Temporal.Duration.prototype.toJSON()

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The toJSON() method of Temporal.Duration instances returns a string representing this duration in the same ISO 8601 format as calling toString(). It is intended to be implicitly called by JSON.stringify().

Syntax

js
toJSON()

Parameters

None.

Return value

A string representing the given duration in the ISO 8601 format, with as much subsecond precision as necessary to represent the duration accurately.

Description

The toJSON() method is automatically called by JSON.stringify() when a Temporal.Duration object is stringified. This method is generally intended to, by default, usefully serialize Temporal.Duration objects during JSON serialization, which can then be deserialized using the Temporal.Duration.from() function as the reviver of JSON.parse().

Examples

Using toJSON()

js
const duration = Temporal.Duration.from({ hours: 1, minutes: 30, seconds: 15 });
const durationStr = duration.toJSON(); // 'PT1H30M15S'
const d2 = Temporal.Duration.from(durationStr);

JSON serialization and parsing

This example shows how Temporal.Duration can be serialized as JSON without extra effort, and how to parse it back.

js
const duration = Temporal.Duration.from({ hours: 1, minutes: 30, seconds: 15 });
const jsonStr = JSON.stringify({ data: duration }); // '{"data":"PT1H30M15S"}'
const obj = JSON.parse(jsonStr, (key, value) => {
  if (key === "data") {
    return Temporal.Duration.from(value);
  }
  return value;
});

Specifications

Specification
Temporal proposal
# sec-temporal.duration.prototype.tojson

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
toJSON
Experimental

Legend

Tip: you can click/tap on a cell for more information.

In development. Supported in a pre-release version.
In development. Supported in a pre-release version.
No support
No support
Experimental. Expect behavior to change in the future.
See implementation notes.
User must explicitly enable this feature.

See also