[Solved] SyntaxError: Unexpected token o in JSON at position 1 NodeJS

SyntaxError: Unexpected token o in JSON at position 1 NodeJS, I am getting this error when I use JSON.parse function to decode the JSON from the request in NodeJS, 

SyntaxError: Unexpected token o in JSON at position 1
 at JSON.parse (<anonymous>)
 at C:\nodejs\learning\test.js:6:28
 at Layer.handle [as handle_request] (C:\nodejs\learning\node_modules\express\lib\router\layer.js:95:5)
 at next (C:\nodejs\learning\node_modules\express\lib\router\route.js:137:13)
 at Route.dispatch (C:\nodejs\learning\node_modules\express\lib\router\route.js:112:3)
 at Layer.handle [as handle_request] (C:\nodejs\learning\node_modules\express\lib\router\layer.js:95:5)
 at C:\nodejs\learning\node_modules\express\lib\router\index.js:281:22
 at Function.process_params (C:\nodejs\learning\node_modules\express\lib\router\index.js:335:12)
 at next (C:\nodejs\learning\node_modules\express\lib\router\index.js:275:10)
 at expressInit (C:\nodejs\learning\node_modules\express\lib\middleware\init.js:40:5)

the code is 

const express = require('express');
const app = express();

app.post('/test', (req, res) => {
 res.status(200);
 res.send('Done '+ JSON.parse(req).body.firstName + ' ' + JSON.parse(req).body.lastName);
});

app.listen(3000, () => {
 console.log('Check your brwoser test');
});

Please help 

UPDATE 

I figured it out after a lot of searching I found out that I shouldn't use JSON.parse to decode the JSON data with Express JS so the right way is 

adding this line in the code

app.use(express.json()) 

so the code should look like 

const express = require('express');
const app = express();

app.use(express.json()) // Add this line

app.post('/test', (req, res) => {
 res.status(200);
 res.send('Done '+ req.body.firstName + ' ' + req.body.lastName);
});

app.listen(3000, () => {
 console.log('Check your brwoser test');
});