# MultipartPart

**Kind:** Interface

**Source:** [`atloria-monorepo/libs/parser-core/src/openapi/multipart.ts`](https://github.com/sherkety/atloria/blob/main/atloria-monorepo/libs/parser-core/src/openapi/multipart.ts#L20)

multipart/form-data detection → OpenAPI request bodies.

Every framework parser walked file-upload handlers as if they took JSON, so an endpoint
declared with `@UseInterceptors(FileInterceptor('file'))` published as
`content: { 'application/json': … }`. A reader given that spec draws a JSON body editor and
cannot perform the upload at all — `format: binary` is the single token that makes it draw a
file picker instead, and nothing in the pipeline was ever emitting one.

Detection is deliberately TEXT-based and scoped to the smallest slice that can carry the
signal (a handler's decorators + signature, a route's middleware arguments, a view body).
The signals are literal by nature — the interceptor/middleware call NAMES the wire field —
so a regex over a bounded slice reads them exactly, in every language, without needing a
per-language type checker. The narrow slice is what keeps false positives out: mislabelling a
JSON endpoint as an upload is worse than the bug being fixed, since it replaces a working
body editor with a file picker that cannot send the request.

## Properties

| Property | Type |
|---|---|
| `name` | `string` |
| `kind` | `'file' | 'field'` |
| `multiple` | `boolean` |
| `required` | `boolean` |
| `type` | `string` |