I just want to extract an http-Post but I didn't get it working. Can somebody help me please? The request is made by my HTML Frontend using XMLHttpRequest() and the backend is node.js. When I send the request I only get an empty Object {}
Node Backend
var express = require('express');
const bodyParser = require('body-parser');
var app = express();
app.use(express.json());
app.post('/save_options', (req, res) => {
console.log(req.body);
res.sendStatus(200);
});
Frontend
let DATA_FRONTEND_OPTIONS = {
"test":"1"
}
function save_options_to_database() {
var do_it_async = true;
var request = new XMLHttpRequest();
request.onload = function () {
var status = request.status;
var data = request.responseText;
}
request.open("POST", "/save_options", do_it_async);
request.setRequestHeader("Content-Type", "application/json;charset=UTF-8");
//request.setRequestHeader("Content-Type", "text/plain;charset=UTF-8");
request.send(JSON.stringify(DATA_FRONTEND_OPTIONS));
}
Simply add
app.use(express.urlencoded());
to your express configuration.
Here is great explanation:
https://stackoverflow.com/a/51844327/8522881
You have to add express.json() and express.urlencoded() for POST request.
Example:
app.use(express.json());
app.use(express.urlencoded());
Because in POST request the data which is sending is in form of some type of data object and you have to tell the server to accept or store that type of data (object), which is enclosed in the body of your POST request.
Above the same solution applied for PUT requests also.
Related
Here's my request:
var xhttp = new XMLHttpRequest();
xhttp.open("GET", "/api/registerRequest?user=user", true);
xhttp.send();
And here's the request being handled:
var express = require("express");
var router = express.Router();
router.get("/registerRequest/:user", function(req, res, next){
console.log("response for param");
console.log(req.params.user);
});
router.get("/registerRequest", function(req, res, next){
console.log("normal response");
console.log();
});
And here's the app:
var express = require("express");
var app = express();
app.use("/api", index);
Note that these are just small, relevant to the question, portions of the code.
Now, the output in the console is
normal response
But from my understanding, it should be:
response for param
user
You're misunderstanding routing.
router.get("/registerRequest/:user" matches URLs of the form /registerRequest/..., where ... becomes req.params.user.
You aren't making such a URL.
In the url /api/registerRequest?user=user, you are sending user as a query parameter. Which will allow you to access it from req.query.user. more here
In order to access it from req.params.user, you'll need to change the url in the ajax request to /api/registerRequest/user. doc reference
i want to send some json data from my client page to server page of node.js,
here i have my server page :
var express = require('express');
var bodyParser = require('body-parser');
var app = express();
app.use(bodyParser.json());
app.post('/', function(req,res){
res.send('recieved request');
console.log(req.body);
});
app.listen(8081);
console.log('listening on 8081');
client page:
var name ='someName';
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function(){
if(this.readyState== 4 && this.status == 200){
console.log(this.responseText);
}
};
xhttp.setRequestHeader({'Content-Type': 'application/json'});
xhttp.open('POST', 'http://localhost:8081', true);
xhttp.send(JSON.stringify({'name' : name}));
I got the result as a null json {}.
NOTE: I don't want to about submission of a form , i just want to send JSON data from html file to node.js file.
The correct signature for a call to XMLHTTPRequest#setRequestHeader is setRequestHeader(header, value);
Change
xhttp.setRequestHeader({'Content-Type': 'application/json'});
to
xhttp.setRequestHeader('Content-Type', 'application/json');
Docs: https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/setRequestHeader
I am currently working with the Express platform, the Twilio Node.js SMS API and obviously javascript to send text messages to my users. Problem is, I don't know what I should do in order to send data through my GET variables on the front-end and capture those values with node.js on the back-end.
For testing purposes, I created a simple button that sends a text message to a fixed number when clicked.
