GitHub Repository

You can find the project source code on GitHub.

This guide provides detailed, step-by-step instructions on how to use Upstash RAG Chat with Hono. You can also explore our Cloudflare Workers - Hono example for detailed, end-to-end examples and best practices.

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Project Setup

Create a new Hono application with cloudflare-workers template and install @upstash/rag-chat package.

npm create hono@latest my-app
cd my-app
npm install @upstash/rag-chat

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Setup Upstash Redis

Create a Redis database using Upstash Console or Upstash CLI and copy the UPSTASH_REDIS_REST_URL and UPSTASH_REDIS_REST_TOKEN into your .dev.vars file.

.dev.vars
UPSTASH_REDIS_REST_URL=<YOUR_URL>
UPSTASH_REDIS_REST_TOKEN=<YOUR_TOKEN>

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Setup Upstash Vector

Create a Vector index using Upstash Console or Upstash CLI and copy the UPSTASH_VECTOR_REST_URL and UPSTASH_VECTOR_REST_TOKEN into your .dev.vars file.

.dev.vars
UPSTASH_VECTOR_REST_URL=<YOUR_URL>
UPSTASH_VECTOR_REST_TOKEN=<YOUR_TOKEN>

​
Setup QStash LLM

Navigate to QStash Console and copy the QSTASH_TOKEN into your .dev.vars file.

.dev.vars
QSTASH_TOKEN=<YOUR_TOKEN>

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Create a Hono App

Note that we are using the @upstash/redis/cloudflare package and setting cache to false in the Index constructor to be able to work in Cloudflare Workers, these are not related to Hono.

Update /src/index.ts:

/src/index.ts
import { Hono } from 'hono'
import { RAGChat, upstash } from "@upstash/rag-chat";
import { Index } from "@upstash/vector";
import { Redis } from "@upstash/redis/cloudflare";

const app = new Hono<{
  Bindings: {
    UPSTASH_REDIS_REST_URL: string;
    UPSTASH_REDIS_REST_TOKEN: string;
    UPSTASH_VECTOR_REST_URL: string;
    UPSTASH_VECTOR_REST_TOKEN: string;
    QSTASH_TOKEN: string;
  };
}>();

app.get('/', async (c) => {
  const ragChat = new RAGChat({
    redis: new Redis({
      token: c.env.UPSTASH_REDIS_REST_TOKEN,
      url: c.env.UPSTASH_REDIS_REST_URL
    }),
    vector: new Index({
      token: c.env.UPSTASH_VECTOR_REST_TOKEN,
      url: c.env.UPSTASH_VECTOR_REST_URL,
      cache: false
    }),
    model: upstash("meta-llama/Meta-Llama-3-8B-Instruct", {
      apiKey: c.env.QSTASH_TOKEN
    }),
  });

  const response = await ragChat.chat("What is the speed of light?");
  return c.text(response.output)
})

export default app

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Run

Run the Hono application locally:

npm run dev

Visit http://localhost:8787

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Deploy

For deployment, use the wrangler CLI to securely set environment variables. Run the following command for each secret:

npx wrangler secret put SECRET_NAME

Replace SECRET_NAME with the actual name of each environment variable (e.g., UPSTASH_REDIS_REST_URL).

Deploy the Hono application:

npm run deploy

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