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Please try following (taken from [1]): /** * param {Date[]} aliases */ function Test(aliases) { aliases[0]. } and invoke cc after ".". I think in this case IDE could be able to offer Date methods/properties. And the same could be done with @return [1] https://code.google.com/p/jsdoc-toolkit/wiki/TagParam#Parameter_Type_Information Product Version: NetBeans IDE Dev (Build web-main-10218-on-20130402) Java: 1.7.0_17; Java HotSpot(TM) Client VM 23.7-b01 Runtime: Java(TM) SE Runtime Environment 1.7.0_17-b32 System: Linux version 3.2.0-39-generic-pae running on i386; UTF-8; en_US (nb)