RESTful web services can be tested using various tools like Postman, Swagger, etc. Postman provides a lot of features like sending requests to endpoints and show the response which can be converted to JSON or XML and also provides features to inspect request parameters like headers, query parameters, and also the response headers. Swagger also provides similar features like Postman and it provides the facility of documentation of the endpoints too. We can also use tools like Jmeter for performance and load testing of APIs.