Undefined type error using JS object get value by key variable, and JSON source file(s) inquiry

[boilermaker73]

Has anyone by chance experienced an undefined type error using JS object get value by key variable that requires the square bracket notation? On another note, in contemplating using JSON in an Acroform, is it advisable to download the JSON source code and place any of the JSON files in the Acrobat Javascripts folder and if so which which source files? Thank you ahead of time.   

[Thom Parker]

The "undefined" error just means that a variable (or property) used with object notation is undefined, so the notation makes no sense.

Do not use external JSON source code in Acrobat unless you understand exactly what it is you are doing. 

[boilermaker73]

In response to 'The "undefined" error just means that a variable (or property) used with object notation is undefined, so the notation makes no sense. Understood but I really don't believe you understood the question. In response to 'Do not use external JSON source code in Acrobat unless you understand exactly what it is you are doing', if u r going to be presumptuous with a hint of arrogance in fielding a question, please refrain from answering as your response was certainly not helpful. 

[Thom Parker]

I understand perfectly.  No code was provided so I couldn't point out the exact issue, but my answer is on point. A variable with an undefined value was used with object notation, which resulted in the error. The fix is to test the variable before using it to acquire another value.  This is a very common issue. 

About JSON. The current version of Acrobat DC already contains a JSON object. So there is no reason to include code that defines a JSON object. Because of this, trying to include code that redefines the JSON object could be problematic.  And of course there is no reason to do it.  In your use case the actual JSON format is not important, since it's only used to save and restore data on the document. So the older methods of converting data objects to and from text are suitable for this purpose. Hence my comment about being careful, cause what you are asking about is both risky and unnecessary. 

[Bernd Alheit]

What script does you use?