[SETTIMEOUT] node.js settimeout | settimeout javascript | example syntax

There is no difference between setTimeout in Node.js and setTimeout in regular JavaScript in the browser; they both function in the same way. The setTimeout function is part of the JavaScript language and is available in both environments.

Here's a summary of how setTimeout works:

Syntax: The basic syntax for setTimeout is the same in both Node.js and browser JavaScript environments.

setTimeout(callback, delay);

Usage: setTimeout allows you to schedule a callback function to be executed after a specified delay, expressed in milliseconds.

Functionality: The setTimeout function starts a timer when it is called. After the specified delay, the callback function is added to the event queue, and when the call stack is empty, the callback is executed.

Asynchronous: The callback function is executed asynchronously, meaning it won't block the main thread of execution. This is useful for handling time-consuming or non-blocking tasks.

Precise Timing: While setTimeout schedules the callback to run after the specified delay, the actual execution time might vary slightly due to the event loop's behavior and system load.

The key difference between Node.js and browser environments is the availability of certain APIs and objects. For example, in the browser, you have access to the DOM (Document Object Model), which allows you to interact with the webpage's structure and content. In Node.js, you have access to built-in modules like fs (file system) and http (for creating servers), which are not available in the browser.

setTimeout function works Node.js

In summary, the setTimeout function works the same way in both Node.js and browser environments, but the surrounding environment determines what other features and APIs are available for use in your code.

// Example 1: Basic usage of setTimeout

console.log("Start of the program");

setTimeout(() => {
  console.log("displayed after 2000 milliseconds");
}, 2000);

console.log("End of the program");


The first console.log() is executed immediately and logs "Start of the program."

Then, setTimeout() is called with a delay of 2000 milliseconds (2 seconds) and a callback function that logs "This message will be displayed after 2000 milliseconds (2 seconds)."

While the timer is counting down, the program proceeds to the next line and logs "End of the program."

After the specified delay (2 seconds), the callback function inside setTimeout() is executed, and it logs "This message will be displayed after 2000 milliseconds (2 seconds)."

Keep in mind that setTimeout() does not guarantee precise timing; the actual delay might be slightly longer due to the Node.js event loop's behavior. Additionally, when using setTimeout() in a real-world application, remember to handle errors and other aspects appropriately.

settimeout javascript example

<!DOCTYPE html>
  <title>setTimeout Example</title>
  <h1>JavaScript setTimeout Example</h1>
  <p id="message"></p>

    // Example 2: Using setTimeout to change the content of a paragraph after a delay

    // Get a reference to the paragraph element
    const messageParagraph = document.getElementById("message");

    // Set a timeout to change the content of the paragraph after
        3 seconds (3000 milliseconds)
    setTimeout(() => {
      messageParagraph.textContent = "The content of this paragraph has changed!";
    }, 3000);

Certainly! Here's another example of using setTimeout() in JavaScript, this time within the browser environment:

In this example, a paragraph element is defined with an empty text content initially. After a delay of 3 seconds (3000 milliseconds), the content of the paragraph is changed using setTimeout().


The browser will render the page with the "JavaScript setTimeout Example" heading and an empty paragraph with the specified ID.

After the page is rendered, the setTimeout() function is called. It schedules the callback function to be executed after 3000 milliseconds (3 seconds).

When the specified time elapses, the callback function is executed, and the content of the paragraph is updated to "The content of this paragraph has changed!"

Keep in mind that in the browser environment, setTimeout() is commonly used for tasks such as delaying UI updates, creating animations, or making HTTP requests with a delay. As with any asynchronous operation, ensure that you handle edge cases and potential errors appropriately.

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