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make auth token configurable via env var #517

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make auth token configurable via env var
kentcdodds Jun 17, 2025
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docs: add note in readme
kentcdodds Jun 17, 2025
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6 changes: 6 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -166,6 +166,12 @@ If you need to disable authentication (NOT RECOMMENDED), you can set the `DANGER
DANGEROUSLY_OMIT_AUTH=true npm start
```

You can also set the token via the `MCP_PROXY_AUTH_TOKEN` environment variable when starting the server:

```bash
MCP_PROXY_AUTH_TOKEN=$(openssl rand -hex 32) npm start
```

#### Local-only Binding

By default, the MCP Inspector proxy server binds only to `127.0.0.1` (localhost) to prevent network access. This ensures the server is not accessible from other devices on the network. If you need to bind to all interfaces for development purposes, you can override this with the `HOST` environment variable:
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2 changes: 1 addition & 1 deletion server/src/index.ts
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Expand Up @@ -89,7 +89,7 @@ app.use((req, res, next) => {
const webAppTransports: Map<string, Transport> = new Map<string, Transport>(); // Web app transports by web app sessionId
const serverTransports: Map<string, Transport> = new Map<string, Transport>(); // Server Transports by web app sessionId

const sessionToken = randomBytes(32).toString("hex");
const sessionToken = process.env.MCP_PROXY_AUTH_TOKEN || randomBytes(32).toString("hex");
const authDisabled = !!process.env.DANGEROUSLY_OMIT_AUTH;

// Origin validation middleware to prevent DNS rebinding attacks
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