Express js - request body is empty - javascript

I just installed the latest versions of modules. I can not get any GET or POST variables. What i do wrong?
NODE: v0.12.2
var express = require("express");
var bodyParser = require("body-parser");
var app = express();
app.use(bodyParser.urlencoded({ extended: false }))
// parse application/json
app.use(bodyParser.json())
app.use(function (req, res) {
res.setHeader('Content-Type', 'text/plain')
res.write('you posted:\n')
res.end(JSON.stringify(req.body, null, 2))
});
app.listen(3000,function(){
console.log("Started on PORT 3000");
})
http://localhost:3000/?token=devvvvv GET returns:
you posted:
{}
Thanks for answers, but problem with POST does not solved...
POST token=as123ds on http://localhost:3000/ return empty array in req.body
How can i solve this?

You are submitting parameters via the query string and attempting to access them through the request body which in this case is empty.
The token parameter will be available in request.query like so:
app.use(function (req, res) {
res.setHeader('Content-Type', 'text/plain')
res.write('you posted:\n')
res.end(JSON.stringify(req.query.token, null, 2))
});
If you only plan to submit parameters in the query string you should not need to mount the body-parser middleware at all.

You should be using the req.query:
req.query
An object containing a property for each query string parameter in the route. If there is no query string, it is the empty object, {}.
api link

You are parsing JSON from the request, so the POST from client must have 'Content-Type': 'application/json' in HTTP header. If not, you'll have empty request.body at server side.

bodyparser module requires the http request's "Content-type" property equal to "application/json". It won't work for other values.

You have to check the request content type in the client, this link may help
Node (Express) request body empty
This is because bodyParser parses application/json,
application/x-www-form-encoded and multipart/form-data, and it selects
which parser to use based on the Content-Type.

Related

Express request body return null

I have a problem with express POST request,
const express = require('express')
const app = express()
app.use(express.json())
app.use(express.urlencoded({extended: true}))
app.post('/movie/add', (req, res) => {
console.log(req.body) // {}
//
})
can someone tell me, why after sending some data like:
{
"msg":"Hello"
}
then my req.body return me {}? He should return me an object of my msg value but instead of I have an empty array :/
thanks for any help!
You need to do two things if you want to use the request body.
1.in request header include Content-type application/json
2.in code Use middleware to parse into json. app.use(express.json());
Note use ​app.use(express.json()) before route declartion.
view example here
Bydefault body is undefined
app.use(express.json()); help you to defined the data
while content-type application/json allow you to pass json.if you did not include content-type application/json request.body will return define empty object { }.
I think you should use body-parser
http://expressjs.com/en/resources/middleware/body-parser.html

How Do I Get Body From Get Request In Express?

My Code Returns Invalid Text When I Try To Do It.
app.post("/charge", (req, res) => {
console.log(req.body)
})
As the doc for req.body says:
req.body contains key-value pairs of data submitted in the request body. By default, it is undefined, and is populated when you use body-parsing middleware such as express.json() or express.urlencoded().
The following example shows how to use body-parsing middleware to populate req.body.
By default, the body of the request is not yet read from the incoming stream and therefore it is not yet parsed into req.body either. To get it read and parsed into req.body, you have to use some appropriate middleware that will do that for you (or you could do it manually yourself, but it's generally easier to use pre-written middleware that does the job for you).
Which middleware to use depends upon the type of the data in the body (urlEncoded data, JSON data or something else).
Here's the example from the doc:
var express = require('express')
var app = express()
app.use(express.json()) // for parsing application/json
app.use(express.urlencoded({ extended: true })) // for parsing application/x-www-form-urlencoded
app.post('/profile', function (req, res, next) {
console.log(req.body)
res.json(req.body)
})

