This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Avoid using it and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

Set the runtime-wide check-object-access callback. This function is deprecated. In SpiderMonkey 1.8.1 and later, use JS_SetRuntimeSecurityCallbacks instead.


JSCheckAccessOp JS_SetCheckObjectAccessCallback(
    JSRuntime *rt, JSCheckAccessOp acb);
Name Type Description
rt JSRuntime * The runtime to configure.
acb JSCheckAccessOp The new check-object-access callback.


JS_SetCheckObjectAccessCallback sets the runtime-wide check-object-access callback, which is used as the fallback JSClass.checkAccess method for all classes that leave the checkAccess field NULL. This callback is also used to check access to the caller property of function objects (as, for example, when the JavaScript engine creates a stack trace) and to check access from scripts to properties with scripted getters or setters.

JS_SetCheckObjectAccessCallback returns the previous check-object-access callback.

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Contributors to this page: fscholz, Jorend
Last updated by: fscholz,