req.body not appearing in postman.

//app.js

const port =  process.env.PORT || 3000;
const express = require ('express');
const app = express();
const jsonParser = require('body-parser').json;
const routes = require('./routes/routes.js');


app.use(jsonParser());

app.use("/questions", routes);


























app.listen(port,(err)=>{
    if (!err)
            {console.log(`The express server is running at http://localhost:${port}`)}
});

//routes.js
const express = require('express');
const router = express.Router();

//GET /questions
//return all the questions from the db
router.get('/', function(req, res){
    res.json({response: "You sent me a get request"}); 
});

//POST /questions
//Route for creating questions
router.post("/", function(req, res){
    res.json({
        response: "you sent me a POST request",
        body: req.body

    });
});













module.exports = router;

//The error is as following
SyntaxError: Unexpected token c in JSON at position 3
    at JSON.parse (<anonymous>)
    at parse (C:\Restful\node_modules\body-parser\lib\types\json.js:89:19)
    at C:\Restful\node_modules\body-parser\lib\read.js:121:18
    at invokeCallback (C:\Restful\node_modules\raw-body\index.js:224:16)
    at done (C:\Restful\node_modules\raw-body\index.js:213:7)
    at IncomingMessage.onEnd (C:\Restful\node_modules\raw-body\index.js:273:7)
    at emitNone (events.js:106:13)
    at IncomingMessage.emit (events.js:208:7)
    at endReadableNT (_stream_readable.js:1064:12)
    at _combinedTickCallback (internal/process/next_tick.js:138:11)