Top REST API Interview Q&A

Building web APIs, micro-services, and other web services have become one of the basic business needs nowadays. And one of the most popular approaches to it is to use REST APIs. Of course, you can build some top-notch quality software using the best programming languages but when you are offering services, you are offering a package of such software applications or features built using a different programming language that works in sync to fulfill the requirements of the users. 

And to integrate this software, you have to use the REST API. of course you already know all of this. But delivering the same information when asked for or showing how it all works can be a little tough. And that’s why many developers tend to fail the interview. Although they are skilled enough, they don’t know what questions are going to be asked of them. Also, even if you know the answers, you are not sure about how to convey them.

REST API Interview Questions

1. What is a REST Resource?

A REST resource is a collection of resources that expose a defined set of operations (or methods) on an entity. The resources can be anything. They are usually organized into hierarchies, where each hierarchy represents an object with the same root and different “child” objects. These hierarchies are called “resources” in REST terminology because they represent items that may be accessed and manipulated by clients, such as web browsers or mobile app developers.

2. What are the features of RESTful Web Services?

The following are the features of RESTful Web Services:

• It is a uniform interface for accessing resources.
• A resource has properties and methods which can be identified by their names and definitions respectively.
• Support for Uniform Access to Resources Over Distributed Networks
• Hypertext-style Linking Using URLs (Uniform Resource Locators) between Resources
• Use of Hypertext Transfer Protocol (HTTP) for Inter-Resource Communication
• Separation of Concerns in Data Modeling – Use URIs to Represent Resources, Not Forms or RDFS Statements
• The representations that are sent in response to a request can be in various formats and media types such as text/plain, application/XML, or any other format or media type.
• The representation must be valid according to the HTTP protocol and syntax rules.
• The representation must be cacheable and include appropriate header information so that the user agent may use it when revalidating subsequent requests on the same resource.

3. What is the concept of statelessness in REST?

RESTful web services are defined as being stateless. They do not require any state to be saved between requests. Also, to function properly, they don’t need any data related to the client  This allows for a very lightweight and fast response time, which is important for mobile devices.

4. What are the HTTP Methods?

HTTP methods are the ways that you can send information from your web server to your application. There are many methods but the most popular ones include GET, POST, PUT and DELETE. 

GET requests to send a representation of some data back to the client or browser. This is what we mean by “GET”. POST requests do not return data; they create something on the server side and then return it as an entity. This is what we mean by “POST”. 

PUT requests are similar to POST requests in that they create something on the server side, but they allow you to modify an existing resource on the server side. This is what we mean by “PUT”. DELETE is used to delete something from the server.

5. What are HTTP Status codes?

Every HTTP request has been allocated status and a way of determining that status is called HTTP status codes. They are returned in the response header field, but they can also be used in other places. 

The most common HTTP status code is 2xx (indicating success), although this is not necessarily true for every case. For example, a 400 Error Code means that something went wrong on your server, while a 404 means that there was nothing at all on the page you requested. 

6. What do you understand about JAX-RS?

JAX-RS is a standard for building Java web services that can be used in multiple programming languages. It’s not just for Java, but also for JavaScript and other languages that run on the server.

JAX-RS defines a set of annotations that you can use to tag your classes and methods with information about how they should be invoked, how they should be marshaled to/from the request/response, and other details. These annotations are called JAX-RS annotations.

One of the main goals of JRS is to enable easy integration of existing Java EE applications with third-party libraries written in other languages like Javascript or Ruby.

7. What is URI?

A string of characters that identifies the resource on the web uniquely is known as URI. A URI can be thought of as a hyperlink, which points to some other resource on the internet. For example, in this article, http://www.example.com/search?q=computer is a URI that instructs browsers and search engines what web page you want to go to when you click on it.

A URI has three parts:

The scheme (e.g., “HTTP”) tells the browser how to interpret this URL. In this case, “HTTP” means that the browser should use HTTP (Hypertext Transfer Protocol) to request information from this server.

