Loading lesson path
'{"name":"John", "age":30, "car":null}'Inside the JSON string there is a JSON object literal:
{"name":"John", "age":30, "car":null}
JSON object literals are surrounded by curly braces {}.Formula
JSON object literals contains key/value pairs.Keys and values are separated by a colon. Keys must be strings, and values must be a valid JSON data type: string number object array boolean null
Formula
Each key/value pair is separated by a comma.It is a common mistake to call a JSON object literal "a JSON object". JSON cannot be an object. JSON is a string format. The data is only JSON when it is in a string format. When it is converted to a JavaScript variable, it becomes a JavaScript object.
You can create a JavaScript object from a JSON object literal:
Example myObj = {"name":"John", "age":30, "car":null}; Normally, you create a JavaScript object by parsing a JSON string:
Example myJSON = '{"name":"John", "age":30, "car":null}';
myObj = JSON.parse(myJSON);You can access object values by using dot (.) notation:
const myJSON = '{"name":"John", "age":30, "car":null}';
const myObj = JSON.parse(myJSON);
x = myObj.name;
You can also access object values by using bracket ([]) notation:const myJSON = '{"name":"John", "age":30, "car":null}';
const myObj = JSON.parse(myJSON);
x = myObj["name"];Formula
You can loop through object properties with a for - in loop:const myJSON = '{"name":"John", "age":30, "car":null}';
const myObj = JSON.parse(myJSON);
let text = "";
for (const x in myObj) {
text += x + ", ";
}Formula
In a for - in loop, use the bracket notation to access the property valuesconst myJSON = '{"name":"John", "age":30, "car":null}';
const myObj = JSON.parse(myJSON);
let text = "";
for (const x in myObj) {
text += myObj[x] + ", ";
}