There are two main methods for making your Node.js code “pause”: setTimeout and setInterval.Ī method called setTimeout runs a function or code block after a certain number of milliseconds. Introducing a delay between requests ensures that you stay within the API’s rate limit. If you exceed this limit, you’ll receive an error, and your code will fail. Many APIs have rate limiting in place, which means they will only allow a certain number of requests per second or minute. When making visual effects like animations, pausing the code is also essential because it lets the program wait for a certain amount of time before going on.Īnother reason to pause your code is to avoid overloading a remote API with too many requests. Additionally, it can pause the action at strategic points in the program. For example, it can be used to stop code execution to wait for certain tasks, like a network request, to finish. Pausing code in Node.js is an important concept, as it is used in various situations. We’ll look at the pros and cons of each method as well as how to use sleep in Node.js most effectively. This article will look at setTimeout and setInterval, two ways to make your Node.js code pause. The sleep function can be useful when you want to wait for an asynchronous task to finish or when you need to add a delay so that you don’t send too many requests to a remote API. However, in some cases, you should pause the execution of Node.js code. Node.js is a great choice for real-time web apps with many connections because it can handle multiple connections simultaneously with a single-threaded event loop. To use request with promises, install it like this: npm install requestĪnd then require("request-promise-native") in your code, like in the example has a JavaScript runtime environment, and developers can make scalable, high-performance server-side apps. Return new Promise(resolve => setTimeout(resolve, millis)) Ĭonst urls = await fetchUrls(INITIAL_URL) The sleep function is pretty straightforward: async function sleep(millis) millis - how long to sleep in milliseconds Much better, isn't it? Before I get into the details of how fetchPage() and fetchUrls() work, let's first answer your question of how to wait before fetching the next page. For instance, this would be your main function: const urls = await fetchUrls(INITIAL_URL) I am a big fan of the async library and I've used for a long time. Delaying multiple page fetches with async/await
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