api interview questions: 20 API Interview Questions and Answers To Ace the Interview


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    If you’re applying for a job that involves working with APIs, chances are there’s a good chance the interview will touch on this topic. That’s why it’s important to know what an API is and how it works.

    What is API?

    API stands for Application Programming Interface. It’s a set of functions and procedures that allow two applications to communicate with each other, usually over the internet. The first use of APIs was in 1966 when they were developed by Douglas Engelbart at Stanford Research Institute (SRI).

    APIs are used to access data from one application and then use it in another application, like pulling information from an online database into a spreadsheet app or displaying your Facebook photos on Instagram. They’re also used by developers to build apps that work together seamlessly–for example, if you want to share your location with someone through WhatsApp but also want them to receive an SMS message about where you are every 10 minutes until they arrive at your location; this kind of system would use multiple APIs working together seamlessly!

    What is an API?

    An API is a set of rules and specifications that allow two software applications to interact with each other. An API can be used to access data and functions from other applications, allowing you to build new features into your own application.

    APIs are especially popular in the tech world because they enable developers to create apps quickly without having to reinvent the wheel every time they want something new or different. If a developer wants their application to have access to photos from Instagram, for example, then they will use an existing Instagram API in order not only save time but also ensure that everything works smoothly when it comes time for users who download this particular app onto their devices (which could include iPhone or Android phones).

    Why do you need to know about APIs?

    API stands for “Application Programming Interface.” APIs are the glue between applications, allowing them to talk to each other. They’re what make the internet possible, and they’re also the foundation of modern software development.

    If you want to build a business or create new apps with your own unique twist on things, knowing how APIs work is essential!

    What are the various types of APIs?

    The four major types of APIs are RESTful, SOAP, RPC and XML-RPC. Each type has a specific set of characteristics that define how it works.

    • RESTful API: A RESTful API is an application programming interface that uses the principles of Representational State Transfer (REST). It makes use of HTTP verbs such as GET/POST/PUT/DELETE to communicate with other resources on the web server through data exchange. This type of API is commonly used in JavaScript frontend frameworks like AngularJS or ReactJS since they don’t require any special libraries for accessing data from a server anywhere on the Internet

    What is RESTful API?

    RESTful API is an architecture that defines a set of rules for communication between two or more systems. A RESTful API can be used to create and manage resources on the web, build web applications and integrate with other services.

    A RESTful service has four major characteristics: statelessness, uniform interface, cacheability, layered system

    What is SOAP API?

    SOAP is a protocol used to exchange structured information in the form of XML messages over a network. The SOAP specification defines how messages should be encoded into XML and then sent, as well as how they should be processed by servers.

    SOAP was designed to be independent of any particular programming language or operating system, but it does require that all implementations support HTTP and must use URIs for identifying resources.

    One significant difference between SOAP and RESTful web services is that SOAP uses RPC (Remote Procedure Call) whereas RESTful uses CRUD (Create Read Update Delete).

    What are the advantages and disadvantages of each type of API, SOAP and RESTful?

    • SOAP is more complicated to use than RESTful APIs.
    • RESTful APIs are easier to use because they’re simpler.
    • RESTful APIs are more flexible than SOAP-based ones because they don’t require you to know the format of your data in advance, which means that you can change how it looks without breaking any existing clients (or servers). This makes them ideal when you want to evolve your API over time while maintaining backward compatibility with older versions of it–for example, allowing new fields on an object or adding properties like timestamps or geolocation information as needed without having any negative impact on existing clients who don’t know anything about those changes yet but will be able to take advantage when they’re implemented by updating their code accordingly.*

    Are all RESTful APIs truly RESTful?

    A fully RESTful API is one that follows all of the principles of REST, and a partially RESTful API isn’t. The differences between a fully and partially RESTful API are:

    • There are no standards for how to implement an API. You can do it however you want as long as you follow the basic rules of HTTP, but some things (like status codes) will be different from one implementation to another
    • A fully RESTful system has more scalability than an equivalent system using other methods because it’s easy to add more servers without changing anything else in your system

    The main takeaway from this article is that you should be ready to answer some basic API interview questions. The best way to prepare for an interview is by doing mock interviews with your friends or family members and getting feedback on your performance. You can also sign up for online mock interviews where people will ask you questions and give their feedback on how well you did. This will help build up your confidence before going into the real thing!

    With this in mind, you should be able to answer any questions about APIs that your interviewer might throw at you. Remember, the most important thing is to make sure that your answers are clear and concise!

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