What is odata

Last updated: April 1, 2026

Quick Answer: OData (Open Data Protocol) is a standardized, open protocol for building and consuming REST APIs that enables queryable data exchange between applications and services across the web.

Key Facts

What is OData?

OData (Open Data Protocol) is an open standard for creating REST APIs that make data queryable and interoperable across different applications and platforms. Developed by Microsoft and standardized by OASIS, OData enables simple, lightweight data exchange over HTTP.

Core Features

OData provides powerful query capabilities through a standardized URI convention. Instead of hardcoded endpoints, clients can build dynamic queries using parameters like $filter (filter data), $select (choose specific fields), $orderby (sort results), and $expand (retrieve related data). This reduces over-fetching and under-fetching of data.

How OData Works

OData services expose data as entity sets that clients can access via REST endpoints. A client sends HTTP requests with OData query parameters to retrieve, create, update, or delete data. The server responds with JSON or XML formatted data, making it easy to integrate across different systems without custom API design for each interaction.

Real-World Applications

Advantages and Standards

OData provides standardization across organizations, reducing development time when integrating disparate systems. It includes built-in support for metadata discovery, type safety, and data validation. The protocol is version-agnostic and regularly updated by OASIS to include new features and security enhancements.

Related Questions

What is the difference between OData and REST APIs?

While all OData services are REST APIs, not all REST APIs are OData. OData is a standardized protocol that specifies query conventions and metadata, whereas REST APIs can follow various conventions. OData provides consistent querying across different services.

How do you query data using OData?

OData queries use URI parameters appended to the base endpoint. For example, `/products?$filter=price gt 100&$select=name,price&$orderby=name` filters products over $100, shows only name and price, and sorts by name alphabetically.

What formats does OData support?

OData primarily supports JSON and XML response formats. Modern OData services typically default to JSON due to its lighter weight and widespread browser support, though XML remains available for legacy systems and specific use cases.

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Sources

  1. OData.org - Official Website CC-BY-SA-4.0
  2. Wikipedia - Open Data Protocol CC-BY-SA-4.0
  3. Microsoft - OData Documentation CC-BY-4.0