REST

What is REST?

REST stands for Representational State Transfer and refers to an architectural style for distributed systems, described by Roy Fielding in his doctoral dissertation in 2000. REST itself is not a protocol, but a collection of principles that define how resources are addressed, retrieved, and modified over a network. In practice, REST builds on the HTTP protocol and uses its standard methods: GET for reading, POST for creating, PUT or PATCH for updating, and DELETE for removing records. Each resource – such as a storage location, an order, or an item master record – is identified by a unique URL.

A central feature is statelessness: every request contains all the information the server needs to process it. The server stores no session state between two requests. This facilitates horizontal scaling and makes the system more resilient to failures of individual components.

REST in intralogistics practice

In modern warehouse and transport environments, numerous systems communicate with one another: WMS, ERP, TMS, material flow systems, AutoStore controllers, pick-by-light controls, or cloud services for analytics. REST APIs have established themselves as the de facto standard for new interfaces, because they are lightweight, easy to document, and consumable with virtually any programming language.

Typical use cases in the warehouse include:

• Inventory queries from the ERP via the WMS
• Order transfer from the shop system to the WMS in e-commerce fulfillment
• Status feedback from conveyor control systems to higher-level supervisory systems
• Integration of carrier portals for shipping label printing and shipment tracking

Compared to traditional EDI connections or SOAP web services, REST scores points for simpler implementation and human-readable JSON responses. However, unlike SOAP, REST lacks binding standards for error codes, security tokens, or transaction behavior – these aspects are handled differently by each vendor.

What to look for when selecting and evaluating

When evaluating REST interfaces for a logistics project, the following points are critical: First, the quality of the API documentation – OpenAPI- or Swagger-compliant specifications significantly accelerate integration. Second, the versioning concept: how long are older API versions supported in parallel, and how will you be informed of breaking changes? Third, authentication: OAuth 2.0 and API keys are common, but not every vendor offers the same level of security. Fourth, rate limiting and availability SLAs, which are particularly relevant for time-critical warehouse operations. Finally, you should assess whether synchronous REST calls are sufficient for your use case, or whether event-driven patterns (webhooks, message brokers) are additionally necessary.