for this tip, just solved the issue using your comment.