An Oak application is most often used as a backend application in a client-server architecture whereas the client could be written in React.js or another popular frontend solution and the server could be written in Oak. Both entities result in a client-server architecture (frontend and backend relationship) whereas the backend would be needed for (A) business logic that shouldn’t be exposed as source code to the frontend application – otherwise it would be accessible in the browser – or for (B) establishing connections to third-party data sources (e.g. database(s)).
However, don’t mistake client application always for frontend and server application always for backend here. These terms cannot be exchanged that easily. Whereas a frontend application is usually something seen in the browser, a backend usually performs business logic that shouldn’t be exposed in a browser and often connects to a database as well.
Frontend -> Backend -> Database
But, in contrast, the terms client and server are a matter of perspective. A backend application (Backend 1) which consumes another backend application (Backend 2) becomes a client application (Backend 1) for the server application (Backend 2). However, the same backend application (Backend 1) is still the server for another client application which is the frontend application (Frontend).
Frontend -> Backend 1 -> Backend 2 -> Database // Frontend: Client of Backend 1 // Backend 1: Server for Frontend, also Client of Backend 2 // Backend 2: Server for Backend 1
If you want to answer the client-server question if someone asks you what role an entity plays in a client-server architecture, always ask yourself who (server) is serving whom (client) and who (client) consumes whom’s (backend) functionalities?
That’s the theory behind client-server architectures and how to relate to them. Let’s get more practical again. How do client and server applications communicate with each other? Over the years, there existed a few popular communication interfaces (APIs) between both entities. However, the most popular one is called REST defined in 2000 by Roy Fielding. It’s an architecture that leverages the HTTP protocol to enable communication between a client and a server application. A server application that offers a REST API is also called a RESTful server. Servers that don’t follow the REST architecture a 100% are rather called RESTish than RESTful. In the following, we are going to implement such REST API for our Oak server application, but first let’s get to know the tooling that enables us to interact with a REST API.
#deno #oak #rest #api #web-development
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.
An API (or Application Programming Interface) provides a method of interaction between two systems.
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:
The features of the REST API design style state:
For REST to fit this model, we must adhere to the following rules:
#tutorials #api #application #application programming interface #crud #http #json #programming #protocols #representational state transfer #rest #rest api #rest api graphql #rest api json #rest api xml #restful #soap #xml #yaml
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.
Before you get your hands dirty, let’s prepare the ground and understand the use case that will be developed.
If you desire to reproduce the examples that will be shown here, you will need some of those items below.
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
In this tutorial I will show you the fundamentals of designing a RESTful API specification by applying REST principles and best practices, then you’ll be ready to try my online tutorial: How to design a REST API with API Designer?
If you already know what is meant by API in the context of RESTful web services, you can skip to the next section. If not, read on.
The abbreviation API stands for Application Programming Interface this in itself, does not help us understand what it is, however in the context of web services, it can refer to one of two things:
In this post, I will use the first understanding of this term. Even though both are correct, the most technically relevant for this post is the first: an API is a contract for how software applications talk to each other.
The acronym REST stands for REpresentational State Transfer. It is an architectural style used to represent the transmission of data from one application component to another. In the context of web services, we are talking about the representation of resources (i.e. data) transferred over HTTP by calling a URI that represents the data and via an HTTP method that represents the action to perform against the given data.
RESTful API design is the activity of describing the behavior of a web service in terms of its data structures and the actions you allow other application components to perform on its data by the principles of REST. Those principles are covered later in this blog.
Imagine that you are an Architect (the kind the design building) and you set out to build an office block without a blueprint. You turn up on the first day with a truck full of bricks and some cement. What are the chances that you’ll be successful and build a structure that conforms to code and more importantly, doesn’t fall? It’s about zero. Without a blueprint the chance of failure is high.
The same approach applies to web service development. You need a blueprint, or more appropriately, an API specification. This is necessary to evaluate the API design and solicit feedback before even starting to build the implementation.
In addition to providing a specification for the web service’s development, an API contract serves to document its expected behavior, data types, and security requirements.
You should now be satisfied that API design is necessary for a RESTful web service, and should start to wonder how is the best approach to actually designing an API specification.
The tooling chosen by an API designer has substantial influence over the designer’s productivity. Highly productive tools such as the Anypoint API Designer from MuleSoft is perfect for designing APIs with OAS (swagger) or RAML.
#integration #api #rest #rest api #restful #api design #raml #rest api design
#api #rest api #asp.net api #restful api #api tutorial #consume api
#api #rest api #restful api #asp.net api #api tutorial #consume api