How to solve project startup error?

Question

MongoDB

Error when launching www.js

(node:10102) 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.
Redis connected.
Unable to connect to the mongoDb: { MongoError: Authentication failed.
    at Function._getError (/var/www/html/languagelab/node_modules/mongoose/node_modules/mongodb-core/lib/auth/scram.js:125:14)
    at sendAuthCommand (/var/www/html/languagelab/node_modules/mongoose/node_modules/mongodb-core/lib/auth/scram.js:175:31)
    at Connection.messageHandler (/var/www/html/languagelab/node_modules/mongoose/node_modules/mongodb-core/lib/connection/connect.js:334:5)
    at emitTwo (events.js:126:13)
    at Connection.emit (events.js:214:7)
    at processMessage (/var/www/html/languagelab/node_modules/mongoose/node_modules/mongodb-core/lib/connection/connection.js:364:10)
    at Socket.<anonymous> (/var/www/html/languagelab/node_modules/mongoose/node_modules/mongodb-core/lib/connection/connection.js:533:15)
    at emitOne (events.js:116:13)
    at Socket.emit (events.js:211:7)
    at addChunk (_stream_readable.js:263:12)
    at readableAddChunk (_stream_readable.js:250:11)
    at Socket.Readable.push (_stream_readable.js:208:10)
    at TCP.onread (net.js:601:20) name: 'MongoError', [Symbol(mongoErrorContextSymbol)]: {} }

I read that you need to write {useNewUrlParser: true }, but I don't understand where to write...

Answer 1

write in mongo database connection string
https://stackoverflow.com/a/51182415
If you are using version >= 3.1.0 change you mongo connection file to ->
MongoClient.connect("mongodb://localhost:27017/YourDB", { useNewUrlParser: true })
or your mongoose connection file to ->
mongoose. connect("mongodb://localhost:27017/YourDB", { useNewUrlParser: true });
but here the error "MongoError: Authentication failed." falls out, that is, is the path to the database correctly written? or the username or password does not match