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JS
JavaScript error

TypeError

The JavaScript exception "can't delete non-configurable array element" occurs when it was attempted to shorten the length of an array, but one of the array's elements is non-configurable.

Reference entryJavaScriptFetched
This is a reference entry from MDN Web Docs. A full explanation with fixes has not been written yet.

The error messages

TypeError: Cannot delete property '1' of [object Array] (V8-based)
As listed by MDN Web Docs
TypeError: can't delete non-configurable array element (Firefox)
As listed by MDN Web Docs
TypeError: Unable to delete property. (Safari)
As listed by MDN Web Docs

Details

Category
TypeError
Severity
error
Runtime
both

Related errors

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Source: MDN Web Docs. Data fetched 2026-09-25T01:48:37.274Z.