SAP CAP OData to REST Adapter

This project demonstrates how to use SAP CAP to provide custom REST Services based on existing OData services.

Reasons why you want or need to create such an adapter:

• Specific architecture requirements, e.g., harmonization of how services look like accross the enterprise
• Access a service using different URL patterns, i.e., ressource/{id} instead of ressource('{id}')
• Change structure and content of the payload, e.g., delete, add, change, rename, combine, etc. of fields
• Change the standard OData query paramater names, e.g., pagination with ?pageSize and ?offset instead of $top and $skip
• Reuse existing services without re-implementing them, e.g., OData services but also REST or classic "non-compliant" WS Services

Project Structure

File or Folder	Purpose
srv/	exposed curstom REST service and transformation logic
srv/external	imported OData .edmx metadata
package.json	project metadata and configuration
.cdsrc.json	service destination configuration

Run the Code

• Open a new terminal and run cds watch
• Open http://localhost:4004/northwind/Categories

Related Blog Post

• https://blog.kai-niklas.de/posts/12-sap-cap-adapter-odata-custom-rest/

Learn More about SAP CAP

Learn more at https://cap.cloud.sap/docs/get-started/.