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

Posted by Sorin Chircu
Sorin Chircu
45,432 Points

ERR_STREAM_WRITE_AFTER_END when hosting locally.

So, I got to the end of this video, and when I run the server it works, when I open the page it works, when I put the profile to an invalid one it works, but if it's a valid profile, I get the following error:

Server running at http:127.0.0.1:1337
events.js:167
      throw er; // Unhandled 'error' event
      ^

Error [ERR_STREAM_WRITE_AFTER_END]: write after end
    at write_ (_http_outgoing.js:572:17)
    at ServerResponse.write (_http_outgoing.js:567:10)
    at Profile.<anonymous> (D:\Documents\scripts\Build a Simple Dynamic Site with Node.JS\stage_1_video_3\router.js:38:22)
    at Profile.emit (events.js:182:13)
    at IncomingMessage.<anonymous> (D:\Documents\scripts\Build a Simple Dynamic Site with Node.JS\stage_1_video_3\profile.js:38:36)
    at IncomingMessage.emit (events.js:187:15)
    at endReadableNT (_stream_readable.js:1094:12)
    at process._tickCallback (internal/process/next_tick.js:63:19)
Emitted 'error' event at:
    at writeAfterEndNT (_http_outgoing.js:634:7)
    at process._tickCallback (internal/process/next_tick.js:63:19)

The code of my router.js is the same as in the video, I even tried copying and pasting the entire "finished" version of the code into my code to make sure I had zero typing mistakes. The app.js is also the same, excepting the port number I'm using and the text that gets output by the console.log command.

var router = require("./router.js");
// Problem: Simple way to look at user's badget count and JS points from browser
// Solution: Use node.js to performe profile lookups and server our template via HTTP

//1. Create a web server
var http = require('http');
http.createServer(function (request, response){
    router.home(request, response);
    router.user(request, response);
}).listen(1337);
console.log('Server running at http:127.0.0.1:1337');

//2. Function that handles reading of files and merge in values
    //Read from file and get string
        //merge values into string

var Profile = require("./profile.js");
//1. 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("Header\n"); 
        response.write("Search\n"); 
        response.end("Footer\n"); 
    }
        //response.end('Hello world!\n');
    //if url === "/" && POST
        //redirect to username
}
//2. Handle HTTP route GET /:username i.e /chalkers
function user(request, response){
    //if URL == "/...."
    var username = request.url.replace("/", "");
    if(username.length > 0){
        response.writeHead(200, {'Content-Type': 'text/plain'});
        response.write("Header\n");

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

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

        });            
    }
}

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

Honestly, I have no clue what could be causing this. Any guesses?

3 Answers

Adam Beer
Adam Beer
11,314 Points
Adam Beer
Adam Beer
11,314 Points

Interesting issue. Because I tried your code and it works fine to me. I saw you use the server, but maybe this is the bug. Stop the server, then restart. What happend?

Sorin Chircu
Sorin Chircu
45,432 Points

I tried that, yeah, even uninstalled Node.js v10 and installed v8 under recommendation from someone and it still crashes. I am so confused.

Matt Davis
Matt Davis
13,372 Points
Matt Davis
Matt Davis
13,372 Points

I'm getting the same error did you ever figure this out?

JASON LEE
JASON LEE
17,352 Points
JASON LEE
JASON LEE
17,352 Points

It works fine on my end. All I did was change the server to the local host. But it shouldn't have changed anything relating to the error message. 

var http = require('http');
http.createServer(function (request, response){
    router.home(request, response);
    router.user(request, response);
}).listen(3000, '127.0.0.1', "");
console.log('Server running at http://127.0.0.1:3000');