> ## Documentation Index
> Fetch the complete documentation index at: https://nexus.whatsgood.dog/llms.txt
> Use this file to discover all available pages before exploring further.

# Cloudflare

> Learn how to use Nexus as a Cloudflare Worker

## Setup

<CodeGroup>
  ```typescript index.ts theme={null}
  import {
    Nexus,
    NodeProvider,
    CHAIN,
    NexusServerInstance,
  } from "@whatsgood/nexus";

  let nexus: NexusServerInstance;

  function createNexus(env: Record<string, string>) {
    // Step 1: Initialize node providers
    const llamaRpcNodeProvider = new NodeProvider({
      name: "llama-rpc",
      chain: CHAIN.ETHEREUM_MAINNET,
      url: "https://eth.llamarpc.com",
    });

    const tenderlyNodeProvider = new NodeProvider({
      name: "tenderly",
      chain: CHAIN.ETHEREUM_MAINNET,
      url: "https://gateway.tenderly.co/public/mainnet",
    });

    // Step 2: Create a Nexus instance
    const nexus = Nexus.create({
      nodeProviders: [llamaRpcNodeProvider, tenderlyNodeProvider],
      log: { level: "debug", colorize: false },
      port: 4000,
      relay: {
        order: "random",
      },
      env,
    });

    // Step 3: Optionally define event handlers
    nexus.on("rpcResponseSuccess", (response, ctx) => {
      nexus.logger.debug(
        {
          response: response.body(),
          chain: ctx.chain,
        },
        "rpc response success event captured"
      );
    });

    return nexus;
  }

  // Step 4: Set the fetch handler
  export default {
    fetch: (request: Request, env: Record<string, string>) => {
      if (!nexus) {
        nexus = createNexus(env);
      }
      return nexus(request);
    },
  };
  ```

  ```toml wrangler.toml theme={null}
  name = "nexus-worker"
  main = "src/index.ts"
  compatibility_date = "2023-09-22"
  compatibility_flags = ["nodejs_compat"]
  ```
</CodeGroup>

## Usage

<Snippet file="send-a-request-no-auth.mdx" />