JSON Methods

5.11JSONMethods/t.js

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+let student = {
+    name: 'John',
+    age: 30,
+    isAdmin: false,
+    courses: ['html', 'css', 'js'],
+    spouse: null
+}
+
+let json = JSON.stringify(student);
+
+console.log(typeof json);
+console.log(json)
+
+console.log("JSON.stringify to convert objects into JSON")
+console.log(`JSON.stringfy supports following data types:
+- Objects { ... }
+- Arrays [ ... ]
+- Primitives:
+    - strings
+    - numbers
+    - boolean values true/false
+    - null
+`);
+
+console.log(`JSON.stringfy will skip:
+- Function properties (methods)
+- Symbolic properties
+- Properties that store undefined`);
+
+console.log(`object.toJSON() method can be used to customize the JSON.stringfy behavior`);
+let room ={
+    number: 23,
+toJSON(){
+        return this.number;
+    }
+};
+let meeting = {
+    title: "Conference",
+    room
+};
+console.log(JSON.stringify(meeting));
+
+console.log("JSON.parse to convert JSON back into an object");
+console.log("JSON.parse(str, [reviver]) - reviver is a function(key, value) that will be called for each (key, value) pair and can transform the value");
+console.log("value is the value before transformation");
+console.log("for a date, we can use the following reviver");
+
+let user = {
+    name: "John",
+    age: 35
+};
+
+let userJSON = JSON.stringify(user);
+console.log(userJSON);
+let user2 = JSON.parse(userJSON);
+console.log(user2);