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SAP APIs · Lesson

REST

Quick answer

Prefer REST/OData for UIs, mobile, and modern web integrations, and whenever you consume S/4HANA cloud APIs.

Key takeaways

  • SAP’s primary RESTful interface is OData, a standardised REST protocol returning JSON, with rich query options.
  • OData supports $filter, $select, $expand, $orderby and paging ($top/$skip), so clients fetch exactly what they need.
  • In SAP, "REST API" in practice usually means OData services.
  • Watch out: Over-fetching without $filter/$select/$top.

REST and OData in SAP

SAP’s primary RESTful interface is OData, a standardised REST protocol returning JSON, with rich query options. OData services expose SAP business data and operations to Fiori, mobile apps, and external systems. S/4HANA and cloud products publish many OData APIs (on the Business Accelerator Hub), and you can build your own from CDS.

A REST/OData call

GET /sap/opu/odata/sap/API_SALES_ORDER_SRV/A_SalesOrder?$filter=SoldToParty eq '1000'&$top=20
Authorization: Bearer <token>
Accept: application/json

Query options

OData supports $filter, $select, $expand, $orderby and paging ($top/$skip), so clients fetch exactly what they need. This precision keeps integrations efficient, request minimal data rather than pulling everything and filtering client-side.

When to use it

Prefer REST/OData for UIs, mobile, and modern web integrations, and whenever you consume S/4HANA cloud APIs. It is the strategic direction; reserve SOAP and RFC for classic or SAP-to-SAP scenarios.

Common pitfalls

  • Over-fetching without $filter/$select/$top.
  • Ignoring OData error handling.
  • Using RFC/SOAP where OData fits better.

Want to learn this properly?

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Check your understanding

  1. Which statement is true of REST?

    • A. SQL is the primary language for querying and manipulating data in HANA, and SQLScript extends it for…
    • B. OData services expose SAP business data and operations to Fiori, mobile apps, and external systems.
    • C. These CDS examples show Core Data Services views, the modern SAP modeling layer, with joins, associations…
    Show answer

    B. OData services expose SAP business data and operations to Fiori, mobile apps, and external systems.

    Covered in the “REST and OData in SAP” section of this lesson.

  2. Which of these also applies to REST?

    • A. Insufficient memory for the dataset.
    • B. S/4HANA and cloud products publish many OData APIs (on the Business Accelerator Hub), and you can build your…
    • C. Row-by-row processing instead of set-based SQL.
    Show answer

    B. S/4HANA and cloud products publish many OData APIs (on the Business Accelerator Hub), and you can build your…

    Covered in the “REST and OData in SAP” section of this lesson.

  3. Which part of the Learn SAP curriculum covers REST?

    • A. SAP installation
    • B. SAP modules hub
    • C. SAP APIs
    Show answer

    C. SAP APIs

    This lesson sits in the SAP APIs section of the Learn SAP course.

Frequently asked questions

What does REST stand for in SAP?

REST/OData is the modern way to access SAP over HTTP with JSON, the interface behind Fiori and most cloud and web integrations. In SAP, "REST API" in practice usually means OData services.

What is the Fiori angle on REST?

SAP’s primary RESTful interface is OData, a standardised REST protocol returning JSON, with rich query options.

What is connected to REST in an SAP landscape?

Prefer REST/OData for UIs, mobile, and modern web integrations, and whenever you consume S/4HANA cloud APIs.

What tends to go wrong with REST?

Over-fetching without $filter/$select/$top. Ignoring OData error handling. Using RFC/SOAP where OData fits better.
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