> ## Documentation Index
> Fetch the complete documentation index at: https://colin-feat-client-cache-mode.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# SizeLimitingMiddleware

Defined in: [server/middleware.ts:271](https://github.com/PrefectHQ/fastmcp-ts/blob/8976c37f79efa6b87809b884f29a1f235a8c4ad1/src/server/middleware.ts#L271)

Rejects responses whose JSON serialisation exceeds maxBytes.

## Implements

* [`Middleware`](/api/server/interfaces/Middleware)

## Constructors

### Constructor

```ts theme={null}
new SizeLimitingMiddleware(maxBytes): SizeLimitingMiddleware;
```

Defined in: [server/middleware.ts:272](https://github.com/PrefectHQ/fastmcp-ts/blob/8976c37f79efa6b87809b884f29a1f235a8c4ad1/src/server/middleware.ts#L272)

#### Parameters

##### maxBytes

`number`

#### Returns

`SizeLimitingMiddleware`

## Methods

### onRequest()

```ts theme={null}
onRequest(ctx, next): Promise<unknown>;
```

Defined in: [server/middleware.ts:274](https://github.com/PrefectHQ/fastmcp-ts/blob/8976c37f79efa6b87809b884f29a1f235a8c4ad1/src/server/middleware.ts#L274)

#### Parameters

##### ctx

[`MiddlewareContext`](/api/server/interfaces/MiddlewareContext)

##### next

[`Next`](/api/server/type-aliases/Next)

#### Returns

`Promise`\<`unknown`>

#### Implementation of

[`Middleware`](/api/server/interfaces/Middleware).[`onRequest`](/api/server/interfaces/Middleware#onrequest)