API Testing Using Postman: Part 2

•  API helps to communicate between two different applications and also which are coded in 2 different languages.
• For example, Google developed maps that contain open-source APIs. Maps are not only used by Google but also by different applications such as whatsapp, FB, snap etc.

• API vs Webservice: API is a request which will be developed offline without using of public server and Webservice is also an API but it is deployed in the server and made available for the public.
• All Webservices are API but all APIs are not Webservices.
• An API is called a Webservice when an API is deployed in a public server and makes it available for everyone.

Two Types of API:

1. Simple Object Access Protocol(SOAP). (XML format)
2. REST(Representational State Transfer). (JSON, XML, etc.)

• SOAP is a very old tool and it is difficult to understand the request and response sometimes.
• Currently, we are using REST services. we have 4 major commands to request or to get the response.

1. GET - used to get the requested info from the Database.
2. POST - used to create a new item in DB.
3. PUT - used to update the existing item in DB.
4. DELETE - used to delete existing items from DB.