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# dispatchRoute()

The `dispatchRoute()` function runs a server route in-process as the calling user. It expects a request context that Mastra server auth already authenticated, then applies what a server adapter applies to an HTTP request for that route: your auth provider's `authorize`, `authorizeUser`, and `rules`, schema validation, RBAC permission, and fine-grained authorization (FGA). It never allows a call the HTTP request would reject.

Use it to build another transport on top of the built-in routes, including streaming routes. For JSON routes called from a tool, [`invokeRoute()`](https://mastra.ai/reference/server/invoke-route) is the smaller API.

## Usage example

```typescript
import type { Mastra } from '@mastra/core/mastra'
import type { RequestContext } from '@mastra/core/request-context'
import { SERVER_ROUTES, dispatchRoute } from '@mastra/server/server-adapter'

const executeTool = SERVER_ROUTES.find(
  route => route.method === 'POST' && route.path === '/tools/:toolId/execute',
)!

export async function runWeatherTool(
  mastra: Mastra,
  requestContext: RequestContext,
  request: Request,
) {
  const outcome = await dispatchRoute(
    executeTool,
    { pathParams: { toolId: 'weather' }, body: { data: { city: 'Paris' } } },
    { mastra, requestContext, abortSignal: request.signal, request },
  )
  if (!outcome.ok) throw new Error(`Tool route failed with status ${outcome.status}`)
  return outcome.result
}
```

## Import

```typescript
import { dispatchRoute } from '@mastra/server/server-adapter'
```

## Signature

```typescript
function dispatchRoute(
  route: ServerRoute,
  input: DispatchRouteInput,
  context: ServerContext,
): Promise<DispatchRouteResult>
```

## Parameters

**route** (`ServerRoute`): The route to run, such as one from SERVER_ROUTES, exported from @mastra/server/handlers/\*, or created with \`createRoute()\`.

**input.pathParams** (`Record<string, unknown>`): Path parameters, validated against the route's pathParamSchema. Every :param in the route path needs a non-empty string that isn't . or ...

**input.query** (`Record<string, unknown>`): Query parameters, validated against the route's queryParamSchema.

**input.body** (`unknown`): Request body, validated against the route's bodySchema.

**context.mastra** (`Mastra`): The Mastra instance the route runs against.

**context.requestContext** (`RequestContext`): The caller's request context, already authenticated by Mastra server auth. Its user, permissions, and auth mode decide what the caller may do.

**context.abortSignal** (`AbortSignal`): Cancels the route handler.

**context.request** (`Request`): The caller's HTTP request. Its headers are passed to authorizeUser, and it's handed to route handlers that read the request.

**context.routePrefix** (`string`): The prefix of the server adapter whose paths apply, such as /api. Required when no adapter is registered, or when several are and the request context comes from none of them.

## Returns

A `DispatchRouteResult`, which is one of two shapes:

**ok** (`boolean`): true when the handler ran, false when a check failed or the handler threw.

**result** (`unknown`): When ok is true: the handler's raw return value. Streaming routes return their stream unconverted.

**status** (`number`): When ok is false: the HTTP status an adapter would have answered with, such as 400, 401, or 403.

**body** (`unknown`): When ok is false: the JSON error body an adapter would have sent.

## Behavior

- **Authentication isn't re-run.** When server or Studio auth is configured, the request context must already carry the user Mastra server auth resolved. Otherwise `dispatchRoute()` returns `401`, unless the route's path is public.
- **Authorization hooks see the HTTP path.** `authorize()`, `authorizeUser()`, and `rules` receive the route's method and the path it's served under: the adapter's prefix plus the route path with path parameters filled in.
- **The serving adapter's paths and checks apply.** Each adapter binds itself to the request contexts it creates, outside the context's entries so agent and tool code can't read it, so a route dispatched with that request context gets that adapter's prefix and overrides, even when another adapter serves the same Mastra instance under the same prefix. Outside a request, the only adapter serving the Mastra instance (or `context.routePrefix`) is used. If the adapter can't be told, or no adapter serves `routePrefix`, `dispatchRoute()` returns `401` for a caller without a user and throws otherwise. It never picks one of several adapters on its own.
- **Path parameters are checked like a URL.** A missing, empty, non-string, `.`, or `..` value returns `400`. An optional `:param?` can be left out.
- **Path parameters win.** A body or query field with the same name as a path parameter is overridden, so authorization and the handler act on the resource named in the path.
- **Protected patterns don't open other paths.** With auth configured, a route needs a user unless its path is declared public, even when it's outside your `protected` patterns.
- **Adapter overrides apply.** A `checkRoutePermission()` override on the serving `MastraServer` subclass also runs for dispatched routes.
- **`authorizeUser()` gets a stand-in request.** It receives a request for the dispatched route's path and method that carries the headers of `context.request` and no body.
- **Server context can't come from the input.** `request`, `routePrefix`, `registeredTools`, and `taskStore` reach the handler only from `context`, never from body or query fields with those names.

## Custom adapters

Adapters that extend `MastraServer` tell `dispatchRoute()` where they serve routes. An adapter that doesn't must register itself, and bind the returned handle to each request context it creates:

```typescript
import { bindDispatchAdapter, registerDispatchAdapter } from '@mastra/server/server-adapter'

const handle = registerDispatchAdapter(mastra, { prefix: '/api' })

// For each request:
bindDispatchAdapter(requestContext, handle)
```

An adapter that doesn't extend `MastraServer` can run the route permission and FGA checks of the built-in adapters with `authorizeRoute()`, after authenticating the request and validating its parameters. It resolves to `null` when the call is allowed, or to a `403` error to send back. `checkRouteRBAC()` runs the permission check alone.

```typescript
import { authorizeRoute } from '@mastra/server/server-adapter'

const denied = await authorizeRoute(mastra, route, params, requestContext)
if (denied)
  return Response.json({ error: denied.error, message: denied.message }, { status: denied.status })
```

## Related

- [`invokeRoute()`](https://mastra.ai/reference/server/invoke-route)
- [`createRoute()`](https://mastra.ai/reference/server/create-route)
- [Server routes](https://mastra.ai/reference/server/routes)