Here is the javascript side:
function sms() {
xmlhttp = new XMLHttpRequest();
xmlhttp.open("GET","http://localhost:5001", true);
xmlhttp.onreadystatechange=function(){
if (xmlhttp.readyState==4 && xmlhttp.status==200){
alert(xmlhttp.responseText);
}
}
xmlhttp.send();
}
Here is the node.js side:
var accountSid = 'ACCOUNT_SID';
var authToken = 'ACCOUNT_TOKEN';
//require the Twilio module and create a REST client
var client = require('twilio')(accountSid, authToken);
var express = require("express");
var app = express();
app.get('/',function(request,response){
var to = "TO";
var from = "FROM";
client.messages.create({
to: to,
from: from,
body: 'Another message from Twilio!',
}, function (err, message) {
console.log("message sent");
});
});
app.listen(5001);
I have came across two ways to send a responseText from Node.js, but can't manage to make them work
first one using response.send("Hello World"); or the second one response.write("Hello again"); response.end();
So just to sum it up, I want to send variables (to, from, message, etc.) through my http request, capture them in node.js and send a responseText! As a heads up, I'm very comfortable with AJAX requests between JS and PHP, but Node.js is new to me.
Thanks in advance
I think the new Guides will help you out here with How to receive and reply to SMS in Node.js:
https://www.twilio.com/docs/guides/sms/how-to-receive-and-reply-in-node-js
The CodeRail along the right hand side will walk you through it step-by-step but you should pay attention particularly to the section titled "Generate a dynamic TwiML Message".
var http = require('http'),
express = require('express'),
twilio = require('twilio'),
bodyParser = require('body-parser');
var app = express();
app.use(bodyParser.urlencoded({ extended: true }));
app.post('/', function(req, res) {
var twilio = require('twilio');
var twiml = new twilio.TwimlResponse();
if (req.body.Body == 'hello') {
twiml.message('Hi!');
} else if(req.body.Body == 'bye') {
twiml.message('Goodbye');
} else {
twiml.message('No Body param match, Twilio sends this in the request to your server.');
}
res.writeHead(200, {'Content-Type': 'text/xml'});
res.end(twiml.toString());
});
http.createServer(app).listen(1337, function () {
console.log("Express server listening on port 1337");
});
Is it possible to POST data from a client javascript page to a node server (server.js) using an AJAX XMLHttpRequest()? What I am looking for is javascript code that will receive the data on the node server, specifically the values for member_nm ("newName") and member_email ("mail#google.com"). I control the server. I also understand that I can also use GET to send the text values by means of a querystring. Below is the request that is sent from the client javascript page by means of an event handler:
document.getElementById("btnAddMember").addEventListener("click", function()
{
var request = new XMLHttpRequest();
var path = "/Users/Admin/WebstormProjects/projectName/server.js";
request.onreadystatechange = function()
{
if ( request.readyState === 4 && request.status == 200 )
{
request.setRequestHeader("Content-Type", "text/plain; charset=UTF-8");
request.open("POST", path, true);
request.send("member_nm=newName&member_email=mail#google.com");
}
};
});
You need to setup your server to accept this post request, the easiest will be to use Express with bodyParser middleware, like this :
var express = require('express');
var server=express();
var bodyParser= require('body-parser');
server.use(bodyParser.json());
server.post('/', function(req, res){
if(req.body){
// get the params from req.body.paramName
}
});
server.listen(8222, function(){
console.log('listening for requests ..')
