Background

“Consumer friendly API Documentation is the key for successfull implementation of API First Strategy as it directly impacts the wider adoption and consumption of API(S) across external and internal suppliers and partners.”

While swagger or SAP API designer provides a beautiful way to document API(S) for API consumers via RAML/YAML, it is a manual job for API providers generally to build the API definition i.e RAML in the editors from the scratch especially when the request/response structures are complex i.e SAP Objects or when API(S) are built and handed over to support team without any documentation.

The following tutorial will provide a mechanism on how to auto-generate API documentation using Swagger Inspector for rest API(S) exposed in SAP CPI or SAP PO or API definition in SAP API management instead of manually typing the RAML to create API definition. Please use CORS Chrome Extension if you face CORS issue when sending messages to CPI  via Swagger Inspector.

Tutorial

Step1: Create a small CPI package  AutoGenerateSwaggerForAPI with a content modifier step that accepts the request and sends the JSON response.

Step 2:  Open http://inspector.swagger.io/builder on browser

Step 3: Test CPI Endpoint http://CPITenant-iflmap.hcisbp.eu1.hana.ondemand.com/http/SuccessFactors/EmployeeRequest by passing the required required body and username/password in authorization header.

Step 4: Test CPI Endpoint http://CPITenant-iflmap.hcisbp.eu1.hana.ondemand.com/http/SuccessFactors/EmployeeResponse by passing the required response body and username/password in authorization header.

Step 5: Create API Definition by selecting both the Employee request / response and pressing “Create API Definition”

Step 6: Create Swagger User and sign up

Step 7:  Go to Swagger hub and press import open API definition From inspector as shown below:

Step 8: Swagger API Definition for Employee Request/Response should be generated and screen should look like this.

Step 9: You can check request schema and response schema as shown below:

Step 10: You can Download Swagger/OpenAPI JSON as shown below: