If you’re someone dealing with APIs and involved in application/web development, WebSocket or REST API won’t sound alien to you. However, only a few have the clarity on what are sets them apart. Well, with this post, we attempt to make things clear for everyone who is using these two technologies regularly.
REST and WebSocket are two key technologies with which a developer deals regularly. Unless clarity on their differences and purposes isn’t attained, effective utilization isn’t possible. But before we delve deeper into the WebSocket API vs REST API, let’s understand the basic meaning of these two.
On a technical level, REST is nothing but a collection of design principles or policies referred to extensively during web application/service development. Only HTTP protocol-based web application development is assisted by REST.
As such HTTP-based communication is unidirectional mostly, the use of REST API makes data availability on-request possible. REST API will carry the information that you want to carry.
There are certain traits of REST-based operations.
For instance, they are stateless as well as standard. Every REST request will be created as per the HTTP verbs (GET, PUT, POST, and Delete).
Depending upon the verb used in the request creation, the REST request will process the data. Say a REST API features Delete verb then the data it carries will be deleted as the verb is telling it to do so. REST architecture allows independent deployment of the client and the servers.
WebSocket protocol, contrary to REST, is stateful while helping two applications in seamless data transmission or information exchange. It’s based on port & sockets and works only over a TCP connection. It supports bidirectional communication. By bidirectional, we mean that the same socket/port delivers and receive the data. Hence, a continuous connection is established.
Purposes of REST API usage
REST API exists to support the stateless communication. Such communication doesn’t demand continuous data delivery. Data is requested only when it’s required by the web application. You can compare the function of REST with the function of a vending machine. The vending machine won’t provide you with the goods unless you place a request. It works only when it’s given a command.
Purposes of Websocket usage
Extensively, WebSocket is used when an application demands ongoing or uninterrupted data delivery. For example, a chat application needs to receive the app all the time. Even if the end-user is not opening the app, the message should be delivered. Only WebSocket can enbale such continuous communication. In such unbroken data delivery, using REST will become resource-extensive whereas WebSocket simplifies the job.
What Sets WebSocket Apart from the REST?
Without much ado, let’s talk about the most concerning aspects of REST API vs WebSocket API i.e. how are they different:
Characteristics of WebSocket
Stateful and Bidirectional
Uses sockets and ports, so, is counted among low-level protocols.
Client and server are independently operational.
Widely used in the development of real-time applications;
Client-server data exchange or communication must take place on a unified TCP connection.
Only one communicating party (client/server) needs to be carrying out the communication.
Useful when there is heavy request traffic for an application/solution.
Requires a new TCP connection each time a request is made.
Connections can be horizontally.
High (in comparison)
As ports and sockets are involved, it is cost-effective
As REST is stateless, no logs, related to request, is saved or stored
Details like session and port details are used
Uses Request-Response communication model
Follows Full Duplex communication model
Each request needs new connection
Same connection is used throughout
Essential for every request
There is no need of overheads
Protect your REST APIs:
When is it appropriate to use REST and when is Websocket?
This discussion is not over with talking about differences. It’s crucial to understand that this comparison isn’t about which is best. It’s all about which is suitable. So, you need to find out the scenarios where REST is fitting and where WebSocket is suitable.
Well, we would suggest using REST when the data used is available on an ad-hoc basis. As REST is utterly diverse, every picked or used resource will be delivered. However, this isn’t a great choice to make when data should be delivered at blazing speed.
On contrary, WebSocket is great when the application you’re trying to develop should miss a single entry in the delivery. For instance, applications demanding tick data analysis. Wherever there is high load or request traffic, WebSocket is ideal.
Now, let’s talk about what should you not use WebSockets for.
You shouldn’t use WebSocket if you need both vertical and horizontal scaling as it only supports vertical scaling.
Whether you chose REST or WebSocket, one thing is certain your application will be able to communicate properly with other apps/software. You need to pick one based on your communication requirements and expectations. REST is far advanced and secured while WebSocket depends on lower-level components.
We hope that you know the differences between these two and can make a wise choice. Regardless of the choice, adopting stringent and robust API security is a must as it leads to secured data transmission and exchange. It ensures that only secured APIs are used and data transmitted isn’t in the reach of threat actors.
What is a REST API?
A REST API is an architectural style for building scalable, stateless web services. It is an approach for exchanging requests and responses between client and server, typically using HTTP. RESTful APIs typically use resource-based URLs and HTTP methods to interact with data.
What are the benefits of Websocket?
Websocket provides numerous benefits over traditional REST API communication, including bidirectional data flow, low-latency communication, smaller data payloads, reduced network overhead, and easier server scalability.
When should I use Websocket?
Websocket is typically used in real-time communication applications, such as chat applications, gaming, stock trading, and any other situations where a real-time connection is beneficial.
Can Websocket replace REST API?
"While some applications benefit from the real-time, low-latency communication offered by Websockets, many others require more robust, flexible communication protocols that can handle complex workflows and large data payloads. REST APIs remain a popular choice for these types of applications." Source