# Setting Up Subtrace in Cloudflare Workers

Here’s a quick guide to setting up Subtrace in your Cloudflare Workers. First, add `@subtrace/cloudflare` to your Worker `package.json`:

```
npm install @subtrace/cloudflare
```

Wrap your Worker’s `fetch` handler to use the Subtrace middleware:

### src/index.js

```
import { subtrace } from "@subtrace/cloudflare";

export default {
  fetch: subtrace(async (request, env, ctx) => {
    return new Response("Hello World!");
  }),
};
```

Set a `SUBTRACE_TOKEN` environment variable in your [Wrangler config file](https://developers.cloudflare.com/workers/wrangler/configuration/):

### wrangler.jsonc

```
{
  "name": "my-worker",
  "main": "src/index.js",
  "compatibility_date": "2025-09-27",
  "vars": {
    // Go to https://subtrace.dev/dashboard to generate a token
    "SUBTRACE_TOKEN": "subt_..."
  }
}
```

Deploy your Cloudflare Worker:

```
npx wrangler deploy
```

And that’s it, you can now see all inbound and outbound HTTP requests in your Cloudflare Worker via the [Subtrace dashboard](/content/dashboard/index.html)!

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