How do you convert a JavaScript object to JSON?

JSON.stringify() serialises a JavaScript object into a JSON string ready to send or store.

let person = {
    name: "Muster",
    vorname: "Hans",
    address: "Musterstr. 23"
};

let personJSON = JSON.stringify(person);
console.log(personJSON);
// {"name":"Muster","vorname":"Hans","address":"Musterstr. 23"}

Common use cases:

• Sending data to an API
• Storing data in localStorage
• Logging objects for debugging

Pretty printing:

// 2-space indentation
JSON.stringify(person, null, 2);

Note: JSON.stringify() skips undefined values, functions, and symbols.