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

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!

Related

What's the NodeJS / Express equivalent to PHP's file_get_contents('php://input')?

In PHP I can fetch incoming JSON from let's say an AJAX request by calling file_get_contents('php://input'), I'm now rebuilding my API in NodeJS (TypeScript) and am looking for an equivalent to fetch incoming JSON.
Various web searches did not deliver what I was looing for, so I hope to find help here.
You can try to call the correct URL by using Axios. Following this link https://www.npmjs.com/package/axios for more.
You can use bodyparser for express and receive data via post.
let app = express();
const bodyParser = require("body-parser");
app.listen(port);
console.log('API started port' + port);
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
app.post('/path', "maybe cors()", function(req, res){
let data = req.body.data //data is the json you get
}
Thats the way i fetch json that gets send to the server. Hope you can make something with it.

Showing null output in Node.js when using POSTMAN

I am using POSTMAN to test me API calls with Node.Js.When I am sending POST request from POSTMAN to Node server it is showing null response in console.log().
const express = require('express');
const bodyParser = require('body-parser');
var app = express();
var port = process.env.PORT || 3000;
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended:true}));
router.get('/',(req,res) => {
console.log("Name:" +req.body.name);
res.end();
});
app.listen(port,(req,res) =>{
console.log("Server is running at:" +port);
});
Now, I am sending POSTMAN request at URL = localhost:3000/ and data is
Key: name and Value: John
In console it is showing error like
TypeError: Cannot read property 'name' of undefined
You have defined the request in the express framework as a get:
router.get
and you said you are sending a POST.
Change one thing or the other
You need to change your method to POST like this:
router.post('/',(req,res) => {
console.log("Name:" +req.body.name);
res.end();
});
Also you need to make a post throw POSTMAN with this options :
And you should have your result :

Undefined variable Express Js - Node JS

I want to build an API with node js.
i post the data using postman.
I don't know why, every time I post the data, I got nothing.
Here is my code :
let router = require('express').Router();
let bodyParser = require('body-parser');
let db = require('./queries');
router.use(bodyParser.json());
router.use(bodyParser.urlencoded({ extended: false }));
router.post('/test', function (req, res) {
res.send('post data ' + req.body.clinic_name)
});
req.body.clinic_name has no value, thats why it will undefined data.
i try clinic_name, address, phone, and fax. all of them returning undefined data.
please help me to fix this issue.
thank you.
use the "application/x-www-form-urlencoded" tab in POSTMAN or you can make sure your client has header '"Content-Type: "application/json"', and send a raw json
Problem is that you have sent the data res.send('welcome, ' + req.body.clinic_name) first and then printing in console.log(req.body);
It should be like
console.log(req.body);
res.send('welcome, ' + req.body.clinic_name)

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.

Express js - request body is empty

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.

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