# defaultJoin

**Kind:** Function

**Source:** [`src/middleware/serve-static/path.ts`](https://github.com/honojs/hono/blob/main/src/middleware/serve-static/path.ts#L5)

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

`defaultJoin` does not support Windows paths and always uses `/` separators.
If you need Windows path support, please use `join` exported from `node:path` etc. instead.

`defaultJoin` combines path segments for the static-file middleware using `/` separators. It is intended for URL-style or POSIX-style paths and does not support Windows path conventions; use `join` from `node:path` when Windows support is needed.

## Signature

```ts
function defaultJoin(paths: string[]): string
```

## Parameters

| Name | Type |
|---|---|
| `paths` | `string[]` |

**Returns:** `string`

## Diagram

```mermaid
graph LR
  A[Path segments] --> B[defaultJoin]
  B --> C[Slash-normalized path]
  C --> D[Static file lookup]
```

## Usage

```ts
import { defaultJoin } from './path'

const filePath = defaultJoin('/public/', '/assets', 'app.js')

console.log(filePath)
// /public/assets/app.js
```

## AI Coding Instructions

- Keep path segments in URL or POSIX format when calling `defaultJoin`.
- Do not use `defaultJoin` for Windows filesystem paths.
- Use `join` from `node:path` when the runtime must support platform-specific separators.
- Pass the joined result into static-file path resolution rather than manually concatenating segments.

## Used by

1 reference from 1 file. Each is a place in this repository where the symbol is actually used — go read one rather than trusting an example.

### Imported by (1)

- `ServeStaticOptions` — `src/middleware/serve-static/index.ts`:13