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Home Articles

What is a Rest API? How they Work: A Guide

by Akhil M G
November 19, 2022
in Articles, Data Science and Machine Learning, Java Programming, React Native, Web and Android Development
What is a Rest API? How they Work:A Guide
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Table of Contents

  • What is REST API?
  • How Does REST API work?
  • The Six Rules of REST APIs
  • How to Use a REST API? 
  • REST API Examples
  • Conclusion

REST (Representational State Transfer) APIs, also known as RESTful APIs, are a type of design that is becoming more and more common. REST APIs are designed to benefit from already-existing protocols in a setting, most frequently over HTTP for a Web API. The REST API design is known for its enormous flexibility in enabling modern business connectivity and is more lightweight. Consider an online store without integrations. Your website would need to develop tools for handling user accounts, email automation, payment processing, shipping, and other tasks in addition to managing product listings. It would be more effective to outsource these duties to other services since this is not a scalable solution. Application programming interfaces, or APIs, are what software applications use to communicate with one another. APIs offer a standardized method for exchanging data between two applications. Through their respective APIs, your e-commerce site can communicate with shipping software, payment software, and any other required integrations.

Here’s our definition, then. The software can communicate over the internet using a set of rules called REST, which makes integrations straightforward and scalable. An API that adheres to these rules is known as a REST API (also known as a “RESTful” API). Representational State Transfer is referred to as REST. This indicates that the server sends back the resource’s current state in a uniform representation in response to a client request for a resource made using a REST API. To put it another way, REST APIs process requests for resources and respond with all pertinent information about the resource in a format that clients can easily understand (this format is determined by the API receiving requests). Additionally, clients can alter items on the server,

What is REST API?

Understanding what an API is first will help you describe a REST API definition the most frequently. Application programming interfaces, or APIs, are used to connect applications so they can work together to complete a designed task centered on data sharing and pre-defined process execution. In essence, it enables the communication between software applications. The two types of APIs that are most frequently used are REST APIs and Simple Object Access Protocol (SOAP) APIs. The request/response model is the foundation of the client-service architecture known as REST. REST APIs have grown in popularity as a component of the Web Services methodology. RESTful APIs are used by developers to send requests and receive responses using HTTP functions.

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How Does REST API work?

A REST API functions largely in the same way as a website. A client makes a call to a server, and the server responds with data using the HTTP protocol. It’s simple to demonstrate the similarities between a REST API call and the loading of a webpage using Facebook’s Graph API. Imagine someone wanted to access YouTube’s Facebook page, for instance. That person would type www.facebook.com/youtube into the address bar as usual. If that person had been a developer, they would have typed “graph.facebook.com/youtube” in place of “www,” and their browser would have sent an API request to Facebook, which would have been answered. When the request was answered, structured data arranged by key value parameters would be displayed. Using the YouTube page as an example, this structured data would show the number of likes, followers, and other metrics that the page had.

Parameters are another crucial idea in the world of REST APIs. Someone can get the ability to specify more specific search criteria when sending a REST API request. This filters the data that is received in response and modifies a request that contains key-value pairs. The data being worked with is a variable component of a resource that is specified by REST parameters. Path, query (the most popular type), header, and cookie are a few examples of various API parameter types. A path parameter is a movable component of a URL path that directs users to a particular resource within the data. At the very end of a URL, path are query parameters, which can be either mandatory or optional. As part of the HTTP protocol, header parameters are added.

A REST API’s endpoint is a specific URL that designates an individual or collection of data objects. The HTTP client interacts with data resources by directing requests to endpoints that are unique to each API request. A RESTful API request includes HTTP methods, which are described in more detail below. These commands correspond to the creation, reading, updating, and deletion of resources: GET, POST, PUSH, PATCH, and DELETE. Each and every REST API request has metadata, which is represented in REST headers. A REST header provides information about the request’s status as well as the format of the request and response.

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The Six Rules of REST APIs

The REST protocol has six requirements that APIs must adhere to in order to fully utilize its functionality. (Technically, only four are necessary and one is optional.) Each prerequisite establishes the framework for a quick and flexible API. A mechanism that allows one application or service to access a resource located within another application or service is the most basic definition of an API. The resource-containing application or service is known as the server, while the application or service performing the access is known as the client. Developers must adhere to a rigid framework when using some APIs, such as SOAP or XML-RPC. However, REST APIs can be created in almost any programming language and work with a wide range of data formats. The only prerequisite is that they adhere to the following six architectural constraints, also known as REST design principles:

1. Client-Server Separation

In a REST architecture, a client and server can only communicate by sending requests to one another and receiving responses from the other. All interactions are started by the client; neither servers nor clients can initiate requests or responses. RESTful APIs maintain the two conveniently independent by streamlining communication between clients and servers. In this way, server contents can be changed without unintentionally affecting clients, and client software can grow its builds without worrying about impacting any other servers.

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2. Uniform Interface

According to this rule, every request and every response must adhere to a standard protocol, or method of message formatting. The many different languages used to write applications and servers make it difficult for them to communicate with one another directly. Any client can communicate with any REST API using a uniform interface, which acts as a universal language. Translating requests and responses between software would be a complete mess without standardised communication. The information would become confused and lost due to small errors, and applications would need to update their request procedures whenever APIs changed theirs. This possibility is eliminated by a uniform interface.

