---
description: Explore demo applications and reference architectures that use D1 databases.
title: Demos and architectures
image: https://developers.cloudflare.com/og-docs.png
---

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> Documentation Index  
> Fetch the complete documentation index at: https://developers.cloudflare.com/d1/llms.txt  
> Use this file to discover all available pages before exploring further.

# Demos and architectures

Last updated Aug 25, 2026|Copy as Markdown|[View as Markdown](https://4f1c5cd2.previews.developers.cloudflare.com/d1/demos/index.md)|[Agent setup](https://4f1c5cd2.previews.developers.cloudflare.com/agent-setup/)

Learn how you can use D1 within your existing application and architecture.

## Featured Demos

* [Starter code for D1 Sessions API ↗](https://github.com/cloudflare/templates/tree/main/d1-starter-sessions-api-template): An introduction to D1 Sessions API. This demo simulates purchase orders administration.  
[![Deploy to Cloudflare](https://deploy.workers.cloudflare.com/button)](https://deploy.workers.cloudflare.com/?url=https://github.com/cloudflare/templates/tree/main/d1-starter-sessions-api-template)

Tip: Place your database further away for the read replication demo

To simulate how read replication can improve a worst case latency scenario, select your primary database location to be in a farther away region (one of the deployment steps).

You can find this in the **Database location hint** dropdown.

## Reference architectures

Explore the following reference architectures that use D1:

[**Fullstack applications**A practical example of how these services come together in a real fullstack application architecture.](https://4f1c5cd2.previews.developers.cloudflare.com/reference-architecture/diagrams/serverless/fullstack-application/)

[**Ingesting BigQuery Data into Workers AI**You can connect a Cloudflare Worker to get data from Google BigQuery and pass it to Workers AI, to run AI Models, powered by serverless GPUs.](https://4f1c5cd2.previews.developers.cloudflare.com/reference-architecture/diagrams/ai/bigquery-workers-ai/)

[**Composable AI architecture**The architecture diagram illustrates how AI applications can be built end-to-end on Cloudflare, or single services can be integrated with external infrastructure and services.](https://4f1c5cd2.previews.developers.cloudflare.com/reference-architecture/diagrams/ai/ai-composable/)

[**Serverless global APIs**An example architecture of a serverless API on Cloudflare and aims to illustrate how different compute and data products could interact with each other.](https://4f1c5cd2.previews.developers.cloudflare.com/reference-architecture/diagrams/serverless/serverless-global-apis/)

[**Retrieval Augmented Generation (RAG)**RAG combines retrieval with generative models for better text. It uses external knowledge to create factual, relevant responses, improving coherence and accuracy in NLP tasks like chatbots.](https://4f1c5cd2.previews.developers.cloudflare.com/reference-architecture/diagrams/ai/ai-rag/)

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