The isScriptURL() method of the TrustedTypePolicyFactory interface returns true if it is passed a valid TrustedScriptURL object.


The purpose of the functions isScriptURL(), isHTML(), and isScript() is to check if the object is a valid TrustedType object, created by a configured policy.


var isScriptURL = TrustedTypePolicyFactory.isScriptURL(value);


A TrustedScriptURL object.

Return value

A booleanthat is true if the object is a valid TrustedScriptURL object.


In the below example the constant url was created by a policy, and therefore isScriptURL() returns true. The second example is an attempt to fake an object, and the third is a string. Both of these will return false when passed to isScriptURL().

const url = policy.createScriptURL('');
console.log(trustedTypes.isScriptURL(url)) // true;

const fake = Object.create(TrustedScriptURL.prototype);
console.log(trustedTypes.isScriptURL(fake)); // false

console.log(trustedTypes.isScriptURL("")); // false


Specification Status Comment
Trusted Types
The definition of 'TrustedTypePolicyFactory.isScriptURL()' in that specification.
Editor's Draft Initial definition.

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