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JavaScript Objects and JSON

April 5, 2026

JavaScript Objects

Key-value collections for structured data.

Object Examples

let person = {
    name: "John",
    age: 25,
    greet() {
        return "Hi, I'm " + this.name;
    }
};

console.log(person.name);      // "John"
console.log(person.greet());   // "Hi, I'm John"

// JSON
let json = JSON.stringify(person);
let obj = JSON.parse(json);

Key Points

Dot notation: person.name, bracket: person["name"].
this refers to current object.
ES6 shorthand: name instead of name: name.
JSON for data interchange.

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