how to create fack json api for testing code example

Example 1: json dummy data

fetch('https://jsonplaceholder.typicode.com/todos')
  .then(response => response.json())
  .then(json => console.log(json))

Example 2: dummy api json

var xhr = new XMLHttpRequest();
xhr.open("GET", "https://reqres.in/api/products/3", true);
xhr.onload = function(){
    console.log(xhr.responseText);
};
xhr.send();