> ## Documentation Index
> Fetch the complete documentation index at: https://docs.usebruno.com/llms.txt
> Use this file to discover all available pages before exploring further.

# OpenAPI and Bruno

OpenAPI Specification (OAS) is a standard format for reading and describing HTTP APIs. This allows people to understand how an API works, how a sequence of APIs work together, generate client code, create tests, apply design standards, and more.

Bruno allows you to work with OpenAPI Specification (OAS) files in a number of ways. **Import** supports both **OpenAPI 2.0** (Swagger 2.0) and **OpenAPI 3.x**; see [Import an OpenAPI Spec](/open-api/importOAS) for details.

* [Creating a collection from an OAS file import](/open-api/importOAS)
* [Exporting a collection as an OAS file](/open-api/exportOAS)
* [Viewing and Designing an OAS file](/open-api/createOAS)