});
In your client code change the 'path' to point to the server url:port, and I will put these outside of the onReadyStateChange:
request.setRequestHeader("Content-Type", "text/plain; charset=UTF-8");
request.open("POST", path, true);
request.send("member_nm=newName&member_email=mail#google.com");
This is a working solution on how to POST variables from a client javascript file to a Node server using Express. The POST is initiated on the client by means of an event handler, btnAddMember. txtName.value and txtMembershipType.value contain the values to be posted. Note the syntax that is necessary to parse the values correctly. member_nm and member_type will be used to reference the properties on the Node server. First the client javascript:
document.getElementById("btnAddMember").addEventListener("click", function()
{
var request = new XMLHttpRequest();
var path = "http://0.0.0.0:0000"; // enter your server ip and port number
request.open("POST", path, true); // true = asynchronous
request.setRequestHeader("Content-Type", "application/json; charset=UTF-8");
var text= '{"member_nm":"' + txtName.value + '","member_type":"' + txtMembershipType.value + '"}';
request.send ( text );
});
Next is the server side code. Note that bodyParser must now be added to your project as a node_module. This can be done through the node program manager (npm). The POST statement basically parses the req.body from a JSON format to a javascript object format using a variable called 'member'. The code then logs the posted values for the two variables, member_nm and member_type. Finally a response status is sent to the client if the POST is successful.
var bodyParser = require("body-parser");
...
app.use(bodyParser.text({ type: "application/json" }));
...
// receive the POST from the client javascript file
app.post("/", function (req, res)
{
if (req.body)
{
var member = JSON.parse( req.body ); // parse req.body as an object
console.log("member_nm: " + member.member_nm );
console.log("member_type: " + member.member_type );
res.sendStatus(200); // success status
}
else
{
res.sendStatus(400); // error status
}
});
I'm trying to send a JSON object from javaScript to node.js server. I'm using a standard XMLHttpRequest to send it from javascript and a standard node.js code.
Two codes seem to be communicating normally however the node.js always gives me an empty JSON object. I'm not really sure what am I doing wrong.
This is my javascript code:
<html>
<head>
<script>
function xhrPost() {
var data = {"name":"John", "time":"2pm"};
var xhr = new XMLHttpRequest();
xhr.withCredentials = true;
xhr.addEventListener("readystatechange", function () {
if (this.readyState === 4) {
console.log(this.responseText);
}
});
xhr.open("POST", "http://[serverIP]:8080/addUser");
xhr.setRequestHeader("cache-control", "no-cache");
xhr.setRequestHeader("content-type", "application/json;charset=UTF-8");
xhr.send(JSON.stringify(data));
}
</script>
</head>
<body onload="xhrPost()">
</body>
</html>
and this is my node.js code:
var express = require("express");
var myParser = require("body-parser");
var app = express();
app.use(myParser.urlencoded({extended : true}));
app.post("/addUser", function(request, response) {
console.log(request.body); // this line allways produce {}
response.send("Message received.");
response.end();
});
app.listen(8080);
You have to use myParser.json() as a middleware. See more about it in https://github.com/expressjs/body-parser#bodyparserjsonoptions
After following line:
var myParser = require("body-parser");
You should add on more line as:
var myParser = require("body-parser");
app.use(myParser.json());// parse application/json
This was the most helpful stackoverflow page to solve my problem as well.
I was trying to get form fields, formulate them into a JSON on the client, then send to the server to use the fields for a MySQL call to a separate database.
Object {name: "", reps: "1", weight: "1", date: "", lbs: "0"}
I was able to get the object logging correctly on the client, yet every time I tried to send the data to the server,
console.log(req.body);
Would always return on the server as either
{}
undefined
Server side my setup with functioning data passing is
var express = require('express');
var mysql = require('./dbcon.js');
var app = express();
var handlebars = require('express-handlebars').create({defaultLayout:'main'});
var request = require('request');
var myParser = require("body-parser");
var async = require('async');
app.set('view engine', 'handlebars');
app.set('port', Number(process.env.PORT || 3000));
app.use(myParser.json());
app.use(express.static('public'));
app.engine('handlebars', handlebars.engine);
On my client side js file, I have a function upon form submit that does:
var data = {
"name":document.getElementById("fname").value,
"reps":document.getElementById("freps").value,
"weight":document.getElementById("fweight").value,
"date":document.getElementById("fdate").value,
"lbs":bool
};
...
req.open("POST", "/insert", true);
req.setRequestHeader("content-type", "application/json;charset=UTF-8");
...
req.send(JSON.stringify(data));