How do I covert json into variable?

Hello ~ I would like to ask a question about converting json into global variables.
Here is my screen shot of the code. I would like to convert the scene variable “error” into scene variable “data” and print the content of (which should be “cindy”).
But I failed for many times and printed out as “0”.

I’d tried the original Gdevelop function parse but it didn’t work out. So I tried coding as javascript directly. But both of them didn’t work for me.

If any one have any idea please let me know !!! Thank you all very much!!!

Are you using the way told here,Network [GDevelop wiki]

See this working example:

Use the debugger to watch the value of your variables