REST API

What a REST API is

A REST API is an application programming interface that follows the REST style (Representational State Transfer) to let one piece of software request data or actions from another over the web. It exposes resources, such as users, orders or articles, each addressable by a URL, and lets clients act on them using standard HTTP methods. When your phone app loads your messages, or a website pulls products from a backend, a REST API is usually doing the talking behind the scenes.

How it works

REST maps actions to HTTP methods on resources. GET reads data, POST creates it, PUT or PATCH updates it, and DELETE removes it. A request goes to an endpoint URL such as /api/orders/42, and the server returns a response, most often as JSON, with a status code that says what happened: 200 for success, 201 for created, 404 for not found, 401 for unauthorized, and so on. Requests are stateless, meaning each one carries everything the server needs and the server keeps no memory of previous calls, which makes REST APIs simple to scale.

Key principles

Several ideas define the style. Resources are named with clear, noun-based URLs. HTTP methods carry the verb, so the URL stays a stable address. Responses use standard status codes so clients can react predictably. Authentication is usually handled with tokens or API keys sent in headers. And representations are decoupled from storage: the JSON a client receives is a view of the data, not the database itself. These conventions are why REST APIs from different providers feel familiar once you have used one.

REST, other API styles and webhooks

REST is the most common style but not the only one. GraphQL lets clients ask for exactly the fields they need in one request, useful for complex data. SOAP is an older, stricter protocol still found in enterprise systems. And webhooks are the inverse of a REST call: instead of your app asking the server for updates, the server calls your app when something happens. Most modern products combine a REST API for reading and writing data with webhooks for real-time events.

Common mistakes

Frequent pitfalls include ignoring status codes and returning 200 for everything, exposing sensitive data because endpoints are not properly secured, designing URLs around actions instead of resources, and not versioning the API so changes break existing clients. Poor pagination and missing rate limits also cause performance problems as usage grows.

REST APIs at BeBranded

Connecting systems through REST APIs is central to the web apps and automations we build. Whether we are wiring your website to a CRM, syncing a Webflow CMS with an external database, or building a custom web application, we consume and design REST APIs so your tools exchange data cleanly and securely. We handle authentication, error handling and versioning properly, so the integrations keep working as your stack evolves rather than breaking at the first change.