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console.log(a[a.length - 1]['objectId']);
Diese Antwort benötigt Informationen zum Analysieren des JSON. Beachten Sie, dass das OP auf die JSON-Ausgabe verwiesen hat und erwähnt die Möglichkeit, RegEx zu verwenden, um auf die gewünschten Bits zuzugreifen. – JAAulde
das funktionierte, aber ich musste es zuerst analysieren. –