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How to get POST parameters via node.js

I a m kinda stuck. I made a request to a server. I want the server to computer a operation for me, and send me back the result.
Request :
ar http = require('http');
http.createServer(function(req, res){
var response = "Hello from " + req.client.remoteAddress + ":" + req.client.remotePort + "\n to " + req.client.localAddress + ":" + req.client.localPort;
console.log(response);
var XMLHttpRequest = require("xmlhttprequest").XMLHttpRequest;
const Http = new XMLHttpRequest();
console.log("start");
n = 15;
const urlfibo='http://172.22.0.4:8899';
Http.open("POST", urlfibo,false);
var params = 'value=15';
Http.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
Http.send(params);
console.log(Http.responseText);
response += Http.responseText;
res.writeHead(200, {'Content-Type': 'text/plain'});
res.write(response);
res.end();
On my server, i don't know where to find the parameter i passed. I've tryed the solution in the doc, but my code is never running into it :
```
response += "\n ON" + req.on
let body = [];
req.on('data', (chunk) => {
response += "bla"
body.push(chunk);
}).on('end', () => {
body = Buffer.concat(body).toString();
// at this point, `body` has the entire request body stored in it as a string
});
My question is : on y server (second part of code), how do i get my params i passed when i sent the request ? I want to do it with nodejs without using frameworks
Thank you

chunk will have all informations because is an object, you just have to assign this values for a new object and look for the parameters. Bug make sure to have in your code:
const bodyParser = require('body-parser');
app.use(bodyParser);

node.js redirection not working to add username

I am working on a Team Treehouse project that builds a dynamic website with Node.js. The user enters in a username into the search field and it displays the user's avatar, number of badges earned and the number of JavaScript points. For some reason when I enter in the user name and click search the page just goes blank. I think there might be something wrong with the 303 redirection in my router.js file. I'm still fairly new to coding so any insight would be very helpful. Here are each of my js files.
/*****app.js file******/
var router = require('./router.js');
//Problem: We need a simple way to look at a user's badge count and JavaScript points from a web browser
//Solution: Use Node.js to perform the profile look ups and serve our templates via HTTP
//Create a web server
var http = require('http');
http.createServer(function (request, response) {
router.home(request, response);
router.user(request, response);
}).listen(3000);
console.log('Server running at http://<workspace-url>');
/*****router.js file******/
var Profile = require("./profile.js");
var renderer = require('./renderer');
var querystring = require('querystring');
var commonHeader = {'Content-Type': 'text/html'};
// Handle the HTTP route GET / and POST / i.e. Home
function home(request, response) {
//if url == "/" && GET
if (request.url === '/'){
if (request.method.toLowerCase() === "get") {
//show search
console.log(request.url);
response.writeHead(200, commonHeader);
renderer.view('header', {}, response);
renderer.view('search', {}, response);
renderer.view('footer', {}, response);
response.end();
}
else {
//if url == "/" && POST
//get the post data from body
request.on('data', function(postBody){
//extract the username
var query = querystring.parse(postBody.toString());
//redirect to /:username
response.writeHead(303, {'Location': '/' + query.username });
response.end();
});
}
}
}
// Handle the HTTP route for GET /:username i.e. /chalkers
function user(request, response) {
//if url == "/...."
var username = request.url.replace('/', '');
if(user.name.length > 0){
response.writeHead(200, commonHeader);
renderer.view('header', {}, response);
//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
renderer.view('profile', values, response);
renderer.view('footer', {}, response);
response.end();
});
//on "error"
studentProfile.on("error", function(error){
//show error
renderer.view('error', {errorMessage: error.message}, response);
renderer.view('search', {}, response);
renderer.view('footer', {}, response);
response.end();
});
}
}
module.exports.home = home;
module.exports.user = user;
/*****profile.js file*******/
var EventEmitter = require("events").EventEmitter;
var http = require("http");
var util = require("util");
/**
* An EventEmitter to get a Treehouse students profile.
* #param username
* #constructor
*/
function Profile(username) {
EventEmitter.call(this);
profileEmitter = this;
//Connect to the API URL (http://teamtreehouse.com/username.json)
var request = http.get("http://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] + ")"));
}
//Read the data
response.on('data', function (chunk) {
body += chunk;
profileEmitter.emit("data", chunk);
});
response.on('end', function () {
if(response.statusCode === 200) {
try {
//Parse the data
var profile = JSON.parse(body);
profileEmitter.emit("end", profile);
} catch (error) {
profileEmitter.emit("error", error);
}
}
}).on("error", function(error){
profileEmitter.emit("error", error);
});
});
}
util.inherits( Profile, EventEmitter );
module.exports = Profile;
/*****renderer.js file*******/
var fs = require('fs');
function mergeValues(values, content) {
//Cycle over the keys
for(var key in values) {
//Replace all the {{key}} with the value from the values object
content = content.replace('{{' + key + '}}', values[key]);
}
//return merged content
return content;
}
function view(templateName, values, response) {
//Read from the template file
var fileContents = fs.readFileSync('./views/' + templateName + '.html', {encoding: 'utf8'});
//Insert values in to the content
fileContents = mergeValues(values, fileContents);
//Write out the contents to the response
response.write(fileContents);
}
module.exports.view = view;

Treehouse changed from http to https and so this example code doesn't work any longer. The reason for that is in the profile.js file. You are making calls for an http site and it doesn't exist. You need to change the code (only in profile.js) to make it connect to the https site instead.
var http = require("http");
should be changed to
var https = require("https");
and with that all references to the variable in your profile.js code should be changed to https.
As well as the hard-coded URL start:
var request = http.get("http://teamtreehous...
should be
var request = https.get("https://teamtreehous...
That should resolve the problem. Good luck!

