why post json data not receive in node.js?

Question

when i post json data on node server, it leads to error 'Response to preflight request doest't pass access control check' but when i post same request on php server it works . browser console picture

can someone tell me why this not working in node.js but when i tried to post data through postman on node server now no error it works.

postman picture

here is my nodeJS code

const express = require('express');
const app = express();
app.use(express.json());

app.post('/post', function(req, res){
  res.header('Access-Control-Allow-Origin', '*');
  res.send(req.body);
})

and this is request code that is send from browser

function callAjax(){
  jQuery.ajax({
    method: 'POST',
    url:'http://localhost:3010/post',
    "headers": {
        "content-type": "application/json"
    },
    data: {
        email:'[email protected]'
    },
    success: function(data){
        console.log(data);
    },
    error: function(err){
        console.log(err);
    }
   });
 }

Harish Kommuri · Accepted Answer · 2018-05-23 10:00:27Z

3

You have to use body-parser.

var bodyParser = require('body-parser');

app.use(bodyParser.json());

app.use(bodyParser.urlencoded({
   extended: true
}));


app.post('/post', function(req, res){
   res.setHeader('Access-Control-Allow-Origin', '*');

   res.json(req.body);
});

edited May 23, 2018 at 10:00

answered May 23, 2018 at 8:13

Harish Kommuri

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2 Comments

Iftikhar Hussain Over a year ago

still got error 'No 'Access-Control-Allow-Origin' header is present on the requested resource.'

Harish Kommuri Over a year ago

@IftikharHussain, I haven't seen the code before. Use res.setHeader instead of res.header. I have edited answer. Please check it. REF: stackoverflow.com/questions/18310394/…

Sanjay · Accepted Answer · 2018-05-23 08:09:16Z

1

use cors module first:-

npm install --save cors
var cors = require('cors')
app.use(cors())

answered May 23, 2018 at 8:09

Sanjay

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5 Comments

Iftikhar Hussain Over a year ago

not working but now error changes on client side ' Failed to load localhost:3010/post: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'localhost' is therefore not allowed access. The response had HTTP status code 400.'

Sanjay Over a year ago

app.use(cors()) should be placed at top

Iftikhar Hussain Over a year ago

now request sent with no error but return nothing. but when i app.use(express.json()); uncomment it show me 400 bad request

Sanjay Over a year ago

try res.json(req.body) instead res.send(req.body) & if it solves accept my awnser

Sanjay Over a year ago

also use body-parser as someone has suggested in awnser to get (body)

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