tunnel-ssh throws an error after getting connected - node.js

Question

I'm trying to connect to mongodb(mongodb package) using the tunnel-ssh package. It gets connected and I can log the db but it immediately throws an error and disconnects.
buffer.js:705
throw new ERR_INVALID_ARG_TYPE(
^
TypeError [ERR_INVALID_ARG_TYPE]: The "string" argument must be one of type string, Buffer, or ArrayBuffer. Received type undefined
at Function.byteLength (buffer.js:705:11)
at SSH2Stream.directTcpip (D:\WORK\node_modules\ssh2-streams\lib\ssh.js:1128:23)
at openChannel (D:\WORK\node_modules\ssh2\lib\client.js:1142:21)
at Client.forwardOut (D:\WORK\node_modules\ssh2\lib\client.js:994:10)
at Client.<anonymous> (D:\WORK\node_modules\tunnel-ssh\index.js:16:23)
at Client.emit (events.js:223:5)
at SSH2Stream.<anonymous> (D:\WORK\node_modules\ssh2\lib\client.js:601:10)
at Object.onceWrapper (events.js:312:28)
at SSH2Stream.emit (events.js:223:5)
at parsePacket (D:\WORK\node_modules\ssh2-streams\lib\ssh.js:3911:10) {
code: 'ERR_INVALID_ARG_TYPE'
}
This is my code.
const tunnel = require("tunnel-ssh");
const config = require("config");
const MongoClient = require("mongodb").MongoClient;
const connection = new Promise((resolve, _) => {
// eslint-disable-next-line
tunnel(config.get("server"), async (err, server) => {
server.on("connection", console.log.bind(console, "server error"));
const client = await MongoClient.connect(config.get("mongodb").url, {
useUnifiedTopology: true,
useNewUrlParser: true
});
client.on("error", console.error.bind(console, "mongodb error"));
resolve({ client });
});
});
async function runQuery() {
const { client} = await connection;
console.log(client);
}
runQuery();
There is no problem with config. In fact, the logging in runQuery function works but throws that error immediately.

Answer 1

I have not used the tunnel-ssh package you have mentioned, but I went through the docs and I see that you are using it wrong. I simply copied the configuration given in the docs of tunnel-ssh and it started working for me. pasting the entire code below
const tunnel = require("tunnel-ssh");
const MongoClient = require("mongodb").MongoClient;
const connection = new Promise((resolve, _) => {
// eslint-disable-next-line
tunnel(
{
username: "root",
Password: "secret",
host: "127.0.0.1",
port: 22,
dstHost: "127.0.0.1",
dstPort: 27017,
localHost: "127.0.0.1",
localPort: 27000
},
async (err, server) => {
server.on("connection", console.log.bind(console, "server error"));
const client = await MongoClient.connect(
"mongodb://localhost:27017/user",
{
useUnifiedTopology: true,
useNewUrlParser: true
}
);
client.on("error", console.error.bind(console, "mongodb error"));
resolve({ client });
server.close();
}
);
});
async function runQuery() {
const { client } = await connection;
console.log("Connection Successful");
}
runQuery();
The part where you went wrong is passing string to tunnel package. it expects configuration object not string.