Creating issues with JIRA API returns issuetype error with node js

[Lukas Fink]

I try to create an issue via API and node js on my JIRA board. Therefore, I created a Postman project and this works perfectly fine - but when transferring it to my node js script I get follwoing error:

{ errorMessages: [],
  errors: { issuetype: 'issue type is required' } }

I'm using cookie-based auth.

Here's my request code (it's totally the same then in my Postman project - I just don't see why it won't work):

var options = { 
  method: 'POST',
  url: 'https://jira.anyurl.com/rest/api/latest/issue/',
  headers: { 
    'cache-control': 'no-cache',
    'content-type': 'application/json',
    cookie: 'anycookievalue' 
  },
  body: { 
    fields: { 
      project: { 
        key: 'PP' 
      },
      issuetype: { 
        name: 'New Feature'
      },
      summary: 'Foo Bar',
      description: 'Hello World'
    }
  },
  json: true 
};

request(options, function (error, response, body) {
  if (error) throw new Error(error);
  console.log(body);
});

Anyone discovered the same thing and can help?