Postman send strange response for raw JSON post (node js)

Question

I'm trying to do a POST request using raw json.

In the Body tab I have "raw" selected with this body:

{
"name": "book"
}

On the Node js side I'm doing res.send(JSON.stringify(req.body))

router.post('/', (req, res, next) => {
  res.send(JSON.stringify(req.body));
}

And in POSTMAN response I receive:

{"{\n\"name\": \"book\"\n}":""}

When expected something like

{"name":"book"}

Have no idea - where could be a reason for it?

Terry Lennox Terry Lennox · Accepted Answer · 2019-09-23T12:45:55

You'll need to use the Express JSON body parser, install using

npm install body-parser;

Then:

const bodyParser = require('body-parser');
app.use(bodyParser.json());

Once you do this, the JSON data will be parsed correctly and when you send it back it will render correctly.

Also make sure you have your Content-Type header set to "application/json" in your Postman request (go to "Headers" and add a new "Content-Type" header with value "application/json")

Here's a simple express app that will echo any JSON POST:

const express = require("express");
const port = 3000;
const app = express();
const bodyParser = require('body-parser')

app.use(bodyParser.json());

app.post('/', (req, res, next) => {
    console.log("Body: ", req.body);
    res.send(JSON.stringify(req.body));
})

app.listen(port);
console.log(`Serving at http://localhost:${port}`);

Postman send strange response for raw JSON post (node js)

4 Answers