What is API?

API stands for Application Programming Interface. It is defined how two pieces of software talk to eachother.

Types of APIs:

1) Web ( Rest, SOAP)

2) Platform (java, C++ etc)

Web APIs : We write for Software Developer Audience

Re : Representational

S: State

T: Transfer

It is design pattern not a protocol. Format of REST are JASON and XML 

SOAP

Before REST we had SOAP

SOAP: Simple Object Access Protocol

It only supports XML

It is a protocol not a design pattern.

To Understand difference between SOAP & REST

C: Create Resource Objets – POST

R: Retrieve Resource Objets- GET

U: Update Resource Objets – PUT

D:elete Resource Objets – DELETE

There are 3 ways that a data format can be specified:

Headers

Query Parameters

Suffix

Anatomy of a REQUEST

POST https://api.example.com/user?resource=device=ipad.

METHOD RESOURCE INFORMATION QUERY PARAMETER

Accept: application/json HEADER

Content_type:application/json

{ BODY

“name : “John Snow “

“email: snow.jon@doctoolss.com

}

CRUD METHOD

CREATE – PUT

RETRIEVE – GET

UPDATE – PUT

DELETE – DELETE

STATUS CODE

200 – OK

201 – CREATED

401 – UNAUTHORIZED

404 – NOT FOUND

403 – The no of API REQUEST per Month has been EXECUTED

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