Understanding RESTful API Design: Principles, Examples, and Best Practices

Table Of Content

• Request and Response Formats
• Best Practices in API Design
• 1. Uniform Interface
• Foster sub-second end-to-end response times
• Design-First Approach

This REST API design constraint implies that the server can completely understand and fulfill the request every time. API model enforcement and standardization is at the heart of the model approach to designing RESTful APIs. These types of tools require a structured set of API definitions, using formats like Swagger, API Blueprint or RESTful API Modeling Language (RAML).

Request and Response Formats

Let's think about an endpoint where we need to receive JSON data from the client. The endpoint for creating or updating a workout needs data from the client. Returning all workouts is pretty simple and we don't have to do transformations because it's already a JSON file. We could name the creation endpoint /api/v1/workout because we'd like to add one workout, right? Basically there's nothing wrong with that approach – but this can lead to misunderstandings.

Best Practices in API Design

This is really useful for developers in general and people who want to work with our API, and very easy to set up as you can see. Now that we have our server up and running, tested, and connected to our front end app, the last step in our implementation will be to document our API. This means that a request first has to go through the first layer, then the second, then the third and so on.

1. Uniform Interface

Describe these error responses well, but keep them concise and neat. Provide enough information in the error codes for an end user to start work on fixing the cause, and, if you feel there’s more information needed, provide links to additional documentation. Swagger is a set of open-source tools that help developers build, document, and consume RESTful web services. It provides a user-friendly graphical interface for users to interact with an API and also generates client code for various programming languages to make API integration easier.

Foster sub-second end-to-end response times

Back in our server app, to implement Swagger we'll need two new dependencies. Each test checks whether the expected HTTP status code, response type, and response body are returned. If any of these expectations are not met, the test fails and provides an error message.

Taking a new look at security in RESTful API design - TechTarget

Taking a new look at security in RESTful API design.

Posted: Thu, 19 May 2016 07:00:00 GMT [source]

Error Handling and Status Codes

Chances are high that have we to implement CRUD endpoints for the records as well, because records should be added, updated or deleted in the future as well. Now you can go to your HTTP client, send the POST request again, and you should receive the newly created workout as JSON. Let's go into our workout service and receive the data inside our createNewWorkout method. Inside our service methods we'll be handling our business logic like transforming data structures and communicating with our Database Layer. It's also a good practice to name the service methods the same as the controller methods so that you have a connection between those. Let's create our service layer by implementing the next best practice.

This is because, with XML for example, it's often a bit of a hassle to decode and encode data – so XML isn’t widely supported by frameworks anymore. Any API (Application Programming Interface) that follows the REST design principle is said to be RESTful. You can think of the client as the front end and the server as the back end. API design is a highly iterative process that varies in duration according to the API's use case and requirements. Versioning is usually done with /v1/, /v2/, etc. added at the start of the API path. There are many kinds of caching solutions like Redis, in-memory caching, and more.

Get set up with LogRocket's modern error tracking in minutes:

The media type identifies a specification that defines how a representation is to be processed. REST is not a protocol or a standard, it is an architectural style. During the development phase, API developers can implement REST in a variety of ways. REST APIs should have different versions, so you don’t force clients (users) to migrate to new versions. This might even break the application if you're not careful.

Jump right back into our workout service and implement the logic for getAllWorkouts. One workout consists of an id, name, mode, equipment, exercises, createdAt, updatedAt, and trainerTips. Because of its standardization, API's should accept and respond with data in JSON format.

For simplicity’s sake, we will consider only two resources i.e. He works with companies large and small to help them capitalize on the opportunities provided by APIs, Microservices, and Digital Transformation. There are multiple approaches and debates when it comes to Rest API standards. But you should have a process to traverse your API project from requirement to design. Design itself is not pure science as it involves creative elements also. The process detailed here will help you convert your requirements to a design spec.

An organization that widely uses Microsoft technologies might opt to use Simple Object Access Protocol (SOAP), which supports the Web Services Description Language (WSDL). If you point your client application to a WSDL file, you can write code against the API almost as if it were a code library. For example, a REST API would use a GET request to retrieve a record. A PUT request updates a record, and a DELETE request deletes one. A well-designed REST API is similar to a website running in a web browser with built-in HTTP functionality.