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How to update JSON file programmatically?

Hi all,

I have this very simple JSON file, but how can I programmatically update it?

When I added the Content Blocker Extenstion the “ConentBlocker” folder was created, which contains the JSON file
I currently have no code, but I want to be able to update the JSON file with a url that is typed in a textfield in my app (not created yet)

This is the JSON file

        "action": {
            "type": "block"
        "trigger": {
            "url-filter": "reddit.com"


read up on how to read and write on files programmatically
you might need to work on how you format the writing though as it will not automatically make it a JSON

Thanks for the reply, i will try to check it out