The hostname (e.g., “example.com”) provides information about the location of the server or domain where the resource lives (in this case).

The path (e.g., “/search”) tells the browser where in the directory hierarchy of this site you want it to look for this file (in this case).

Now the REST is up to you

The implementation of REST APIs is so common nowadays that even new developers are familiar with the concept. So it is a prerequisite that an experienced developer would already possess some insight into the matter. 

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What is REST API? An Overview | Liquid Web

What is REST?

The REST acronym is defined as a “REpresentational State Transfer” and is designed to take advantage of existing HTTP protocols when used for Web APIs. It is very flexible in that it is not tied to resources or methods and has the ability to handle different calls and data formats. Because REST API is not constrained to an XML format like SOAP, it can return multiple other formats depending on what is needed. If a service adheres to this style, it is considered a “RESTful” application. REST allows components to access and manage functions within another application.

REST was initially defined in a dissertation by Roy Fielding’s twenty years ago. He proposed these standards as an alternative to SOAP (The Simple Object Access Protocol is a simple standard for accessing objects and exchanging structured messages within a distributed computing environment). REST (or RESTful) defines the general rules used to regulate the interactions between web apps utilizing the HTTP protocol for CRUD (create, retrieve, update, delete) operations.

What is an API?

An API (or Application Programming Interface) provides a method of interaction between two systems.

What is a RESTful API?

A RESTful API (or application program interface) uses HTTP requests to GET, PUT, POST, and DELETE data following the REST standards. This allows two pieces of software to communicate with each other. In essence, REST API is a set of remote calls using standard methods to return data in a specific format.

The systems that interact in this manner can be very different. Each app may use a unique programming language, operating system, database, etc. So, how do we create a system that can easily communicate and understand other apps?? This is where the Rest API is used as an interaction system.

When using a RESTful API, we should determine in advance what resources we want to expose to the outside world. Typically, the RESTful API service is implemented, keeping the following ideas in mind:

• Format: There should be no restrictions on the data exchange format
• Implementation: REST is based entirely on HTTP
• Service Definition: Because REST is very flexible, API can be modified to ensure the application understands the request/response format.
• The RESTful API focuses on resources and how efficiently you perform operations with it using HTTP.

The features of the REST API design style state:

• Each entity must have a unique identifier.
• Standard methods should be used to read and modify data.
• It should provide support for different types of resources.
• The interactions should be stateless.

For REST to fit this model, we must adhere to the following rules:

• Client-Server Architecture: The interface is separate from the server-side data repository. This affords flexibility and the development of components independently of each other.
• Detachment: The client connections are not stored on the server between requests.
• Cacheability: It must be explicitly stated whether the client can store responses.
• Multi-level: The API should work whether it interacts directly with a server or through an additional layer, like a load balancer.

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An API-First Approach For Designing Restful APIs | Hacker Noon

I’ve been working with Restful APIs for some time now and one thing that I love to do is to talk about APIs.

So, today I will show you how to build an API using the API-First approach and Design First with OpenAPI Specification.

First thing first, if you don’t know what’s an API-First approach means, it would be nice you stop reading this and check the blog post that I wrote to the Farfetchs blog where I explain everything that you need to know to start an API using API-First.

Preparing the ground

Before you get your hands dirty, let’s prepare the ground and understand the use case that will be developed.

Tools

If you desire to reproduce the examples that will be shown here, you will need some of those items below.

• NodeJS
• OpenAPI Specification
• Text Editor (I’ll use VSCode)
• Command Line

Use Case

To keep easy to understand, let’s use the Todo List App, it is a very common concept beyond the software development community.

