node.js use request make http calls to transfer the correct array format array

Question

for example: to transfer a obj to /localhost/transfer

var request = require('request');
var obj={ 
  tag: 'false',
  array: [ '3', '4', '5'] 
}

request.post({url:/localhost/transfer, form:obj},function(err,httpResponse,body){
            if(err){
                res.json({error:false});
            }else{
                res.json({error:true});
            }
        });

get obj

router.post('/transfer',function(req, res, next){
  console.log(req.obj);

});

the console obj display:

{ tag: 'false',
  'array[0]': '3',
  'array[1]': '4',
  'array[2]': '5' }

How to send or receive data correctly? like this

 { 
      tag: 'false',
      array: [ '3', '4', '5'] 
    }

request: https://github.com/request/request#custom-http-headers

Community · Accepted Answer · 2020-06-20 09:12:55Z

2

The /transfer endpoint receives obj as 'array[0]': '3', 'array[1]': '4', 'array[2]': '5' because the Content-Type of the HTTP request is application/x-www-form-urlencoded -- in the request.post() option, form property is used.

In order to send JSON object to /transfer, the Content-Type should be application/json. In module request, it can be implemented as below:

var request = require('request');

var obj={
  tag: 'false',
  array: [ '3', '4', '5']
};

// requestb.in URL is used here for example, but it can be replaced.
request({
  url: 'https://requestb.in/srp1bmsr',
  method: 'post',
  body: obj,
  json: true
}, function(err, response, body) {
  if(err){
    // deal with error.
  }else{
    // deal with success response.
  }
});

According to module request's document, body and json in the code means:

body - entity body for PATCH, POST and PUT requests. Must be a Buffer, String or ReadStream. If json is true, then body must be a JSON-serializable object.

json - sets body to JSON representation of value and adds Content-type: application/json header. Additionally, parses the response body as JSON.

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Sep 5, 2017 at 7:15

shaochuancs

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2 Comments

Finn Over a year ago

Why does not the document mention this part?

shaochuancs Over a year ago

@AlbertChen Do you mean application/x-www-form-urlencoded? Actually, the request module document mentioned by providing a simple example. Please search "application/x-www-form-urlencoded (URL-Encoded Forms)" in the document page and you will get it.

Sibin · Accepted Answer · 2017-09-05 10:09:35Z

1

You can set headers using the headers property.

request.post({
   url:/localhost/transfer,
   body: obj,
   json: true
},function(err,httpResponse,body){
    if(err){
        res.json({error:false});
    }else{
        res.json({error:true});
    }
});

You can also set json: true, then it will add the header automatically and also parse the response body as JSON.

edited Sep 5, 2017 at 10:09

answered Sep 5, 2017 at 4:09

Sibin

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1 Comment

shaochuancs Over a year ago

@AlbertChen It's not working because form property is used in request.post() and body is missing. Also, please note it is not necessary to define "content-type": "application/json" here as json: true will add it automatically.

Dulaj Atapattu · Accepted Answer · 2017-09-05 02:31:47Z

0

When sending you have to set JSON headers as the content type.

Send

let message = {
    tag: 'false',
    array: [ '3', '4', '5'] 
};

return this.http
      .post(url, message, new Headers({'Content-Type': 'application/json'}))

When receiving you have to use the JSON body parser to parse the req body. https://www.npmjs.com/package/body-parser

Receive

router.post('/signin', function (req, res) {
    console.log(req.bod);           
});

Here I'm using express as my node server. In your app.js (server.js or whatever main script) set the body parser to parse JSON payloads.

const express = require('express');
const bodyParser = require('body-parser');

const app = express();
app.use(bodyParser.json());

answered Sep 5, 2017 at 2:31

Dulaj Atapattu

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3 Comments

Finn Over a year ago

github.com/request/request#custom-http-headers,Forgot to mention that I am using this kit, which seems to have similar functionality, but I do not know how to use

Dulaj Atapattu Over a year ago

It's for client side right? What are you using for server side?

Dulaj Atapattu Over a year ago

Do you redirect the request to another server? Ok. Now what is your problem? Didn't my answer help?

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