Name some of the API testing tools.

There are lots of API testing is available, the more tools are available in the market.

Some of them used in Salesforce:

1. Postman is a rest client that started off as a Chrome browser plugin but recently came out with native versions for both Mac and Windows.

At a high level, you can use it to send a post request to your web server and it gives you the response back. It allows you to set up all the headers and cookies your API expects, and then check the response when it comes back.

2.SoapUI 
SoapUI is a headless functional testing tool from SmartBear software. It comes in two flavors: Free open source version and Pro Version. Since the free version is open-source, you can actually gain access to the full source code and modify as needed.

3.Mockbin 
Mockbin was recommended by Augusto Marietti. Mockbin allows you to generate custom endpoints to test, mock, and track HTTP requests & responses between libraries, sockets, and APIs.

Thanks

Hi,

Here are some of the top API testing tools that can be used for Rest and Soap Web Service Testing.
Postman.
Karate DSL.
SoapUI.
HttpMaster Express.
Rest- Assured.
Rest Console.
RoboHydra Server.
Hippie-Swagger.

Thanks