I've tried doing the How to Use MERN Stack: A Complete Guide but keep getting an error with the server/db/conn.js file on line 13:
_db = db.db("myFirstDatabase");
There error is:
TypeError: Cannot read property 'db' of undefined
Connecting via the Node code generated by Atlas works just fine. Also, I cloned the GitHub repo and get the exact same error. The actual function call is this:
connectToServer: function (callback) {
client.connect(function (err, db) {
_db = db.db("myFirstDatabase");
return callback(err);
console.log("Successfully connected to MongoDB.");
});
}
But, literally, nothing is getting assigned to the db
parameter when called. The Atlas connection code only has one parameter: err
.
I've tried this on both macOS 11.3.1 and Debion 10.9 and the exact same thing happens. Since it happens on the GitHub code, I know that I'm not the one causing it by accidentally doing something wrong. And, since the Atlas connection code works, I know that the URI is correct.
Please advise on what I need to do to fix this and then please update the website and GitHub with the information as well. Thank you!
Version Numbers:
Node: 14.17.0
Npm: 6.14.13
While this is easy to reproduce and you can get the error info yourself, here it is in all of its glory:
mern-stack-example/mern/server/node_modules/mongodb/lib/utils.js:691
throw error;
^
TypeError: Cannot read property 'db' of undefined
at mern-stack-example/mern/server/db/conn.js:14:16
at mern-stack-example/mern/server/node_modules/mongodb/lib/utils.js:688:9
at mern-stack-example/mern/server/node_modules/mongodb/lib/mongo_client.js:257:23
at connectCallback (mern-stack-example/mern/server/node_modules/mongodb/lib/operations/connect.js:365:5)
at mern-stack-example/mern/server/node_modules/mongodb/lib/operations/connect.js:552:14
at connectHandler (mern-stack-example/mern/server/node_modules/mongodb/lib/core/sdam/topology.js:286:11)
at cb (mern-stack-example/mern/server/node_modules/mongodb/lib/core/sdam/topology.js:684:18)
at mern-stack-example/mern/server/node_modules/mongodb/lib/cmap/connection_pool.js:348:13
at mern-stack-example/mern/server/node_modules/mongodb/lib/core/sdam/server.js:282:16
at Object.callback (mern-stack-example/mern/server/node_modules/mongodb/lib/cmap/connection_pool.js:345:7)