TrustedHTML: toJSON() method

Baseline 2026

Newly available

Since February 2026, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

Note: This feature is available in Web Workers.

The toJSON() method of the TrustedHTML interface returns a JSON representation of the stored data.

Syntax

toJSON()

Parameters

None.

Return value

A string containing a JSON representation of the stored data.

Examples

The constant escaped is an object created via the Trusted Types policy escapeHTMLPolicy. The toString() method returns a string to safely insert into a document.

js
const escapeHTMLPolicy = trustedTypes.createPolicy("myEscapePolicy", {
  createHTML: (string) => string.replace(/</g, "&lt;"),
});

const escaped = escapeHTMLPolicy.createHTML("<img src=x onerror=alert(1)>");
console.log(escaped.toJSON());