syntax error unexpected token o in json at position 0 code example

Example 1: Uncaught (in promise) SyntaxError: Unexpected token O in JSON at position 0

var stringified = JSON.stringify(data);
var parsedObj = JSON.parse(stringified);
 
console.log(parsedObj);

Example 2: "SyntaxError: Unexpected token o in JSON at position 1

var newData = JSON.stringify(userData)