Can't seem to POST using Python and Node.js - javascript

I've looked at various posts on this topic but am still running into an error with this.
Python code:
import requests
import json
url = 'http://127.0.0.1:8080/ay'
payload = {'some': 'data'}
r = requests.post(url, data=payload)
print r.text
print r.status_code
Node.js code:
var app = express();
app.use(bodyparser.urlencoded({
extended: true
}));
app.use(bodyparser.json());
app.post('/ay', function(req, res){
console.log(req.body);
res.send('done');
});
So I've looked at my req and even req.body but req.body returns undefined so I think it's with json=payload but I've also tried params=payload and data=json.dumps(payload)
Edit: I forgot to include bodyparser and urlencoded. I edited my code to show the changes.

You have to use body-parser to get JSON from request body
var bodyparser = require('body-parser');
app.use(bodyparser.json());

Related

NodeJS - Express can't read application/json data

I'm trying to setup a NodeJS express JSON REST API for the first time, but I'm facing some troubles while trying to retrieve the JSON data coming from the requests (both GET and POST requests)
Here's the code:
var bodyParser = require("body-parser");
const express = require("express");
const app = express();
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
extended: true
}));
app.get("/prova", (req, res)=>{
console.log(req.headers["content-type"]);
console.log(req.body);
res.status(200).json(req.body);
});
Here's the console.log();
When trying to make a request with Postman with some parameters:
application/json
{}
And here are the Postman request's details
You should avoid sending body with HTTP GET methods as per MDN web docs. As for the shown GET method this line res.status(200).json(req.body); is giving you an empty object, change it for example to res.status(200).json({message:"Hello world!"}); to see the message. For the POST method you can access the body as you do with req.body.

Express: PayloadTooLargeError: request entity too large

I'm getting this error when I try to send a Base64 string in a POST request.
POST /saveImage 413 10.564 ms - 1459
PayloadTooLargeError: request entity too large
Already tried
--> app.use(bodyParser.urlencoded({ limit: "50mb", extended: true, parameterLimit: 50000 }))
--> app.use(bodyParser.urlencoded({limit: '50mb'}));
--> app.use(bodyParser({limit: '50mb'}));
Here's my code (api.js class)
const express = require('express');
var app = express();
const router = express.Router();
var Connection = require('tedious').Connection
var Request = require('tedious').Request
var TYPES = require('tedious').TYPES
var multer = require('multer');
....
....
....
router.post('/saveImage', (req, res) => {
request=new Request('SAVE_IMAGE',(err, rowCount, rows)=>{
if(err){
console.log(err);
}
});
request.addParameter("Base64Image", TYPES.Text, req.body.IMG)
connection.callProcedure(request);
});
API CALL (Image class contains a Base64 format image and other fields, but I guess the problem occurs because of the Base64 string length. Small images don't cause any trouble)
create(image: Image) {
return this._http.post('/saveImage', image)
.map(data => data.json()).toPromise()
}
I was having the same error. I tried what you tried it did not work.
I guess you are uploading a file. The simple way to solve this is to not set a Content-Type.
my problem was that I was setting on my headers: Content-Type: application/json and I am [was] using multer (expressjs middle for uploading files).
I have the error whenever I try uploading a file.
So when using postman or making such requests using any tools or libraries like axiosjs or fetch() API do not set content-type.
Once you remove the Content-type it will work. That is what I did
on my code, I have:
const express = require('express');
...
const app = express();
app.use(express.json());
...
...And it is working because I removed Content-Type on my postman headers.
Make sure you are not using Content-Type on the headers.
I would recommend you to use express instead of body-parser, as body-parser got merged back in express a long ago.
I am using this code and it seems to work fine, setting the limit option to 200mb, of both express.json and express.urlencoded
app.use(express.json({ limit: "200mb" }));
app.use(express.urlencoded({ extended: true, limit: "200mb" }));
Source: express.json vs bodyparser.json

