BodyParser Express, I've got Object inside Object - express

Question

I am trying post some data on a server but doesn't work because I am getting something like { '{\n "rate" : "26"\n}': '' }.
----App.js
const express = require('express'),
mongoose = require('mongoose'),
bodyParser = require('body-parser');
const db = mongoose.connect('mongodb://localhost/invoiceAPI');
app = express(),
port = process.env.PORT || 3000,
Rate = require('./models/rateModel'),
Client = require('./models/clientModel'),
Invoice = require('./models/invoiceModel');
app.use(bodyParser.urlencoded({extended: true}));
app.use(bodyParser.json());
const invoiceRouter = require('./routes/invoiceRoutes')(Invoice),
clientRouter = require('./routes/clientRoutes')(Client),
rateRouter = require('./routes/rateRoutes')(Rate);
app.use('/api/invoices', invoiceRouter);
app.use('/api/clients', clientRouter);
app.use('/api/rates', rateRouter);
app.listen(port, () => {
console.log('Gulp is running on port ' + port);
});
---The rateRoutes file:
const express = require('express');
const rateRoutes = (Rate) => {
const rateRouter = express.Router();
rateRouter.route('/')
.get((req,res) => {
Rate.find((err,rates) => {
if(err){
res.status(500).send(err);
}
else res.json(rates);
});
})
.post((req,res) => {
console.log(req.body);
let rate = new Rate(req.body);
rate.save();
res.status(201).send(rate);
});
return rateRouter;
}
module.exports = rateRoutes;
When I execute the post with {"rate": 26} I got
{ '{\n "rate" : "26"\n}': '' }
I read something about the order of bodyParser, but doesn't work.