# trimTrailingSlash

**Kind:** Function

**Source:** [`src/middleware/trailing-slash/index.ts`](https://github.com/honojs/hono/blob/main/src/middleware/trailing-slash/index.ts#L44)

**Part of:** [Middleware](subsystem-src-middleware)

Trailing Slash Middleware for Hono.

`trimTrailingSlash` creates Hono middleware that redirects requests whose path ends with a trailing slash to the equivalent path without it. It keeps route URLs consistent before the request continues through the application middleware and route handlers.

## Signature

```ts
function trimTrailingSlash(options: TrimTrailingSlashOptions): MiddlewareHandler
```

## Parameters

| Name | Type |
|---|---|
| `options` | `TrimTrailingSlashOptions` |

**Returns:** `MiddlewareHandler`

## Diagram

```mermaid
graph LR
  Request[Incoming request] --> Middleware[trimTrailingSlash middleware]
  Middleware --> Check{Path has trailing slash?}
  Check -->|Yes| Redirect[Redirect to trimmed path]
  Check -->|No| Next[Continue to next middleware or route]
```

## Usage

```ts
import { Hono } from 'hono'
import { trimTrailingSlash } from 'hono/trailing-slash'

const app = new Hono()

app.use(trimTrailingSlash())

app.get('/users', (c) => {
  return c.text('User list')
})

export default app
```

## AI Coding Instructions

- Register `trimTrailingSlash()` before routes that should use normalized paths.
- Import the middleware from `hono/trailing-slash`.
- Keep route definitions without trailing slashes when this middleware is enabled.
- Do not add separate trailing-slash route variants unless they require different behavior.