I am accessing a key from json object but it returns undefined

```
{"body":"Hi","date":"2016-07-29 07:43:00"}

var a = JSON.parse(JSON.stringify(r.txt));
console.log(a.body)

//undefined

```

value of r is

```
{
  username: '1',
  txt: '{"body":"Hi","date":"2016-07-29 07:43:00"}',
 }

```

I have tried using stringify and then parse to json but still return undefined.