WhatsApp is one of the most widely used messaging apps in the world, allowing users to send text, voice, and video messages to individuals and groups. One question that often arises is whether WhatsApp chat is written in JavaScript. In this article, we will explore the answer to this question and shed some light on the underlying technology of WhatsApp chat. Firstly, it is important to understand that WhatsApp is a cross-platform application, which means that it runs on multiple operating systems such as Android, iOS, and web browsers. Therefore, the technology used to build the app needs to be compatible with all of these platforms. To achieve this, WhatsApp uses a combination of programming languages and technologies, including JavaScript, to build its chat feature. JavaScript is a popular whatsapp mobile number list programming language that is widely used in web development. It is a client-side language, which means that it runs on the user's browser rather than the server. JavaScript is used to create dynamic and interactive web pages, and it can also be used to develop mobile applications. WhatsApp uses JavaScript in its chat feature to handle the user interface and the logic that drives the chat functionality. JavaScript is used to render the chat interface, which includes displaying messages, contact information, and chat settings. It is also used to handle user interactions, such as clicking on a chat message, opening a chat window, and sending a message. In addition to JavaScript, WhatsApp also uses other technologies such as HTML and CSS to create the chat interface. HTML is used to create the structure of the web page, while CSS is used to style the page and make it visually appealing. However, it is worth noting that JavaScript is not the only programming language used in the development of WhatsApp. WhatsApp's backend is built using a combination of Java, Erlang, and C++, which are used to handle the messaging functionality, including message encryption, message routing, and message delivery. In conclusion, WhatsApp chat is written using a combination of programming languages and technologies, including JavaScript. JavaScript is used to handle the user interface and the logic that drives the chat functionality, while other technologies such as HTML and CSS are used to create the chat interface.