This common language is HTTP, or Hyper-Text Transfer Protocol, for the majority of REST APIs. REST wasn’t designed with HTTP in mind. As a standard for applications that use it, REST has instead adopted this communication protocol. The client sends a request in a particular format that may look familiar to you in order to use HTTP with a REST API. For illustration, this is how a request for video data to the YouTube API looks: HTTP wasn’t created specifically for REST. Rather, REST adopted this communication protocol as the standard for applications that use it. To use HTTP with a REST API, the client sends a request in a specific format that might look familiar to you. For example, a request to the YouTube API for video data looks like this like all requests to a REST API, this request contains two pieces of information: GET is the HTTP method. This specifies the action the client wants to make on the resource. These four basic HTTP requests a client can make are

  • GET: To retrieve a resource.
  • POST: To create a new resource.
  • PUT: To edit or update an existing resource.
  • DELETE: To delete a resource.
  • HTTPS://… is the URL. The URL contains the uniform resource identifier, or URI, which specifies the target resource.

Because it is the location where the API actually communicates with the client, the URL in this situation is also referred to as an endpoint. The host replies with details about the target resource after receiving and validating the request. The data is typically sent back in JSON format, which stands for JavaScript Object Notation. JSON presents a resource’s entire content in a compact, easily readable format.

3. Stateless

With a REST API, all requests must be stateless. As a result, each request and response contains all the information needed to complete the interaction, making each interaction independent. The server doesn’t keep track of previous requests; it treats each one made by the client as a completely new request. Since the server does not need to perform any additional work to retrieve historical data, stateless transfers significantly reduce the amount of memory required for the server and increase the likelihood that a response will be successful. This guarantees the scalability of these interactions: Developers don’t have to be concerned about using significantly more memory or taxing the server as their software expands and makes more requests.

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4. Layered System

API requests as a straightforward client-server exchange, but this is oversimplifying a bit. Between these two organizations, there are typically more servers. These servers, or layers, are there to handle and distribute traffic, add security, and perform a variety of other crucial tasks. According to this principle, messages sent between a client and a target server must always be formatted and handled in the same way, regardless of the layers that exist in between. Client-server interactions shouldn’t be impacted by additional layers. Developers who adhere to this rule can change server systems without affecting the fundamental request-response process.

5. Cacheable

When a client visits a website, caching takes place when media is saved on the client’s device. The cached data is quickly loaded from local storage rather than being fetched again from the server when a client visits that site again. The majority of big websites use caching because it reduces page load times while conserving server space and bandwidth. Data caching is considered when developing REST APIs. The response a server sends to a client should state whether and how long the provided resource can be cached.

6. Code on Demand (Optional)

The last REST tenet is optional. An API’s response can, if desired, include computer code for clients to use. The client can now run the code in its own backend thanks to this. An API is deemed RESTful if it complies with this set of guidelines. These guidelines, however, give developers lots of freedom to modify the features of their API. REST APIs differ from the Simple Object Access Protocol, another popular web API technique, in that they are more flexible (SOAP).

REST is frequently contrasted with SOAP, another technique for creating HTTP-based applications. REST and SOAP differ primarily in that REST is a set of guidelines while SOAP is a protocol. APIs can be created using any method, including HTTP, URLs, and JSON, thanks to REST. Only XML is used by SOAP to send data. Because REST follows a less rigid structure and logic than SOAP and requires less coding to complete tasks, it is regarded as a simpler, more effective SOAP substitute. Furthermore, REST establishes guidelines for API design but leaves a lot of design decisions up to the developer creating the API.

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How to Use a REST API? 

Web applications with publicly accessible APIs will have documentation on their websites under the “developers” tab. You can find instructions on how to use the API with your own software here and access it. The documentation will most likely state whether the API was created using REST principles. To use many APIs, you need an API key. An API provider will give a developer an API key to authorize access to their API. An API key is a special string of characters. To identify the client to the server, API keys are frequently sent with client requests. Don’t share your API key(s). If the wrong people get hold of your key, they might use it to carry out some undesirable deeds in your name.

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REST API Examples

REST APIs are widely available on the internet; chances are, you’ve already used one without realizing it. Here are a few illustrations:

Twitter

The Twitter API enables the reading and writing of data by outside programs. Use it to read profiles, write and post tweets, and share tweets. This API works particularly well for downloading and reviewing a lot of tweets on particular subjects.

Instagram

Access to profile details, pictures, and videos is available through the Instagram Basic Display API. You can create apps that pull this user information and incorporate it into your own product using this API and others. For managing their online activities, professional Instagram accounts can access Instagram’s Graph API.

Spotify

Customers can request details about artists, songs, albums, and playlists on Spotify’s platform using its web API. Additionally, you can use it to shuffle songs, play and pause music, add songs to playlists, and do a lot more things.

HubSpot

All of HubSpot’s APIs are built in accordance with REST standards and intended for solid integrations that enable businesses to maximize the benefits of HubSpot’s tools. You can integrate your HubSpot account with other helpful tools and add advanced functionality to HubSpot’s robust marketing software.

Conclusion

REST APIs are widely expected to become the de facto standard for web-based communications in the near future, and for good reason. They make it possible for any two online applications, regardless of their capacities or sizes, to communicate and exchange data. A small startup can communicate with a large government organization using REST, and the reverse is also true. Any expanding online platform should want to be a part of the amazingly powerful and innovative systems that software tools can build when they collaborate.

In order to deliver data, capabilities, and services whenever (and wherever) they are required, APIs are essential. However, API design has changed to favor lighter, more flexible types that are ideal for mobile applications and geo-distributed networks. REST APIs continue to gain popularity for mobile apps, social networking sites, and a variety of other offerings as a result of this strategy. The adoption of REST APIs will continue to be one of the most effective ways to enable the next generation of business applications. REST APIs are used by thousands of businesses to drive revenue and expand their services. If you are interested to learn new coding skills, the Entri app will help you to acquire them very easily. Entri app is following a structural study plan so that the students can learn very easily. If you don’t have a coding background, it won’t be any problem. You can download the Entri app from the google play store and enroll in your favorite course.

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Akhil M G

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