Node.js type error first argument must be a string or buffer

Question

I have written a small code in node.js to insert a document in MongoDB collection. But as I make a request for profile route I get the error I mentioned in the title. I can't figure out which line is causing the problem, maybe it is the one after insertOne method. The code is:

http
  .createServer((req, res) => {

    res.writeHead(200, { "Content-Type": "text/html" });
    var url = req.url;

    if (url == "/") {
      res.end("<h1>Basic route</h1>");
    } else if (url == "/profile") {

      mydb
        .collection("record")
        .insertOne({ username: "vipul", password: "vipul1234" }, (err, result) => {
          if (err) res.end(err);
          else res.end("inserted successfully");
        });
    } else if (url == "/about") {
      res.end("<h1>About Us Page</h1>");
    } else {
      let date = Date();
      res.end("<h1>Incorrect URL</h1><h2>", date, "</h2>");
    }
  })
  .listen(3000, () => {
    console.log("Server listening at port 3000");
  });

Please guide me through. I am a beginner to Node!

res.end doesn't take objects. so res.end(err); might fail. Try res.end(err.message); — tbking
– tbking, Commented Aug 3, 2019 at 17:45
Also don't think that res.end() will accept comma-delimited parameters... — Patrick Roberts
– Patrick Roberts, Commented Aug 4, 2019 at 0:24

MarvinJWendt · Accepted Answer · 2019-08-03 17:50:04Z

1

About this:

if (err)
    res.end(err);
else
    res.end("inserted successfully");

res.end does not accept the error itself. You have to pass it a string or a buffer.

_{(See more here: https://nodejs.org/api/http.html#http_response_end_data_encoding_callback)}

You can try this:

if (err)
    res.end(err.message);
else
    res.end("inserted successfully");

answered Aug 3, 2019 at 17:50

MarvinJWendt

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1 Comment

user11519775 Over a year ago

I have corrected that and it has worked but now it is giving MongoError there are no users authenticated

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