How to Manually test REST API’s?

How to Manually test REST API’s?

What is API?

API stands for Application Programming Interface. It is a software to software interface, not a user interface. With APIs, applications converse with each other with no client learning or intervention. It can be executed by composing capacity brings in the system.

API Workflow Example

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What is API Testing?

API testing utilizes programming to send calls to the API and get the yield. It testing regards the segment under test as a black box. The objective of API testing is to confirm right execution and blunder treatment of the part preceding its coordination into an application.

What are REST API?

REST: Representational State Transfer.

  • It’s an arrangement of functions on which the testers performs requests and receive responses. In REST API interactions are made via HTTP protocol.
  • REST also permits communication between computers with each other over a network.
  • For sending and receiving messages, it involves using HTTP methods, and it does not require a strict message definition, unlike Web services.
  • REST messages often accept the form either in form of XML, or JavaScript Object Notation (JSON).

Some Commonly Used API Methods:-

  1. GET: – It provides read-only access to a resource.
  2. POST: – It is used to create or update a new resource.
  3. PUT: – It is used to update or replace an existing resource or create a new resource.
  4. DELETE: – It is used to remove a resource.

REST API Inputs:-

GET POST PUT DELETE
Method – GET Method – POST Method – PUT Method – DELETE
URL URL URL URL
Custom-Header Custom-Header Custom-Header Custom-Header
Input JSON Input JSON Input JSON

 

Example:-

GET

                                                  Fig. :: GET method Example

                                     Post

                                                         Fig. :: POST method Example

HTTP Response Codes

Some HTTP response codes, which are often used with REST:-

200 OK: – This code indicates that the request was made successful.

201 Created: – This code indicates that request was successful and a resource was created and it validated the success of a PUT or POST request.

400 Bad Request: – This error code happens with POST and PUT requests when the data does not pass validation or the passed data is in the wrong format.

404 Not Found: – This code indicates that the required resource could not be found or not available.

401 Unauthorized: – This error code indicates that you need to provide authentication before accessing the resource.

405 Method Not Allowed: – Method Not Allowed error indicates that the requested HTTP method is not supported for this resource.

409 Conflict: – This code indicates that the user creates the same resource twice by which conflict occurs.

500 Internal Server Error: – Due to server-side issue this error code occurs.

Common Types of Tests and Bugs in API Testing

  • Delayed in API Response time
  • To verify when API doesn’t return any response data.
  • Response Data is not structured
  • Difficulty in connecting and getting response from API
  • Output response should be checked on the basis of provided input request.
  • Verification of the API whether it triggers some other event or request another API
  • Verification of the API whether it is updating any data structure

Advantages of API Testing

  • It is time effective.
  • It is language independent.
  • It is quite helpful in testing Core Functionality.
  • It helps us to reduce the testing cost.
  • It helps us to reduce the risks.

Challenges of API Testing

  • Parameter Combination, Parameter Selection, and Call Sequencing are three major challenges in API testing.
  • Due to absence of GUI it is quite difficult to provide input values.
  • Parameters selection and categorization required must be known to the tester.

 

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