---
lang: en
title: 'API docs: openapi-v3.controllerspec.basepath'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/openapi-v3
permalink: /doc/en/lb4/apidocs.openapi-v3.controllerspec.basepath.html
---

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[Home](./index.md) &gt; [@loopback/openapi-v3](./openapi-v3.md) &gt; [ControllerSpec](./openapi-v3.controllerspec.md) &gt; [basePath](./openapi-v3.controllerspec.basepath.md)

## ControllerSpec.basePath property

The base path on which the Controller API is served. If it is not included, the API is served directly under the host. The value MUST start with a leading slash (/).

**Signature:**

```typescript
basePath?: string;
```