Node.js unable to read POST JSON data in my webhook

I have a node.js + Express application. It has a webhook that I have provided to a third party service. The service sends a POST request to my webhook with JSON body which looks something like this:
{"split_info" : "null", "customerName" : "Merchant Name",
"additionalCharges" : "null", "paymentMode":"CC",
"hash":"a31ff1b91fd9b8ae9c82f38b02348d21fsdfd86cc828ac9a0acf82050996372cc656de3db0fe3bf9af52b73a182a77787241f3e19ec893391607301b03e70db8",
"status" : "Release Payment", "paymentId" : "551731" ,
"productInfo":"productInfo", "customerEmail":"test#gmail.com",
"customerPhone":"9876543212", "merchantTransactionId":"jnn",
"amount":"100.0", "udf2":"null", "notificationId" :"4", "udf1":"null",
"udf5":"null", "udf4":"null", "udf3":"null","error_Message":"No
Error"}
I am using body-parser module to read POST data. However when I do req.body it gives [object Object], if I do JSON.stringify(req.body), it gives {} i.e. empty. If I try to access the keys in the response like req.body.paymentMode then it gives undefined.
Here is my router code for the webhook: mywebhook.js
var express = require('express');
var router = express.Router();
router.post('/success', function(req, res){
//this is where I need to strip the JSON request
//req.body or JSON.stringify(req.body) or anything that works
//if everything is okay then I send
res.sendStatus(200);
});
module.exports = router;
My app.js looks like this:
var express = require('express');
var exphbs = require('express-handlebars');
var router = express.Router();
var bodyParser = require('body-parser');
var mywebhook = require('./routes/mywebhook');
var app = express();
.
.
.
app.use(bodyParser.urlencoded({'extended':'true'})); // parse application/x-www-form-urlencoded
app.use(bodyParser.json()); // parse application/json
app.use(bodyParser.json({ type: 'application/vnd.api+json' })); // parse application/vnd.api+json as json
app.use('/callwebhook', mywebhook);
.
.
.
so on
Pretty sure I am missing something or doing something wrong, but I am not able to figure it out.
Thanks.
I finally found what was going on.
The way the body-parser works is that it will only try to parse a request in which they understand the Content-Type. This is mainly so you can stack them (app.use multiple parser types without conflict) and also because you typically don't want to parse a request that's going to fail (Content-Type: text/html is unlikely to ever get through a JSON.parse, for example).
I ended up getting sent */*; charset=UTF-8 which is not even a valid Content-Type header value period. The body-parser module refused to accept it, since that is gibberish. This module does allow you to setup a function that lets you put any custom logic you want to perform the filtering.
I had to put the body parser in my router code just for this webhook case.
var bodyParser = require('body-parser');
var customParser = bodyParser.json({type: function(req) {
return req.headers['content-type'] === '*/*; charset=UTF-8';
}});
router.post('/success', customParser, function(req, res){
console.log(JSON.stringify(req.body));
});
#svens thank you for your help.

I can't get data from req.body in nodesjs + expressjs

This is my code:
var express = require("express");
var bodyParser = require("body-parser");
var app = express();
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
app.get('/',function(req,res){
res.sendfile("index.html");
});
app.post('/login',function(req,res){
console.log(req.body)
var user_name=req.body.user;
var password=req.body.password;
console.log("User name = "+user_name+", password is "+password);
res.end("yes");
});
app.listen(3000,function(){
console.log("Started on PORT 3000");
})
I set a console in post method function but it displayed:
{}
User name = undefined, password is undefined
I couldn't get any data from response. I had lookup doc but I couldn't find any error. I don't still understand. What mistake did i make?
You should send your data using Postman with the content-type:application/json in the header. This will ensure that the server receives the data in JSON format.
I know what happens!
If I want to send data in form-data, here has good solution helps me:
Result is undefined when I use form-data in Postman
If I use x-www-form-urlencoded to send data, it's actually valid!
I find when postman send json data without content-type:application/json in headers, it's definitely error. Now, I have added it. It can be valid.
Thanks, everyone!

POST parameters in ExpressJS

I am working on a simple texteditor that saves and loads text files through an Node/ExpressJS server. Loading is fine, but saving doesn't work yet due to me not being able to transmit the data to the server-app correctly.
I send the data via XMLHttpRequest to the server in a POST request, which works fine according to the network-profiler in dev-tools, the 'handler_save' function is called, but no parameters are received.
What am I doing wrong? (here is a snippet of the server code, altered for demonstration:)
express = require('express')();
function init_save_load(){
var bodyParser = require('body-parser');
express.use(bodyParser.urlencoded({ extended: true }));
express.use('/save', handler_save );
express.use('/load', handler_load );
}
...
function handler_save(req, res){
console.log(req.body); // "{name:post.txt,data:testing}"
}
make sure you are parsing the request body so it can work
var bodyParser = require('body-parser');
app.use(bodyParser());
bodyParser is a part of "Connect", a set of middlewares for node.js. Here's the real docs and source from Connect: http://www.senchalabs.org/connect/bodyParser.html
finally console log the req.body and see what is in there
console.log(req.body)
Not only do you need to use a body parsing middleware as Abdul mentioned, but your request needs to have the correct Content-Type. Currently you are sending Content-Type: text/plain, but it should be Content-Type: application/x-www-form-urlencoded for simple forms or Content-Type: multipart/form-data for forms containing files.

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