Does react-native run in the background?

To make a CountDown Timer we will use CountDown component from react-native-countdown-component . Countdown Timer can be used if you are making an App which has some time constraints like if you are making a quiz App, You need some sort of timer to show the remaining time.

Instead, React Native uses Headless JS to execute JavaScript code in the background . In this article, we’ll learn to execute background operations in React Native using Native APIs and Headless JS. Headless JS is available only for Android, therefore, we’ll focus only on Android development in this article.

To use the same code both on Android and iOS use runBackgroundTimer() and stopBackgroundTimer() . There can be used only one background timer to keep code consistent.