How to test Secure Restful API in katalon studio ?
What kind of security testing on API that you want to execute?
For example, there are many checklist items in security for APIs.
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[REST](http://en.wikipedia.org/wiki/Representational_state_transfer) (or **RE**presentational **S**tate **T**ransfer) is an architectural style first described in [Roy Fielding](https://en.wikipedia.org/wiki/Roy_Fielding)'s Ph.D. dissertation on [Architectural Styles and the Design of Network-based Software Architectures](https://www.ics.uci.edu/~fielding/pubs/dissertation/top.htm).
It evolved as Fielding wrote the HTTP/1.1 and URI specs and has been proven to be well-suited for developing distributed hypermedia applications. While REST is more widely applicable, it is most commonly used within the context of communicating with services via HTTP.
The key abstraction of information in REST is a resource. A REST API resource is identified by a URI, usually a HTTP URL. REST components use connectors to perform actions on a resource by using a representation to capture the current or intended state of the resource and transferring that representation.
The primary connector types are client and server, secondary connectors include cache, resolver and tunnel.
REST APIs are stateless. Stateful APIs do not adhere to the REST architectural style. State in the REST acronym refers to the state of the resource which the API accesses, not the state of a session within which the API is called. While there may be good reasons for building a stateful API, it is important to realize that managing sessions is complex and difficult to do securely.
Stateful services are out of scope of this Cheat Sheet: *Passing state from client to backend, while making the service technically stateless, is an anti-pattern that should also be avoided as it is prone to replay and impersonation attacks.*
In order to implement flows with REST APIs, resources are typically created, read, updated and deleted. For example, an ecommerce site may offer methods to create an empty shopping cart, to add items to the cart and to check out the cart. Each of these REST calls is stateless and the endpoint should check whether the caller is authorized to perform the requested operation.
Another key feature of REST applications is the use of standard HTTP verbs and error codes in the pursuit or removing unnecessary variation among different services.
Another key feature of REST applications is the use of [HATEOAS or Hypermedia As The Engine of Application State](https://en.wikipedia.org/wiki/HATEOAS). This provides REST applications a self-documenting nature making it easier for developers to interact with a REST service without a priori knowledge.
Automation (including Katalon) tools will able to run and check some of it by the specific input data (test payloads) and verify the response data or header, but it not good cover in terms of a security test.
I strongly recommend the security scanning tools like OWASP ZAP, Arachni in your case. If you need any help from these tools, you can contact me as well.