"User is not allowed to do action" following a DeprecationWarning - node.js

Question

While working on some new (very simple) server code, I connected and inserted MongoDB URL code in order to "deploy" it on MongoDB Atlas.
However, I get the following warning:
(node:3396) 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.
This doesn't prevent my code from deploying to the server, and still allows me to send requests with a local testing tool (Postman). However, after my requests are sent, I get the following message in VS Code:
{ MongoError: user is not allowed to do action [insert] on [agenda.contacts]
at Connection.<anonymous> (C:\Users\mymachine\agenda\node_modules\mongodb-core\lib\connection\pool.js:443:61)
at Connection.emit (events.js:198:13)
at processMessage (C:\Users\mymachine\agenda\node_modules\mongodb-core\lib\connection\connection.js:364:10)
at TLSSocket.<anonymous> (C:\Users\mymachine\agenda\node_modules\mongodb-core\lib\connection\connection.js:533:15)
at TLSSocket.emit (events.js:198:13)
at addChunk (_stream_readable.js:288:12)
at readableAddChunk (_stream_readable.js:269:11)
at TLSSocket.Readable.push (_stream_readable.js:224:10)
at TLSWrap.onStreamRead [as onread] (internal/stream_base_commons.js:94:17)
ok: 0,
I suspect this is probably a version error, however this is out of my area of expertise.
My setup is very simple and has only the Atlas cluster connected on MongoDB website.
MongoDB still provides all the analytics I need, so it doesn't seem to have a problem there.
I've already tried changing mongoClient.connect code from useMongoClient: true to useNewUrlParser: true, but it only changes the warning message code from (node:3396) to (node:1092).
mongoose.connect(
'*inserted mongodb url code, copied from CONNECTION STRING ONLY");
{
useNewUrlParser: true
}
Since I have never used MongoDB, I believe my issue is on that software.
I copied the CONNECTION STRING ONLY instead of FULL DRIVER EXAMPLE (both provide a code to insert into my code in VS Code.

Answer 1

As to the (node(1234)) issue solved above, it was in regards to a Warning about a newer version, as to call useNewUrlParser: trueinstead of useMongoClient: true.
As to the "MongoError", I was, instead of hardcoding my password, calling a + process.env.MONGO_ATLAS_PW +and sending my password to file ./nodemon.json.
After changing both errors, code ran smoothly. I, however, will have to find a new way to send password, instead of hardcoding it.
Thank you all who has helped.