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JavaScript Build a Simple Dynamic Site with Node.js Handling Routes in Node.js Populating User Information

Jason Berteotti
Jason Berteotti
12,352 Points

events.js:85 is throwing an unhandled 'error' event after displaying a profile's info on the page.

after i place /chalkers or any profile url, the JSON is received and the information is displayed correctly, but the node stops running and displays this error:

events.js:85
throw er; // Unhandled 'error' event
^
Error: write after end
at ServerResponse.OutgoingMessage.write (_http_outgoing.js:413:15)
at Profile.<anonymous> (/home/treehouse/workspace/router.js:40:16)
at Profile.emit (events.js:107:17)
at IncomingMessage.<anonymous> (/home/treehouse/workspace/profile.js:38:36)
at IncomingMessage.emit (events.js:129:20)
at _stream_readable.js:908:16
at process._tickCallback (node.js:355:11)

https://teamtreehouse.com/workspaces/11848292#

Jason Berteotti
Jason Berteotti
12,352 Points

https://w.trhou.se/2wtm9olgng

So, after trying it out several more times, I have found that sometimes it runs fine and displays the badges and continues running, and other times throws the above error. This occurs only on valid usernames; errors work perfectly.

Interestingly I was unable to reproduce the error at all. Made about 30 calls to the node server and none gave the error.

I'm getting the same error, on occasion.

4 Answers

The link to your work space seems to be dead so if you can fix that I can take a look or just paste in your code for your router.

You normally get that error when you try to write a response back after you respond with end.

Check around line 40, your last line in your http request 'on end' function should be something like:

response.end()

I think the thing is to actually move the response.end from the bottom of the user function, not just copy it. This is what throws the error.

Brendan Whiting
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Brendan Whiting
Front End Web Development Techdegree Graduate 84,738 Points

I had the same problem, and I'm glad this thread exists!! Just to add one more thing - you got this error by doing something that you were told to do. We were instructed to put that write statement in there as part of proving a point about how things after response.end won't get written. If we had been looking at his console, we probably would have seen the same error, and it would have been nice to have a heads up about this error message.

Darryn Smith
Darryn Smith
32,043 Points

I am still getting this error (events.js:85) after changing all of my response.end statements. They no longer include anything in quotes. The "Jim has 2 badges" message displays and the server quits with the error mentioned in the OP.

I have no response.write() statements after the response.end() statement.

What's up with this?

First, here is the error log:

treehouse:~/workspace$ node app.js
Server running at http://<workspace-url>/
events.js:85
throw er; // Unhandled 'error' event
^
Error: write after end
at ServerResponse.OutgoingMessage.write (_http_outgoing.js:413:15)
at Profile.<anonymous> (/home/treehouse/workspace/router.js:39:13)
at Profile.emit (events.js:107:17)
at IncomingMessage.<anonymous> (/home/treehouse/workspace/profile.js:38:36)
at IncomingMessage.emit (events.js:129:20)
at _stream_readable.js:908:16
at process._tickCallback (node.js:355:11)
treehouse:~/workspace$

And here is my current router.js code:

var Profile = require("./profile.js");

// Handle HTTP route GET / and POST / i.e. Home
function home(request,response) {
  //if url == "/" && GET
    if(request.url === "/") {
    //show search
          response.writeHead(200, {'Content-Type': 'text/plain'});
            response.write("Header1\n");
            response.write("Search1\n");
            response.end();
}
  //if url == "/" && POST
    //redirect to /:username
}

// Handle HTTP route GET /:username i.e. /darrynsmith
function user(request, response) {
  //if url == "/...."
    var username = request.url.replace("/", "");
    if(username.length > 0) {
        response.writeHead(200, {'Content-Type': 'text/plain'});
        response.write("Header2\n");

        //get json from Treehouse
        var studentProfile = new Profile(username);
    //on "end"
        studentProfile.on("end", function(profileJSON){
        //show profile  

            //Store the values which we need 
            var values = {
                avatarUrl: profileJSON.gravatar_url,
                username: profileJSON.profile_name,
                badges: profileJSON.badges.length,
                javascriptPoints: profileJSON.points.JavaScript
            }
            //Simple response
            response.write(values.username + " has " + values.badges + " badges\n");
            response.end();
        });

    //on "error"
        studentProfile.on("error", function(error){
            //show error
            response.write(error.message + "\n");
            response.end();
        });

    }
}

module.exports.home = home;
module.exports.user = user;

PS: the https 'require' and code fixes have been properly implemented in profile.js:

var EventEmitter = require("events").EventEmitter;
var http = require("http");
var https = require("https");
var util = require("util");

//******************* skip *******************

    var request = https.get("https://teamtreehouse.com/" + username + ".json", function(response) {
        var body = "";

        if (response.statusCode !== 200) {
            request.abort();
            //Status Code Error
            profileEmitter.emit("error", new Error("There was an error getting the profile for " + username + ". (" + http.STATUS_CODES[response.statusCode] + ")"));
        }
gabriel ferreira
gabriel ferreira
3,110 Points

if anyone has the same problem:

make sure that you dont had any "response.write" before the "response.writeHead"