What Is SharePoint REST API? SharePoint Definition and Guide
The SharePoint REST API is the web service exposed through SharePoint's _api endpoints for creating, reading, updating, and deleting SharePoint sites, lists, libraries, items, files, users, permissions, search settings, and other supported objects. It uses HTTP requests and OData conventions so applications can work with SharePoint without a server-side SharePoint object model.
What SharePoint REST API Means in SharePoint
A client addresses a site-relative endpoint, authenticates through Microsoft Entra and SharePoint, requests JSON, and uses HTTP verbs such as GET, POST, PATCH or MERGE, and DELETE according to the endpoint. Request digests, ETags, batching, pagination, content types, and endpoint-specific behavior matter for reliable updates and concurrency.
SharePoint REST overlaps with Microsoft Graph but is not obsolete. Graph offers a unified Microsoft 365 endpoint and is often preferred for cross-service development, while SharePoint REST exposes SharePoint-specific capabilities that Graph does not always cover. Architects should choose per requirement rather than forcing every operation through one API.
Why It Matters to the Business
APIs can automate provisioning, content movement, integrations, reporting, and custom experiences that would be slow or inconsistent by hand. The business benefit depends on supportable authentication, ownership, monitoring, and error handling. A script that works once from an administrator's browser is not a production integration.
Data access must follow least privilege and business purpose. App-only permissions can expose large content scopes, and item-level automation can create noise or break inheritance. Owners should approve the data, actions, service levels, retention, and failure behavior of each integration.
What SharePoint Administrators Need to Know
Developers should use current Microsoft Entra authentication and supported permission models, handle throttling and retries, follow pagination, protect secrets or certificates, and test optimistic concurrency with ETags. Avoid retired Azure ACS and legacy SharePoint Add-In authentication patterns in new SharePoint Online solutions.
Define telemetry, correlation IDs, idempotency, audit logging, failure queues, schema-change handling, and a support owner. Validate large lists, special characters, file sizes, checked-out documents, versioning, permissions, retention, and regional endpoints. Review Microsoft deprecations and API behavior during service updates.
What to Consider
Use modern authentication
Register the application in Microsoft Entra, request the narrowest supported permissions, protect credentials, and rotate them through a documented process.
Engineer for cloud behavior
Handle throttling, retries, pagination, concurrency, partial failure, timeouts, and idempotency instead of assuming a local network call.
Choose REST or Graph deliberately
Map each requirement to supported endpoints, permissions, batching, webhooks, and lifecycle rather than treating the APIs as interchangeable.
Practical Takeaway
Use SharePoint REST for supported SharePoint-specific operations when it is the best-fit API, with modern Entra authentication, least privilege, resilient cloud patterns, and production monitoring.
How This Shows Up in the Field
Library integration
A line-of-business service creates folders, uploads files, sets metadata, and records failures using app permissions limited to approved sites.
Governance report
A scheduled job reads site and list configuration, follows pagination and throttling guidance, and writes evidence without changing production content.
SharePoint REST and Microsoft Graph
| SharePoint REST API | Provides SharePoint-specific endpoints under a site's _api path for content, configuration, search, and administrative operations. |
|---|---|
| Microsoft Graph | Provides a unified endpoint across Microsoft 365, including sites, lists, drives, permissions, groups, users, and many other services. |
| SharePoint Online Management Shell | Provides administrator-focused PowerShell cmdlets for tenant and site management rather than an application HTTP API. |
Related 6SC Services and Proof
Related SharePoint Glossary Terms
Frequently Asked Questions
Is the SharePoint REST API deprecated?
No. SharePoint REST remains a supported API for SharePoint-specific capabilities. However, legacy SharePoint Add-In and Azure ACS authentication models are retired in SharePoint Online; use current Entra authentication.
Should new solutions use Microsoft Graph instead?
Use Graph when its unified Microsoft 365 endpoints cover the requirement well. Use SharePoint REST for supported SharePoint-specific operations or gaps. Many production architectures use both deliberately.
What is the SharePoint _api URL?
SharePoint REST endpoints are addressed relative to a SharePoint site, commonly with /_api followed by the resource path. Authentication, permissions, headers, OData behavior, and endpoint documentation still apply.
Official Microsoft References
Editorial review date: July 13, 2026. Product status and licensing can change; confirm current Microsoft documentation before implementation.
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