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

# Express

> Mount KavachOS auth routes on Express with `kavachExpress(kavach)`. Returns a Router with agent identity, delegation, audit, and MCP OAuth 2.1 endpoints pre-mounted.

`kavachExpress(kavach, options?)` returns an Express `Router` with all KavachOS routes pre-mounted. Use `app.use` to attach it at your chosen path.

## Install

```bash theme={"system"}
pnpm add kavachos @kavachos/express express
pnpm add -D @types/express
```

## Setup

<Steps>
  <Step title="Create the kavach instance">
    ```typescript theme={"system"}
    // lib/kavach.ts
    import { createKavach, createMcpModule } from 'kavachos';

    export const kavach = createKavach({
      database: { provider: 'postgres', url: process.env.DATABASE_URL! },
      baseUrl: process.env.AUTH_BASE_URL!,
      mcp: {
        issuer: process.env.AUTH_BASE_URL!,
        audience: process.env.MCP_BASE_URL!,
      },
    });

    export const mcp = createMcpModule(kavach);
    ```
  </Step>

  <Step title="Mount the adapter">
    ```typescript theme={"system"}
    // src/index.ts
    import express from 'express';
    import { kavachExpress } from '@kavachos/express';
    import { kavach, mcp } from './lib/kavach.js';

    const app = express();

    // Required: parse JSON and URL-encoded bodies before the adapter
    app.use(express.json());
    app.use(express.urlencoded({ extended: true }));

    // Mount all KavachOS routes
    app.use('/api/kavach', kavachExpress(kavach, { mcp }));

    app.listen(3000);
    ```
  </Step>
</Steps>

<Warning>
  Call `express.json()` and `express.urlencoded()` before mounting the adapter. The adapter reads `req.body` which requires those parsers to be in place.
</Warning>

## MCP endpoints

Pass `mcp` to enable the MCP OAuth 2.1 authorization server. All MCP endpoints are registered on the same router alongside the REST API:

```typescript theme={"system"}
app.use('/api/kavach', kavachExpress(kavach, { mcp }));
// registers:
// GET  /api/kavach/.well-known/oauth-authorization-server
// GET  /api/kavach/.well-known/oauth-protected-resource
// POST /api/kavach/mcp/register
// GET  /api/kavach/mcp/authorize
// POST /api/kavach/mcp/token
```

## Endpoint reference

| Method   | Path                    | Description               |
| -------- | ----------------------- | ------------------------- |
| `POST`   | `/agents`               | Create an agent           |
| `GET`    | `/agents`               | List agents               |
| `GET`    | `/agents/:id`           | Get an agent              |
| `PATCH`  | `/agents/:id`           | Update an agent           |
| `DELETE` | `/agents/:id`           | Revoke an agent           |
| `POST`   | `/agents/:id/rotate`    | Rotate token              |
| `POST`   | `/authorize`            | Authorize by agent ID     |
| `POST`   | `/authorize/token`      | Authorize by bearer token |
| `POST`   | `/delegations`          | Create delegation         |
| `GET`    | `/delegations/:agentId` | List delegation chains    |
| `DELETE` | `/delegations/:id`      | Revoke delegation         |
| `GET`    | `/audit`                | Query audit logs          |
| `GET`    | `/audit/export`         | Export audit logs         |

## Full example

```typescript theme={"system"}
import express from 'express';
import { createKavach, createMcpModule } from 'kavachos';
import { kavachExpress } from '@kavachos/express';

const kavach = createKavach({
  database: { provider: 'postgres', url: process.env.DATABASE_URL! },
  baseUrl: process.env.AUTH_BASE_URL!,
  mcp: {
    issuer: process.env.AUTH_BASE_URL!,
    audience: process.env.MCP_BASE_URL!,
  },
});

const mcp = createMcpModule(kavach);

const app = express();
app.use(express.json());
app.use(express.urlencoded({ extended: true }));

app.use('/api/kavach', kavachExpress(kavach, { mcp }));

app.get('/health', (_req, res) => res.json({ ok: true }));

app.listen(3000, () => {
  console.log('Server running on port 3000');
});
```