In order to get your code in the profile.js file to run, you need to change some instances of the "http" module to "https" but, and this is important, not all instances.
What needs to remain http is the the status code error on the profile.js page. This line of code is correct:
profileEmitter.emit("error", new Error("There was an error getting the profile for " + username + ". (" + http.STATUS_CODES[response.statusCode] + ")"));
But all other instances of the http module need to change to https. For example, these lines are correct:
var url = "https://teamtreehouse.com/" + username + ".json";
var request = https.get(url, function(response){
Remember to require both modules at the top of profile.js page
var http = require("http");
var https = require("https");

How can i make a response.write in the request module

I'm creating HTTP server and inside i'm sending a request to to yahoo finance website and getting some data from it, what i want to do is to print to browser the data i got from yahoo finance.
the thing is that response.write isn't working inside the request.
Here is my code:
var http = require('http');
var request = require('request');
var cheerio = require('cheerio');
var util = require('util');
var host = "127.0.0.1";
var port = 1400;
var server = http.createServer(function (req, res) {
//writing the headers of our response
res.writeHead(200, {'Content-Type':'text/plain'});
// Variable Deceleration
// TODO: move from the global scope
var ticker = "IBM";
var yUrl = "http://finance.yahoo.com/q/ks?s=" + ticker;
var keyStr = new Array();
//
// The main call to fetch the data, parse it and work on it.
//
request(yUrl, function (error, response, body) {
if (!error && response.statusCode == 200) {
var $ = cheerio.load(body);
// the keys - We get them from a certain class attribute
var span = $('.time_rtq_ticker>span');
stockValue = $(span).text();
res.write("trying to print something");
console.log("Stock - " + ticker + " --> text " + stockValue );
}
}); // -- end of request --
res.write('Welcome to StockWach\n');
//printing out back to the client the last line
res.end('end of demo');
});
server.listen(port, host, function () {
console.log("Listening : " + host +":" + port);
});

You have to end the response (res.end();). Almost all browsers buffer some number of bytes from the response before showing anything, so you won't see the trying to print something until the response has ended.
If you use something like cURL though, you will see the trying to print something right away before the response is ended.

Node.js request data event not firing. What am I doing wrong?

It seems like the data event on the request object is not firing, or I can't wire it up right in order to get anything from it. I am getting the end event just fine, and all the urls are working. I have looked on forums and documentation, and when I look at my code it seems like it should work. I am using Node version 0.10.12.
I am new. I am trying to get a simple server going in node. I was following The Node Beginner Book. Most of this code comes from there, with some very small modifications. I have already tried the code straight from the book.
Here is the code I am working with now.
index.js
var server = require("./server");
var router = require("./router");
var requestHandlers = require("./requestHandlers");
var handle = {};
handle["/"] = requestHandlers.start;
handle["/start"] = requestHandlers.start;
handle["/upload"] = requestHandlers.upload;
if (process.argv[2] !== undefined && process.argv[2] !== null) {
server.start(router.route, handle, process.argv[2]);
} else {
server.start(router.route, handle);
}
router.js
route = function(handle, pathname, response, postData) {
if (typeof handle[pathname] === "function") {
handle[pathname](response, postData);
} else {
response.writeHead(404, {"Content-Type": "text/plain"});
response.end("404 Not found");
}
}
exports.route = route;
server.js
var http = require('http');
var url = require('url');
var portToUse = 8888;
start = function(route, handle, port) {
if (port !== undefined && port !== null && typeof parseInt(port) === 'number' && port > 1000 && port < 10000) {
console.log('You passed in the port number %d.', port);
portToUse = port;
}
http.createServer(function(request, response) {
var postData = '';
var pathname = url.parse(request.url).pathname;
console.log('Request for %s received.', pathname);
route(handle, pathname, response);
request.setEncoding('utf8');
// I have tried both .on and .addListener
request.on('data', function(postDataChunk) {
postData += postDataChunk;
console.log('Received POST data chunk %s.', postData);
});
request.on('end', function(postDataChunk) {
console.log(postDataChunk);
route(handle, pathname, response, postData);
});
}).listen(portToUse);
console.log('The server listening on %d.', portToUse);
}
exports.start = start;
requestHandlers.js
var exec = require('child_process').exec;
start = function(response, postData) {
var body = '<!doctype html>' +
'<html lang="en">' +
'<head>' +
'<meta charset="UTF-8">' +
'<title>Upload Server</title>' +
'</head>' +
'<body>' +
'<form action="/upload">' +
'<textarea name="text" id="text-area" cols="40" rows="20"></textarea>' +
'<input type="submit" value="Submit text">' +
'</form>' +
'</body>' +
'</html>';
response.writeHead(200, {"Content-Type": "text/html"});
response.end(body);
}
upload = function(response, postData) {
response.writeHead(200, {'Content-Type': 'text/plain'});
response.end('You\'ve sent: ' + postData);
}
exports.start = start;
exports.upload = upload;
Thanks in advance.

You need to add your data listener before you call route. Reason being, in your handlers you are calling response.end. When you do this, node checks if there are any data listeners on the socket, and if not, it will dump the existing request data, as it figures it's no longer needed.

How get string pathname?

How get string pathname ?
var http=require('http');
var url = require("url");
http.createServer(function(req,res){
var pathname = url.parse(req.url).pathname;
console.log("Request for " + pathname + " received.");
res.writeHead(200,{'Content-Type':'text/plain'});
res.end('Hello\n');
}).listen(8124,'127.0.0.1');
console.log('Server me!');
There is no error output,but not displayed Request for ....

This seems to work for me:
FL261:~ jvah$ node pathname
Server me!
Request for / received.
And at the same time in the other window using curl:
FL261:~ jvah$ curl http://127.0.0.1:8124/
Hello