> ## 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.

# RateLimitingMiddleware

Defined in: [server/middleware.ts:244](https://github.com/PrefectHQ/fastmcp-ts/blob/8976c37f79efa6b87809b884f29a1f235a8c4ad1/src/server/middleware.ts#L244)

Fixed-window counter rate limiter. Resets to full capacity after every windowMs interval.

## Implements

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

## Constructors

### Constructor

```ts theme={null}
new RateLimitingMiddleware(limit, windowMs?): RateLimitingMiddleware;
```

Defined in: [server/middleware.ts:248](https://github.com/PrefectHQ/fastmcp-ts/blob/8976c37f79efa6b87809b884f29a1f235a8c4ad1/src/server/middleware.ts#L248)

#### Parameters

##### limit

`number`

##### windowMs?

`number` = `60_000`

#### Returns

`RateLimitingMiddleware`

## Methods

### onRequest()

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

Defined in: [server/middleware.ts:256](https://github.com/PrefectHQ/fastmcp-ts/blob/8976c37f79efa6b87809b884f29a1f235a8c4ad1/src/server/middleware.ts#L256)

#### 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)