> For the complete documentation index, see [llms.txt](https://galactic-bridge.gitbook.io/galactic-bridge-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://galactic-bridge.gitbook.io/galactic-bridge-docs/run-it-yourself.md).

# Run it yourself

The bridge is open source and runs locally with no server of your own.

## Windows

1. Install [Node.js LTS](https://nodejs.org/).
2. Download or clone [the repository](https://github.com/mckellen-eth/galactic-bridge).
3. Double-click **`start.bat`**.

On first run it creates a config file, installs dependencies and opens two console windows. Open `http://localhost:5173` when the frontend window is ready.

## macOS and Linux

```bash
git clone https://github.com/mckellen-eth/galactic-bridge.git
cd galactic-bridge
cp .env.example .env          # then edit .env, see below

cd backend  && npm install && cd ..
cd frontend && npm install && cd ..

grep '^VITE_' .env > frontend/.env

# terminal 1
cd backend && node server.js

# terminal 2
cd frontend && npm run dev
```

## Configuration

| Variable                 | Required | What it does                                                                                            |
| ------------------------ | -------- | ------------------------------------------------------------------------------------------------------- |
| `VITE_REOWN_PROJECT_ID`  | **Yes**  | Wallet connection. Get your own free ID at [dashboard.reown.com](https://dashboard.reown.com).          |
| `VITE_CF_BEACON_TOKEN`   | No       | Cloudflare Web Analytics, only if you host a public site. Empty means no analytics script loads at all. |
| `PORT`                   | No       | Backend port, default `3001`.                                                                           |
| `ALLOWED_ORIGINS`        | No       | Comma-separated CORS allowlist. Empty means open, which is fine for local use. Set it in production.    |
| `RL_MAX`, `RL_WINDOW_MS` | No       | Rate limit per IP, default 60 requests per 15 seconds.                                                  |
| `LOGS_RPC_<CHAIN>`       | No       | Archive RPC for one network — see [RPC nodes](/galactic-bridge-docs/rpc-nodes.md).                      |
| `RPC_FALLBACK_<CHAIN>`   | No       | Backup node used only when the public ones fail.                                                        |

{% hint style="warning" %}
Get your **own** Reown Project ID. It is tied to an account and has its own quota — reusing somebody else's will not work reliably. Without it the wallet window opens empty.
{% endhint %}

{% hint style="info" %}
`frontend/.env` is generated from the `VITE_` lines of the root `.env`. On Windows `start.bat` does this automatically; elsewhere run the `grep` command shown above. Vite reads environment variables only at startup, so restart the dev server after changing them.
{% endhint %}

## Adding a network

Add an entry to the `CHAINS` object in **both** `backend/lib/chains.js` and `frontend/src/lib/chains.js`, then register the chain for the wallet in `frontend/src/main.jsx`.

Take the endpoint ID (`eid`) from the [LayerZero deployments list](https://docs.layerzero.network/v2/deployments/deployed-contracts) — it is not the same number as the chain ID.


---

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