<h2 id="heading-introduction-to-api">Introduction to API</h2>
API --&gt; <code>Application Programming Interface</code> , is defined as a set of rules or protocols that are set to enable two software to communicate with each other. There are several types of API’s example <code>SOAP</code>, <code>XML-RPC</code> or <code>REST</code> This article will focus more on REST API.
Rest API stands for <code>REpresentational State Transfer</code>→ It is a set of functions (GET, POST, PUT ,Patch or Delete) that enables clients to perform <code>CRUD</code> operations that include <code>Create , Read, Update and Delete</code> resources in the data server.
There are Six REST API design principles.
<ul>
<li>Uniform interface
</li>
<li>Stateless
</li>
<li>Client-server decoupling
</li>
<li>Cacheable
</li>
<li>Code on Demand
</li>
<li>Layered System
</li>
</ul>
Rest API HTTP Methods
<ol>
<li>GET → Request Data from a server. The response contains all details requested.
</li>
<li>POST→Create new resources on the server.
</li>
<li>PUT→Update a Resource in the specified URL.
</li>
<li>Patch-&gt;Update a Resource in specific fields or properties of an existing resource.
</li>
<li>DELETE→Delete a Resource in the Specified URL.
</li>
</ol>

## Introduction to API

API --&gt; `Application Programming Interface` , is defined as a set of rules or protocols that are set to enable two software to communicate with each other. There are several types of API’s example `SOAP`, `XML-RPC` or `REST` This article will focus more on REST API.

Rest API stands for `REpresentational State Transfer`→ It is a set of functions (GET, POST, PUT ,Patch or Delete) that enables clients to perform `CRUD` operations that include `Create , Read, Update and Delete` resources in the data server.

There are Six REST API design principles.

* Uniform interface
    
* Stateless
    
* Client-server decoupling
    
* Cacheable
    
* Code on Demand
    
* Layered System
    

Rest API HTTP Methods

1. GET → Request Data from a server. The response contains all details requested.
    
2. POST→Create new resources on the server.
    
3. PUT→Update a Resource in the specified URL.
    
4. Patch-&gt;Update a Resource in specific fields or properties of an existing resource.
    
5. DELETE→Delete a Resource in the Specified URL.

REST APIs

Introduction to API