JS Practice — Built-in Objects

toJSON() — ends with "Z"

📖 Usage Example

const d = new Date('2024-01-15T00:00:00.000Z')
d.toJSON()  // → '2024-01-15T00:00:00.000Z'
JSON.stringify({ date: d })  // uses toJSON()

Use toJSON() to get the ISO 8601 UTC string representation of a Date; it is called automatically by JSON.stringify.

Date.prototype.toJSON()

Like toISOString(), the result always ends with "Z" to indicate UTC.

Challenge: Verify that new Date(0).toJSON().endsWith('Z') is true.

💡 Hints (1)