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  1. LogRocket Blog
    https://blog.logrocket.com/guide-promises-node-js

    A guide to promises in Node.js - LogRocket Blog

    • A promise is essentially an improvement of callbacks that manage all asynchronous data activities. A JavaScript promise represents an activity that will either be completed or declined. If the promise i… See more

    Creating A Custom Promise

    Promises are generally created by calling a Promiseconstructor, which accepts a single … See more

    LogRocket Blog
    Consuming A Promise

    In application development, it’s much more common to consume promises than it is to create promises. For example, when we request data from a server via an API that returns a pr… See more

    LogRocket Blog
    Chaining Promises

    Promises can be used to execute a series of asynchronous tasks in sequential order. Chaining multiple then() Promiseoutcomes helps avoid the need to code complicated nested func… See more

    LogRocket Blog
    Limitations in Promises

    Although Promise is a great tool for handling asynchronous operations in JavaScript, there are certain limitations or cases where alternative approaches like async/awai… See more

    LogRocket Blog
    The Node.Js Promisfy() Method

    Promisification refers to a transformation. It is the conversion of a callback-accepting function into a promise-returning function. Promisification aids in dealing with callback-ba… See more

    LogRocket Blog
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    Table of Contents
    Creating A Custom Promise
    Consuming A Promise
    Chaining Promises
    Limitations in Promises
    The Node.Js Promisfy() Method
     

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  2. 123

    Promises in Node.js represent the eventual completion or failure of an asynchronous operation and its resulting value. They are an alternative to callback functions for asynchronous code execution. A promise in Node.js is an object that may produce a single value in the future: either a resolved value or a reason that it's not resolved (e.g., a network error occurred).

    Code Example

    Here's a basic example of creating a promise in Node.js:

    let promise = new Promise(function(resolve, reject) {
    // "Producing Code" (May take some time)

    let isSuccessful = true; // just for demonstration

    if (isSuccessful) {
    resolve('The operation was successful.');
    } else {
    reject('The operation failed.');
    }
    });

    // "Consuming Code" (Must wait for a fulfilled Promise)
    promise.then(
    function(value) { console.log(value); }, // code if successful
    function(error) { console.log(error); } // code if some error
    );

    Explanation and Discussion

    Promises have three states:

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  3. GeeksForGeeks
    https://www.geeksforgeeks.org/promises-in-node-js

    Promises in Node.js - GeeksforGeeks

     
  4. Mozilla Developer
    https://developer.mozilla.org/.../Promise

    Promise - JavaScript | MDN - MDN Web Docs

  5. Mozilla Developer
    https://developer.mozilla.org/.../Guide/Using_promises

    Using promises - JavaScript | MDN - MDN Web Docs

  6. Stack Abuse
    https://stackabuse.com/promises-in-node-js

    Promises in Node.js - Stack Abuse

  7. DEV Community
    https://dev.to/logrocket/guide-to-promises-in-nodejs-n8m

    Guide to promises in Node.js - DEV Community

  8. bytescrum.com
    https://blog.bytescrum.com/understandin…

    Understanding Promises in Node.js: A …

    WEBJul 3, 2024 · Promises are a powerful feature in Node.js, providing a cleaner and more intuitive way to handle asynchronous operations. Understanding promises can significantly improve the readability and …

  9. The Modern JavaScript Tutorial
    https://javascript.info/promise-basics

    Promise - The Modern JavaScript Tutorial

  10. Mozilla Developer
    https://developer.mozilla.org/.../Promises

    How to use promises - Learn web development | MDN - MDN …

  11. Scaler
    https://www.scaler.com/topics/promises-in-node-js

    Promises in Node.js - Scaler Topics

  12. heynode.com
    https://heynode.com/tutorial/what-are-promises

    Understanding Promises in Node.js - heynode.com

  13. Twilio
    https://www.twilio.com/en-us/blog/asynchronous...

    Asynchronous JavaScript: Using Promises With REST APIs in …

  14. Guru99
    https://www.guru99.com/node-js-promise-generator-event.html

    Node.js Promise Tutorial - Guru99

  15. Medium
    https://medium.com/dev-bits/writing-neat...

    Writing neat asynchronous Node JS code with Promises

  16. Stack Overflow
    https://stackoverflow.com/questions/4296505

    javascript - Understanding promises in Node.js - Stack Overflow

    Node.js promise request return - Stack OverflowDec 31, 2016
    node.js - nodejs - How to promisify http.request? reject got called two ...Jul 22, 2016
    node.js - fs.writeFile in a promise, asynchronous-synchronous stuff ...Aug 12, 2015
    What is the best way to limit concurrency when using ES6's Promise.all()?
    See more results
  17. W3School
    https://www.w3schools.com/Js/js_promise.asp

    JavaScript Promises - W3Schools

  18. Intuz
    https://www.intuz.com/blog/promises-in-node-js-with-examples

    A guide to Node JS Promises with Examples - intuz.com

  19. FreeCodecamp
    https://www.freecodecamp.org/news/javascript...

    How to Use JavaScript Promises – Callbacks, Async/Await, and …

  20. FreeCodecamp
    https://www.freecodecamp.org/news/javascript...

    JavaScript Promise Tutorial – How to Resolve or Reject Promises …

  21. Mastering JS
    https://masteringjs.io/tutorials/node/promisify

    The `util.promisify()` Function in Node.js - Mastering JS

  22. Mozilla Developer
    https://developer.mozilla.org/en-US/docs/Learn/...

    How to implement a promise-based API - Learn web …

  23. Stack Overflow
    https://stackoverflow.com/questions/34628305

    node.js - Using Promises with fs.readFile in a loop - Stack Overflow