When I try to POST the JSON string from the front-end, `req` shows the following properties:
```
 _contentType: 'application/json',
  body: '{"feedback":"galaxy rox my sox","page_url":"/submit"}',
```
and it determines that `typeof fbData` is a string, hence it returns `bad_json_request`. Do we have to do `JSON.parse(fbData)` first?