![]() ![]() The most common way to register and authenticate users is with their email or phone number. User Registration and Authentication: If you want users, you have to give people a way to use your chat app.So, let’s cover the core features of a chat app before diving into the deep end of functionality. Sequence Diagram for Chat Application Features and Functionality of a Chat AppĪs mentioned above, the implementation and functionality of those components will vary depending on the app’s intended use. The components can scale from an MVP chat app with basic capabilities to a full-blown, mature chat app like WhatsApp that has over two billion active users. While every chat app has a chat client and server, the size and functionality of those components will vary depending on the app’s intended use. Since key-value stores allow for easier horizontal scaling and low latency to access data, NoSQL databases like Cassandra are perfect for storing messages. You can even use a mix of both, using a reliable and robust relational database for generic data like profile settings and using a NoSQL database for the messages. Your choice of database, whether it’s a relational database or a NoSQL database (like MongoDB), relies heavily on your use cases, what’s important to your users, and what your development team is familiar with. Profiles, messages and media files need to be accessible at all times. Chat apps require both data storage and media storage. Of course, almost every mobile or web app requires some kind of data storage. This article talks about websockets in more detail Media Storage Real-time chat is the perfect use case for WebSockets. That means, the server can send data to the client without first getting a request. A WebSocket is a persistent connection between client and server that provides a bidirectional communication pathway. In a chat app, this quickly leads to inefficiencies since the client would have to poll the server every second for new messages. The server itself can’t push data to the client without the client first making a request. Typical communication between a client and server is done using HTTP and requires that the client makes a request for data from the server. ![]() WebSocket ServerĪ WebSocket server and client library are useful components for a chat app. This article talks about Chat APIs, their features and how they work in more detail. All these functionalities are built into CometChat’s SDKs and Chat APIs. For example, authentication, profile settings and notification settings can all be managed through a REST API. Chat Rest APIĪ Chat REST API is most often used to facilitate the functionality of the chat app outside of messaging. ![]() The chat server’s resources can include a REST API, a WebSocket server, an AWS instance for media storage, etc. This server, or pool of servers, is responsible for securely receiving a message, identifying the correct recipient, queuing the message and then forwarding the message to the recipient's chat client. The chat server is just that, a server (or usually many many servers) that hosts all the software, frameworks and databases necessary for the chat app to operate. When you type a message and hit send, the chat client transmits that message to the other major component: the chat server. Interactions include sending push notifications, displaying data to the user and storing messages and files. A desktop, web or smartphone chat application, the chat client is responsible for interacting with the operating system (i.e. The chat client is what the user experiences. ![]()
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