This page introduces you to using and developing REST APIs for Atlassian applications.
Atlassian applications expose REST APIs that developers can use to access services of the Atlassian platform remotely. The REST APIs are presented by the platform components as well as any plugins that have implemented REST services.
The REST APIs provide an alternative to the Java APIs used by in-process plugins. The REST APIs provide greater change-tolerance than in-process APIs. Before starting a plugin project, it's a good idea to start by looking at the REST APIs, even if you are developing a plugin intended to operate in-process with the host application. Of course, it's also the best option for developing remote applications that access Atlassian platform services. JIRA Studio is one example of such an application.
To develop your own clients that use the Atlassian REST APIS, see the application-specific REST API documentation listed below. Also, the best place to get acquainted with the REST API available for use to a client application is by inspecting the target platform. Atlassian provides a tool for doing just that, the REST Application Browser (RAB). For information about the RAB, see Using the REST API Browser.
Use the REST module type to create plugin points in Atlassian applications, by exposing services and data entities as REST APIs.