Nodejs app throws cannot POST /users with body-parser middleware

Here's my app.js file.
var express = require('express'),
bodyParser = require('body-parser'),
oauthServer = require('oauth2-server'),
oauth_model = require('./app_modules/oauth_model')
const app = express()
app.use(bodyParser.urlencoded({ extended: true }));
var jsonParser = bodyParser.json();
app.oauth = oauthServer({
model: oauth_model, // See below for specification
grants: ['password', 'refresh_token'],
debug: process.env.OAUTH_DEBUG,
accessTokenLifetime: 172800,
refreshTokenLifetime: 172800,
authCodeLifetime: 120,
});
// Oauth endpoint.
app.all('/oauth/token', app.oauth.grant());
// User registration endpoint.
app.post('/users', jsonParser, require('./routes/register.js'));
// Get user details.
app.get('/users', app.oauth.authorise(), require('./routes/users.js'));
app.post('/', app.oauth.authorise(), require('./routes/test.js'));
app.use(app.oauth.errorHandler());
app.listen(3000, function () {
console.log('Mixtra app listening on port 3000!')
})
When I send an invalid json body with POST request to localhost:3000/users the request goes to register.js and the validation code works there.
but strangely when I send valid JSON body, it says "Cannot POST /users" with a 404 Not Found HTTP status code and nothing in terminal log.
Note: I'm using postman to send the api requests.
It would be really great if someone could help me with this.
Thanks,
Joy
I don't see you using the jsonParser
You should use it before sending any json to it
app.use(jsonParser);

Request body is null for POST request in NodeJS

I have the below code. when I make a Post request via Postman I get req.body as undefined.
Post Request is http://localhost:1702/es.
Body:
{
"ip_a":"191.X.X.XX",
"pkts":34
}
and Content-Type:"application/json". I also used application/x-www-form-urlencoded but got the same result.
My app.js is:
var express = require('express');
var es=require('./routes/es');
var app = express();
app.post('/es',es.postesdata);
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
And my file where I am receiving a request body null is:
exports.postesdata=function(req,res){
var body=req.body;
console.log(body);//Getting Undefined here
}
Am I doing something wrong here?
express runs middleware in order try:
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.post('/es',es.postesdata);

How to access the request body when POSTing using Node.js and Express?

