JunkBlock

Chrome extension that labels food products on Oda and Mathem as ultra-processed (UPF) or not, based on the NOVA classification system.

What it does

JunkBlock scans product pages and adds badges to each product:

• Ultra (red) — contains ultra-processed ingredients (NOVA Group 4)
• Ikke UPF (grey) — no ultra-processed markers found

Click an Ultra badge to see which specific markers were detected (e.g., emulgator, maltodekstrin, E621).

Supported stores

• Oda (oda.com, oda.no) — Norwegian online grocery
• Mathem (mathem.se) — Swedish online grocery

How it works

1. Extracts ingredient lists via Next.js data routes
2. Scans ingredients against a curated list of NOVA Group 4 markers (Norwegian + Swedish)
3. Checks for UPF indicator substances, cosmetic additives, and non-whitelisted E-numbers
4. Adds badges to product image icon rows on listing pages and detail pages

Works on listing/category pages, search results, and individual product pages including modal views.

Install

Available on the Chrome Web Store.

Or sideload for development:

1. Clone this repo
2. Open chrome://extensions in Chrome
3. Enable "Developer mode" (top right)
4. Click "Load unpacked" and select this folder
5. Browse oda.com/no or mathem.se — badges appear automatically

Settings

Click the JunkBlock icon in your toolbar to open the settings popup:

• Toggle marker categories on/off (e.g., disable sweeteners or E-numbers)
• Add custom markers to flag additional ingredients
• Remove individual markers you disagree with

Settings sync across devices via Chrome storage.

Classification rules

The detection engine uses categorized UPF markers:

• Modified sugars/syrups — glucose-fructose syrup, maltodextrin, dextrose, etc.
• Modified fats — hydrogenated, interesterified fats
• Modified starch
• Protein isolates — soy protein isolate, whey protein, casein, hydrolyzed protein, mechanically separated meat
• Emulsifiers & stabilizers — emulsifiers, stabilizers, thickeners, gelling agents, carrageenan
• Colorings & flavor enhancers — colorants, MSG, flavor enhancers
• Flavorings — aroma/arom (excluding natural flavorings)
• Sweeteners — aspartame, sucralose, acesulfame, sugar alcohols, etc.
• Preservatives — sodium benzoate, potassium sorbate, sodium nitrite, etc.
• E-numbers — any E-number not on the ~40-item whitelist of natural/traditional additives (e.g., E330 citric acid, E322 lecithin, E500 baking soda are whitelisted)

Moderate strictness: traditional ingredients like lecithin, gelatin, and palm oil are NOT flagged.

Privacy

All analysis happens locally in your browser. No data is collected or transmitted anywhere. See privacy policy.

Tech

• Manifest V3, content script + settings popup
• Uses storage permission for user preferences only
• Fetches ingredient data via public Next.js data routes (no API keys)
• Concurrent fetching (8 parallel) with debounced scanning
• Site detection auto-selects correct path prefix (/no/ for Oda, /se/ for Mathem)

Files

manifest.json    — Extension manifest
upf-rules.js     — NOVA Group 4 classification engine + settings
content.js       — DOM scanning, badge insertion, tooltip logic
styles.css       — Badge and tooltip styles
popup.html/js/css — Settings popup UI
icons/           — Extension icons (16, 48, 128px)
privacy-policy.md — Privacy policy

Contact

• Issues: https://github.com/anderskraken/junkblock/issues
• Email: numeric-softy-2t@icloud.com

License

MIT