Json and web api

I’m making a barcode scanner app in which when I scan the item, the nutrition grade (A, B, C, D, E) for that specific food item should appear on the user’s screen. I’m having trouble with the json component of this project.

This is the web api link I’m using: https://world.openfoodfacts.org/api/v0/nutrition_score/737628064502.json

This is what I have so far:

Please don’t start a new topic for the same issue.

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