Web API

The Dataverse Web API is the HTTP REST endpoint at /api/data/v9.x/ that exposes Dataverse for programmatic access. It supports OData v4 query syntax ($filter, $select, $expand, etc.), full CRUD operations (GET, POST, PATCH, DELETE) on every entity, bound actions, custom actions, and batch operations through the $batch endpoint for multi-operation HTTP round-trips. Authentication uses Microsoft Entra ID OAuth 2.0 — service-principal or user-context tokens. The Web API is the primary integration surface for Dataverse from external systems, JavaScript on forms (via Xrm.WebApi), Power Automate flows, custom code, and SDK clients. It superseded the older SOAP-based Organization Service for most modern use cases.

In practice, the $batch endpoint matters more than its documentation entry suggests — it lets a client bundle dozens of individual create, update, or read operations into a single HTTP round trip, which is the difference between an integration that respects Dataverse's request limits comfortably and one that burns through them processing a modest daily volume one record at a time. Most integrations that hit throttling limits unnecessarily are making one HTTP call per record instead of batching, not genuinely exceeding a reasonable request volume.

Where confusion shows up: OData's query syntax ($filter, $select, $expand) looks like SQL at a glance but has real limits SQL doesn't — deeply nested $expand queries and certain filter patterns on calculated or rollup columns can be significantly slower or simply unsupported, and testing a query against realistic data volumes before building an integration around it avoids surprises that only surface at production scale. Authentication is also a common trip point for new integrators: a service-principal (application) token and a user-context token behave differently against Dataverse's security model, since the API still enforces the same security roles either way — a service principal needs its own application user record with real privileges, not just a valid Entra ID token.