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