How to render products on a collection page from my database using Theme App Extensions?

Technical Q&A
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Topic summary

Goal: Build a Shopify app that lets merchants organize products and lets customers choose options, then display a collection page showing only products matching the customer’s selection.

Current approach: Use URL query parameters to filter the collection page based on the customer’s choices.

Key challenge: How to influence an existing collection template (or create a dedicated page) via Theme App Extensions so the page can fetch data from the app’s own database and render the correct products, rather than relying solely on Shopify’s native collection data.

Status: No implementation details or solutions yet. The author is seeking guidance on integrating app-managed product groupings into a collection page. Discussion remains open.

Summarized with AI on January 11. AI used: gpt-5.
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Hi all, I am building an app that let’s merchants organize products in a specific way, and allows customers to select their specific option. Once a customer selects their options I want to render a collection page with the products that apply to the customer’s selection.

The products are organized in my database, and I am trying to use url query parameters to filter out the collection page.

What I am having a hard time understanding is how can I effect an already existing collection template, or create my own page so that there is a collection page that fetches info from my data base and renders out the correct products.

Any help is appreciated, thanks!