@naeem For a sensible answer, I need to know more information. Which JSON file is it and what is it for?
JSON file is easy to create, just click "Write to file", for example, with the name "my_file.json". You can find the content (syntax) of JSON here: https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects/JSON
I want to confirm instagram account using BAS and for that i cant leave the URL where i need to enter the code.
To get the code i should open another URL, so how can i open 2 URLs simultaneously so i could enter the code?