battery-level | Get current battery level

i can get the json file content and display the object content but i cannot display json content when the json file has more than 1 object inside.

here is how it looks when i have one object only:

and that how it looks when i have more than 1 object on the database.json

and if you got a solution here is my client js code

I tried to redo the code of the kernel module found in this topic How can I obtain battery level inside a Linux kernel module?. But when I try to use the functions contained in the power_supply.h header file, the loading of the module fails because it does not recognize the power_supply_get_by_name function.

Here is the code that I am using on Ubuntu 18.04 with kernel version 4.15.0-101-generic: