How to convert object to string in frisby?

[SumanaRameshBaswan]

I am using axios to make http requests, I have a form data to be sent which i am passing as shown below

function addrequestData (token) {
const form = new FormData();
form.append('dateOfJoining', '360112000');
form.append('selectedGroups', JSON.stringify([1])); // [1] data has to be sent in a JSON format
form.append('jobLocation', '1' );

const httpHeaders = form.getHeaders();
httpHeaders.Authorization =  token;
const httpObj = {
    headers: httpHeaders,
    url:     '/admin/hr/addEmployeeBasicInfo',
    data:    form
};
const id = requestData(httpObj, false);

return id.then(({ userInfo }) => {
    return userInfo['createdUserId'];
});

}
My question is How do I make sure that [1] gets converted to string in frisby?

[H1Gdev]

@SumanaRameshBaswan

I don't know how to use frisby in above code...

If you use Promise chain, it looks like the following code.

const frisby = require('frisby');

function addrequestData (token) {
  return frisby.get(url)
    .then(res => {
      const form = new FormData();
      form.append('dateOfJoining', '360112000');
      form.append('selectedGroups', JSON.stringify(res.body)); // Received using frisby.
      form.append('jobLocation', '1' );

      const httpHeaders = form.getHeaders();
      httpHeaders.Authorization = token;
      const httpObj = {
        headers: httpHeaders,
        url:     '/admin/hr/addEmployeeBasicInfo',
        data:    form
      };
      return requestData(httpObj, false); // maybe returns Promise.
    })
    .then(({ userInfo }) => {
      return userInfo['createdUserId'];
    });
}