How to write json data to a google sheet using javascript

I'm trying to render json data to a google sheet using javascript.

I have tried searching through loads of documentation and I've been trying for hours. I do get one line of data come into my sheet but I need to render the whole json dataset in the correct rows and columns

function renderJSON() {
  /* This function collects JSON data from a specified endpoint
  and renders the data to a spreadsheet */

  // Fetch JSON data from the endpoint
  var url = 'http://dummy.restapiexample.com/api/v1/employees';
  var response = UrlFetchApp.fetch(url);     // Get the JSON data
  var object = JSON.parse(response.getContentText());
  //Logger.log(response);

  // Define an array of all object keys
  var rows = []; // Declare an empty array
  rows.push(object);
  var headerRow = Object.keys(rows);

  // Define an array of all object values
  var rows = headerRow.map(function(key){return rows [key]});

  // Define the contents of the range
  var contents = [
    headerRow,
    rows
    ];

  // Select the range and set its values
  var ss = SpreadsheetApp.getActive();
  var rng = ss.getActiveSheet().getRange(1, 1, contents.length, 
  headerRow.length)
  var i;
  for (i = contents[0]; i < contents.length; i++) {
    rng.setValues([i]);
  }
}

I expect the whole of the json data to be in perfect format for a google sheet with the correct heading and everything aligned in the correct columns. Currently there is no output to the sheet.