A REST API is an architectural style for web services that uses standard HTTP methods and stateless communication to manage resources.
Also known as: RESTful API, REST, Representational State Transfer
A REST API (Representational State Transfer Application Programming Interface) is a web service architecture that uses standard HTTP methods to create, read, update, and delete resources. REST defines a set of constraints — statelessness, uniform interface, client-server separation, and layered architecture — that produce scalable, maintainable, and interoperable APIs.
REST APIs model business entities as resources, each identified by a unique URL (Uniform Resource Locator). A customer might be represented at /customers/12345, their orders at /customers/12345/orders, and a specific order at /orders/67890. This hierarchical URL structure creates a navigable, predictable interface that developers can understand without extensive documentation.
Standard HTTP methods map to operations on these resources. GET retrieves a resource without modifying it. POST creates a new resource. PUT replaces a resource entirely with the provided data. PATCH applies partial updates to a resource. DELETE removes a resource. This consistent mapping means that developers who understand HTTP already understand the basic operations of any REST API.
Statelessness is a core REST constraint. Each request must contain all the information needed to process it — the server does not retain session state between requests. Authentication tokens, pagination parameters, and filter criteria are included with every request. This constraint enables horizontal scaling because any server instance can handle any request without shared session state.
Response formats are typically JSON, though REST does not mandate a specific format. HTTP status codes communicate the outcome of each request — 200 for success, 201 for resource creation, 400 for invalid input, 401 for authentication failure, 404 for missing resources, and 429 for rate limit exceeded. These standardized codes enable generic error handling in client applications.
REST has become the dominant API architecture for web services, with the vast majority of public APIs following REST conventions. This ubiquity means that developers can integrate REST APIs using any programming language, HTTP client library, or platform without learning proprietary protocols.
For API providers, REST's simplicity reduces documentation burden and support costs. A well-designed REST API is largely self-explanatory — resource names indicate what data is available, HTTP methods indicate what operations are possible, and standard status codes indicate what happened. This lowers the barrier to adoption for new consumers.
The stateless nature of REST APIs makes them inherently scalable. Without server-side session state, request routing is trivial — load balancers can distribute traffic across any number of server instances. This scalability is why REST dominates in cloud-native architectures where elastic scaling is a fundamental requirement.
All APIVult APIs follow REST conventions, providing a consistent and predictable integration experience. Whether you are screening entities with SanctionShield AI, validating data with DataForge, or analyzing contracts with LegalGuard AI, the interaction pattern is the same: standard HTTP methods, JSON payloads, and conventional status codes. This consistency reduces integration time across the APIVult product suite.