What is API? Tutorial for Beginners on API and PostMan

What is API? Tutorial for Beginners on API and PostMan

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CRUD
Create - adding a new record into the db
Read - just to view public or private records
Update - find an existing record and make changes to it
Delete - find a record and remove for ever from the DB.


Request is made of few things (HTTP Protocol)
The endpoint URL … application
The method (action)
GET - Read
POST - Create a record
PUT and PATCH - Update
DELETE - Delete
Header
Data or Body (JSON … )
Example : https://reqres.in/
GET … list of users
URL : https://reqres.in/api/users?page=2
Method : GET
Response : HTTP Status Code [200 = ok or success … no problem]
Output data is list of users in JSON format
Example : PostMan



HTTP Status Codes
1xx : Information
2XX : Success … client (us) request is accepted and delivered successfully.
3xx : Redirection to another service.
4xx : Client Error
5xx : Server Error … server takes the blame.

PostMan
Tool that helps us achieve API programming/testing, easily.
Desktop App … download and instal.
https://www.postman.com/downloads/
Create Collection …
list of API requests that you have pre-programmed.
Execute them as a collection, one after the other.


Tomorrow’s Session.
XML, JSON
API Programming with Python, Java