Answers for ".json() javascript"

object to json javascript

var person={"first_name":"Tony","last_name":"Hawk","age":31};
var personJSONString=JSON.stringify(person);

json javascript

// Storing data:
myObj = {name: "John", age: 31, city: "New York"};
myJSON = JSON.stringify(myObj);
localStorage.setItem("testJSON", myJSON);

// Retrieving data:
text = localStorage.getItem("testJSON");
obj = JSON.parse(text);
document.getElementById("demo").innerHTML = obj.name;

use of .json() in javascript

fetch('http://example.com/movies.json')
  .then(response => response.json())
  .then(data => console.log(data));
//Since the HTTP response is not a JSON Object, 
//.json() extracts the JSON Object from the HTTP response

fetch response json or text

const _fetch = async props => {
   const { endpoint, options } = props
   return await fetch(endpoint, options)
   .then(async res => {
      if (res.ok) {
         return await res.clone().json().catch(() => res.text())
      }
      return false
   })
   .catch(err => {
      console.error("api", "_fetch", "err", err)
      return false
   })
}

json in javascript

var str = '{"names":[' +                    // crate JSON object
'{"first":"Hakuna","lastN":"Matata" },' +
'{"first":"Jane","lastN":"Doe" },' +
'{"first":"Air","last":"Jordan" }]}';
obj = JSON.parse(str);                      // parse
document.write(obj.names[1].first);         // access