#api #rest-api #openai #api-first-development #api-design #apis #restful-apis #restful-api

Opencart REST API extensions - V3.x | Rest API Integration, Affiliate

Opencart REST API extensions - V3.x | Rest API Integration : OpenCart APIs is fully integrated with the OpenCart REST API. This is interact with your OpenCart site by sending and receiving data as JSON (JavaScript Object Notation) objects. Using the OpenCart REST API you can register the customers and purchasing the products and it provides data access to the content of OpenCart users like which is publicly accessible via the REST API. This APIs also provide the E-commerce Mobile Apps.

Opencart REST API 
OCRESTAPI Module allows the customer purchasing product from the website it just like E-commerce APIs its also available mobile version APIs.

Opencart Rest APIs List 
Customer Registration GET APIs.
Customer Registration POST APIs.
Customer Login GET APIs.
Customer Login POST APIs.
Checkout Confirm GET APIs.
Checkout Confirm POST APIs.

If you want to know Opencart REST API Any information, you can contact us at -
Skype: jks0586,
Email: letscmsdev@gmail.com,
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Download : https://www.opencart.com/index.php?route=marketplace/extension/info&extension_id=43174&filter_search=ocrest%20api
View Documentation : https://www.letscms.com/documents/api/opencart-rest-api.html
More Information : https://www.letscms.com/blog/Rest-API-Opencart
VEDIO : https://vimeo.com/682154292  

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Unilevel MLM Wordpress Rest API FrontEnd | UMW Rest API Woocommerce

Unilevel MLM Wordpress Rest API FrontEnd | UMW Rest API Woocommerce Price USA, Philippines : Our API’s handle the Unilevel MLM woo-commerce end user all functionalities like customer login/register. You can request any type of information which is listed below, our API will provide you managed results for your all frontend needs, which will be useful for your applications like Mobile App etc.
Business to Customer REST API for Unilevel MLM Woo-Commerce will empower your Woo-commerce site with the most powerful Unilevel MLM Woo-Commerce REST API, you will be able to get and send data to your marketplace from other mobile apps or websites using HTTP Rest API request.
Our plugin is used JWT authentication for the authorization process.

REST API Unilevel MLM Woo-commerce plugin contains following APIs.
User Login Rest API
User Register Rest API
User Join Rest API
Get User info Rest API
Get Affiliate URL Rest API 
Get Downlines list Rest API
Get Bank Details Rest API
Save Bank Details Rest API
Get Genealogy JSON Rest API
Get Total Earning Rest API
Get Current Balance Rest API
Get Payout Details Rest API
Get Payout List Rest API
Get Commissions List Rest API
Withdrawal Request Rest API
Get Withdrawal List Rest API

If you want to know more information and any queries regarding Unilevel MLM Rest API Woocommerce WordPress Plugin, you can contact our experts through 
Skype: jks0586, 
Mail: letscmsdev@gmail.com,
Website: www.letscms.com, www.mlmtrees.com,
Call/WhatsApp/WeChat: +91-9717478599.  

more information : https://www.mlmtrees.com/product/unilevel-mlm-woocommerce-rest-api-addon

Visit Documentation : https://letscms.com/documents/umw_apis/umw-apis-addon-documentation.html

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54% of Developers Cite Lack of Documentation as the Top Obstacle to Consuming APIs

Recently, I worked with my team at Postman to field the 2020 State of the API survey and report. We’re insanely grateful to the folks who participated—more than 13,500 developers and other professionals took the survey, helping make this the largest and most comprehensive survey in the industry. (Seriously folks, thank you!) Curious what we learned? Here are a few insights in areas that you might find interesting:

API Reliability

Whether internal, external, or partner, APIs are perceived as reliable—more than half of respondents stated that APIs do not break, stop working, or materially change specification often enough to matter. Respondents choosing the “not often enough to matter” option here came in at 55.8% for internal APIs, 60.4% for external APIs, and 61.2% for partner APIs.

Obstacles to Producing APIs

When asked about the biggest obstacles to producing APIs, lack of time is by far the leading obstacle, with 52.3% of respondents listing it. Lack of knowledge (36.4%) and people (35.1%) were the next highest.

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