Building a Real-Time Financial Dashboard: What Developers Can Learn From CNBC Live
I have always found real-time applications more interesting than static websites. There is something different about an application that keeps changing while you are looking at it. A stock price moves. A new headline appears. An economic announcement comes in. A chart changes without requiring a page refresh. That kind of experience looks simple from the user's side. For a developer, it can…
Developers often find real-time applications more captivating than static websites. The dynamic nature of real-time information, such as live stock prices, new headlines, and economic announcements, sets it apart. For developers, creating such an experience involves numerous challenges. One useful example to understand this concept is CNBC live, where financial coverage revolves around rapidly developing events.
When starting to build a real-time financial dashboard, developers should focus on the specific data the application needs to update. This includes market prices, company announcements, headlines, economic indicators, trading volume, currency information, and market status. These items do not necessarily require simultaneous updates. A stock price may change frequently, while an economic indicator could remain unchanged for hours.
Instead of treating all information as constantly changing, developers should design each type of information with an appropriate update strategy. This approach, inspired by live financial coverage, reveals that real-time does not mean instant updates for everything.
Older web applications frequently relied on polling, where the browser repeatedly asked the server for updates. However, frequent polling becomes inefficient when many users are connected and information changes rapidly. An event-based design offers a more efficient alternative. The browser waits for an event, validates the data, updates the database, and then pushes the update to connected clients without requiring a page refresh.
WebSockets provide a persistent connection between the browser and server, allowing the server to push updates directly to the client without waiting for another request. This approach is particularly useful when updates need to occur in both directions. However, if the application only requires occasional updates, HTTP requests or Server-Sent Events can also be considered.
A live dashboard should be lightweight for the browser. Developers sometimes focus on getting data into the application without considering the impact on performance. If hundreds of updates are received within a short period, the application should not unnecessarily redraw every component on the page. Modern frontend frameworks offer techniques to update only what has changed.
To provide context, financial applications can connect market information with related events. For instance, displaying a stock movement alongside relevant headlines, timestamps, and company information offers a more comprehensive view. Timestamps are crucial in real-time applications, as they help establish the sequence of events. Developers should consider time zones, server clocks, delayed data, and the difference between when an event occurs and when the application receives it.
Written by urgent.news from Dev.to's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
