Rest API Development Interview Questions

Checkout Vskills Interview questions with answers in REST API Development to prepare for your next job role. The questions are submitted by professionals to help you to prepare for the Interview.

Q.1 What do you understand by RESTful Web Services?
RESTful Web Services are basically REST Architecture based Web Services. In REST Architecture everything is a resource. RESTful web services are light weight, highly scalable and maintainable and are very commonly used to create APIs for web-based applications.
Q.2 What is a REST Resource?
REST architecture treats every content as a resource. These resources can be Text Files, Html Pages, Images, Videos or Dynamic Business Data. Resources are the basic building block of a RESTful service. Examples of a resource from an online book store application include a book, an order from a store, and a collection of users. Resources are addressable by URLs and HTTP methods can perform operations on resources.
Q.3 What REST stands for?
REST stands for representational state transfer. A REST API (also known as RESTful API) is an application programming interface (API or web API) that conforms to the constraints of REST architectural style and allows for interaction with RESTful web services. REST stands for representational state transfer and was created by computer scientist Roy Fielding.
Q.4 What are the REST constraints?
REST defines 6 architectural constraints which make any web service – a truly RESTful API and which are: Uniform interface, Client–server, Stateless, Cacheable, Layered system and Code on demand (optional)
Q.5 What is URI?
Similar to URL, URI (Uniform Resource Identifier) is also a string of characters that identifies a resource on the web either by using location, name or both. It allows uniform identification of the resources. A URI is additionally grouped as a locator, a name or both which suggests it can describe a URL, URN or both.
Q.6 What is the advantage of RESTful web services?
REST APIs provide a great deal of flexibility. Data is not tied to resources or methods, so REST can handle multiple types of calls, return different data formats and even change structurally with the correct implementation of hypermedia.
Q.7 Differentiate between REST API vs. SOAP?
SOAP is a protocol, whereas REST is an architectural style. An API is designed to expose certain aspects of an application's business logic on a server, and SOAP uses a service interface to do this while REST uses URIs.
Q.8 What is statelessness in REST?
As per the REST architecture, a RESTful Web Service should not keep a client state on the server. This restriction is called Statelessness. It is the responsibility of the client to pass its context to the server and then the server can store this context to process the client's further request.
Q.9 What is caching in REST API?
Caching is the ability to store copies of frequently accessed data in several places along the request-response path. Caches along the response path can take a copy of a response, but only if the caching metadata allows them to do so.
Q.10 What does stateful mean in REST?
Stateful means that it's holding the state on it's own (possibly in memory or local disk) that doesn't mean it can't backup the state in a database. Stateless means that it is depended only on 3rd party storage because it doesn't store any kind of state in memory.
Q.11 What is JAX-RS?
Jakarta RESTful Web Services or JAX-RS also called earlier as Java API for RESTful Web Services, is a Jakarta EE API specification that provides support in creating web services according to the Representational State Transfer (REST) architectural pattern.
Q.12 What are HTTP Status codes?
An HTTP status code is a message a website's server sends to the browser to indicate whether or not that request can be fulfilled. Status codes are set by the W3C and are embedded in the HTTP header of a page to tell the browser the result of its request.
Q.13 Which HTTP method equals create, under CRUD
The POST HTTP method equals create, under CRUD
Q.14 What does consistent resource naming conventions and URI formatting results in
Consistent resource naming conventions and URI formatting results in minimum ambiguity, maximum readability and maintainability
Q.15 What are the HTTP Methods?
The primary or most commonly-used HTTP methods are POST, GET, PUT, PATCH, and DELETE. These methods correspond to create, read, update, and delete (or CRUD) operations, respectively.
Q.16 List any disadvantages of RESTful web services
You can lose the ability to maintain state in REST, such as within sessions. It's important to understand what makes a REST API RESTful, and why these constraints exist before building your API.
Q.17 What do you understand by Messaging in terms of RESTful web services.
RESTful Web Services make use of HTTP protocols as a medium of communication between client and server. A client sends a message in form of a HTTP Request and the server responds in the form of an HTTP Response. This technique is termed as Messaging.
Q.18 What is rest message format?
A REST request is a simple HTTP request just like a regular browser would send to a web server. There is typically no XML request sent. A REST response is typically an XML document sent back in a regular HTTP response, just as if a browser had requested it.
Q.19 What is URI in Web service?
A Uniform Resource Identifier (URI) is a generic term for the names of all resources connected to the World Wide Web. URIs enable the protocols over the internet to conduct the interactions between and among resources.
Q.20 List best practices to develop RESTful web services
Few best practices for REST API design are: Accept and respond with JSON, Use nouns instead of verbs in endpoint paths, Name collections with plural nouns, Nesting resources for hierarchical objects, Handle errors gracefully and return standard error codes,
Q.21 What are Idempotent methods?
An idempotent method means that the result of a successful performed request is independent of the number of times it is executed.
Q.22 How Idempotent methods are relevant in RESTful web services domain?
Methods like GET, OPTIONS, TRACE, and HEAD are idempotent because they do not change the state of resources on the server.
Q.23 Differentiate between REST and AJAX.
The main difference between AJAX and REST is that, Ajax is a set of technologies. It is a method to dynamically update parts of the UI without having to reload the page. REST, on the other hand, is a type of software architecture. It is a method for users to request information from servers.
Q.24 How you keep yourself updated of new trends in REST API?
REST API and data science are seeing newer development every year and I update myself by attending industry seminars, conferences as available online or offline.
Q.25 How do you see yourself in next five year in REST API?
I foresee a bright future as I will gain more skills and knowledge in the domain of REST API and data science by adding new technologies as needed by my organization.
Q.26 What are your strengths as a REST API professional?
As a REST API professional I am having extensive experience in development of web services and web applications using. I also have the requisite managerial skills for managing team and achieve the assigned tasks.
Q.27 How do you prioritize REST API development related tasks?
REST API based development involves many tasks on a day to day basis. Tasks also need to be prioritized to accomplish the organizational goals as per the specified KPIs (key performance indicators). Prioritization of tasks is done on the basis of various factors like: the tasks relevance, urgency, cost involved and resource availability.
Q.28 How you manage your time for REST API related development?
REST API based development involves lots of tasks which need to be completed in a specific time frame. Hence time management is of utmost importance and is applied by: using to do lists, being aware of time wasters and optimizing work environment
Q.29 Why do you want the REST API job?
I want the REST API job as I am passionate about web service development and making companies more efficient by using REST API.
Q.30 What do you think of most important role of a REST API professional?
As a REST API development professional my focus is to provide the effective and efficient programs using REST API so as to fulfil the needs of the company.
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