Dapatkan panjang array JSON

let index = 0;
                     destination.addEventListener("click", function(){
                            destination.innerHTML = `<div>
                                                    <h3>Planet ${json[index].name}</h3>
                                                    <img src=${json[index].image} height=250></img>
                                                    </div>`;
                        index = (index+1)% json.length;
                    }); 
Grieving Grouse