[[PromiseState]]: "rejected" [[PromiseResult]]: SyntaxError: Unexpected token < in JSON at position 0 code example

Example: get promise result from json() javascript

// Full request
fetch(myRequest)
  .then(response => response.json())
  .then(data => {
      console.log(data);
});
  
// Function that returns response
myFunction().then(data => {
  	console.log(data);
});