I have the following Node.js code:
var express = require('express');
var app = express.createServer(express.logger());
app.use(express.bodyParser());
app.post('/', function(request, response) {
response.write(request.body.user);
response.end();
});
Now if I POST something like:
curl -d user=Someone -H Accept:application/json --url http://localhost:5000
I get Someone as expected. Now, what if I want to get the full request body? I tried doing response.write(request.body) but Node.js throws an exception saying "first argument must be a string or Buffer" then goes to an "infinite loop" with an exception that says "Can't set headers after they are sent."; this also true even if I did var reqBody = request.body; and then writing response.write(reqBody).
What's the issue here?
Also, can I just get the raw request without using express.bodyParser()?
Starting from express v4.16 there is no need to require any additional modules, just use the built-in JSON middleware:
app.use(express.json())
Like this:
const express = require('express')
app.use(express.json()) // <==== parse request body as JSON
app.listen(8080)
app.post('/test', (req, res) => {
res.json({requestBody: req.body}) // <==== req.body will be a parsed JSON object
})
Note - body-parser, on which this depends, is already included with express.
Also don't forget to send the header Content-Type: application/json
Express 4.0 and above:
$ npm install --save body-parser
And then in your node app:
const bodyParser = require('body-parser');
app.use(bodyParser);
Express 3.0 and below:
Try passing this in your cURL call:
--header "Content-Type: application/json"
and making sure your data is in JSON format:
{"user":"someone"}
Also, you can use console.dir in your node.js code to see the data inside the object as in the following example:
var express = require('express');
var app = express.createServer();
app.use(express.bodyParser());
app.post('/', function(req, res){
console.dir(req.body);
res.send("test");
});
app.listen(3000);
This other question might also help: How to receive JSON in express node.js POST request?
If you don't want to use the bodyParser check out this other question: https://stackoverflow.com/a/9920700/446681
As of Express 4, the following code appears to do the trick.
Note that you'll need to install body-parser using npm.
var express = require('express');
var bodyParser = require('body-parser');
var app = express();
app.use(bodyParser.urlencoded({ extended: false }));
app.listen(8888);
app.post('/update', function(req, res) {
console.log(req.body); // the posted data
});
For 2019, you don't need to install body-parser.
You can use:
var express = require('express');
var app = express();
app.use(express.json())
app.use(express.urlencoded({extended: true}))
app.listen(8888);
app.post('/update', function(req, res) {
console.log(req.body); // the posted data
});
You should not use body-parser it is deprecated. Try this instead
const express = require('express')
const app = express()
app.use(express.json()) //Notice express.json middleware
The app.use() function is used to mount the specified middleware function(s) at the path which is being specified. It is mostly used to set up middleware for your application.
Now to access the body just do the following
app.post('/', (req, res) => {
console.log(req.body)
})
var express = require('express');
var bodyParser = require('body-parser');
var app = express();
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json())
var port = 9000;
app.post('/post/data', function(req, res) {
console.log('receiving data...');
console.log('body is ',req.body);
res.send(req.body);
});
// start the server
app.listen(port);
console.log('Server started! At http://localhost:' + port);
This will help you. I assume you are sending body in json.
This can be achieved without body-parser dependency as well, listen to request:data and request:end and return the response on end of request, refer below code sample. ref:https://nodejs.org/en/docs/guides/anatomy-of-an-http-transaction/#request-body
var express = require('express');
var app = express.createServer(express.logger());
app.post('/', function(request, response) {
// push the data to body
var body = [];
request.on('data', (chunk) => {
body.push(chunk);
}).on('end', () => {
// on end of data, perform necessary action
body = Buffer.concat(body).toString();
response.write(request.body.user);
response.end();
});
});
In my case, I was missing to set the header:
"Content-Type: application/json"
Try this:
response.write(JSON.stringify(request.body));
That will take the object which bodyParser has created for you and turn it back into a string and write it to the response. If you want the exact request body (with the same whitespace, etc), you will need data and end listeners attached to the request before and build up the string chunk by chunk as you can see in the json parsing source code from connect.
The accepted answer only works for a body that is compatible with the JSON format. In general, the body can be accessed using
app.use(
Express.raw({
inflate: true,
limit: '50mb',
type: () => true, // this matches all content types
})
);
like posted here. The req.body has a Buffer type and can be converted into the desired format.
For example into a string via:
let body = req.body.toString()
Or into JSON via:
let body = req.body.toJSON();
If you're lazy enough to read chunks of post data.
you could simply paste below lines
to read json.
Below is for TypeScript similar can be done for JS as well.
app.ts
import bodyParser from "body-parser";
// support application/json type post data
this.app.use(bodyParser.json());
// support application/x-www-form-urlencoded post data
this.app.use(bodyParser.urlencoded({ extended: false }));
In one of your any controller which receives POST call use as shown below
userController.ts
public async POSTUser(_req: Request, _res: Response) {
try {
const onRecord = <UserModel>_req.body;
/* Your business logic */
_res.status(201).send("User Created");
}
else{
_res.status(500).send("Server error");
}
};
_req.body should be parsing you json data into your TS Model.
I'm absolutely new to JS and ES, but what seems to work for me is just this:
JSON.stringify(req.body)
Let me know if there's anything wrong with it!
Install Body Parser by below command
$ npm install --save body-parser
Configure Body Parser
const bodyParser = require('body-parser');
app.use(bodyParser);
app.use(bodyParser.json()); //Make sure u have added this line
app.use(bodyParser.urlencoded({ extended: false }));
What you claim to have "tried doing" is exactly what you wrote in the code that works "as expected" when you invoke it with curl.
The error you're getting doesn't appear to be related to any of the code you've shown us.
If you want to get the raw request, set handlers on request for the data and end events (and, of course, remove any invocations of express.bodyParser()). Note that the data events will occur in chunks, and that unless you set an encoding for the data event those chunks will be buffers, not strings.
You use the following code to log post data:
router.post("/users",function(req,res){
res.send(JSON.stringify(req.body, null, 4));
});

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