Error Alert: UnhandledPromiseRejectionWarning in Async Series Causes Concern

I am currently working on a function in my project that uses the async series method to ensure specific tasks are executed in a certain order. In this case, function1 needs to be completed before function2, which must then be completed before function3.

async.series([
function1 (function(err, customers) { stufftodo1; }),
function2 (function(err, customers) { stufftodo2; }),
function3 (function(err, customers) { stufftodo3; })
]);

However, I encountered an error while using an express node.js app and I am unsure how to resolve it:

(node:22888) UnhandledPromiseRejectionWarning: Error: expected a function
    at wrapAsync (/home/ubuntu/concept/node_modules/async/dist/async.js:198:50)
    at /home/ubuntu/concept/node_modules/async/dist/async.js:2952:13
    at replenish (/home/ubuntu/concept/node_modules/async/dist/async.js:444:21)
    at /home/ubuntu/concept/node_modules/async/dist/async.js:449:13
    at eachOfLimit$1 (/home/ubuntu/concept/node_modules/async/dist/async.js:475:34)
    at awaitable(eachOfLimit$1) (/home/ubuntu/concept/node_modules/async/dist/async.js:208:32)
    at eachOfSeries (/home/ubuntu/concept/node_modules/async/dist/async.js:662:16)
    at awaitable(eachOfSeries) (/home/ubuntu/concept/node_modules/async/dist/async.js:208:32)
    at /home/ubuntu/concept/node_modules/async/dist/async.js:2951:9
    at /home/ubuntu/concept/node_modules/async/dist/async.js:216:25
(node:22888) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
javascriptnode.jsexpressasynchronous

Answer №1

It appears that you may have overlooked the error and result handling function.

async.series([function1, function2], function(error, results) {});

Have you implemented the npm package:async in your codebase?

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Having trouble with the jQuery function not working as expected? Can't seem to identify any errors in the code?

I'm attempting to capture the essence of moving clouds from this beautiful theme: (I purchased it on themeforest, but it's originally designed for tumblr) Now, I want to incorporate it into my wordpress website here: The code used to be under ...

javascriptjquery

Exploring the connection between Jquery and Javascript event handling within ASP.NET C# code-behind, utilizing resources such as books and

It seems that Jquery, Javascript, and AJAX are gaining popularity now. I am interested in learning how to use this functionality within C#. Do you have any recommendations for resources or books that teach JavaScript from a C# perspective on the web? Not ...

c#javascriptjqueryasp.net

The image is experiencing difficulty loading from the Express static directory

Having some trouble with image loading... I've noticed that images are loading fine from the local folder, but not from the uploads folder which is set to be static. I've been attempting to upload a file from the browser. The upload and save pr ...

javascriptreactjsimageexpressfilepath

Encountering special symbols in the ID of a form element triggers an error message in jQuery validator, stating 'Unrecognized expression'

One of the challenges I am facing is that I have a form with elements that have ids containing special symbols. For example: The id="$FormData[1]$PersonData[1]$PhysicalPerson[1]$PersonName[1]$Affix[@type='qualification' and @position='prefi ...

javascriptjqueryjquery-validate

Error occurs during npm installation, causing the node_modules directory to vanish unexpectedly

Excuse me if my query seems out of place; I have recently taken over a website that utilizes grunt, npm, and other tools to manage its styling and scripting assets. This is not my usual area of expertise (I am primarily a software developer filling in unti ...

node.jsnpmgruntjs

Replace particular letters within the text with designated spans

Suppose I have this specific HTML code snippet: <div class="answers"> He<b>y</b> <span class='doesntmatter'>eve</span>ryone </div> Additionally, imagine I possess the subsequent array: ['correct' ...

javascriptjqueryhtml

Encountering SyntaxError due to Gulp-Sourcemaps and an unexpected token >

New to Gulp and npm here. I'm attempting to use gulp-sourcemaps, but I'm running into a crash when it reaches var sourcemaps = require('sourcemaps'). (The crash only happens when this line is included in the file) Here is my gulpfile: ...

node.jsnpmgulpgulp-sourcemaps

What is the best way to implement validation in a textarea to restrict the word count to a minimum of 250 and a maximum

I want to implement jQuery validation for a textarea field, with a requirement of 250 minimum words and 1000 maximum words. Additionally, I need to display the word count in a span tag next to the text area. How can I ensure that this validation works even ...

javascriptjqueryhtmlvalidation

TypeScript: "Implementing" methods. The organized approach

Currently, I am developing a middleware class for Express. Before delving into the details of the class, it's important to note that I will be injecting the middleware later by creating an instance of my "Authenticator" class and then using its method ...

typescriptclassexpressthisexecutioncontext

In what ways can you toggle the visibility of table rows and data dynamically with the onchange event in HTML?

I'm dealing with an HTML code that can dynamically change table data based on user selection. Here's the snippet of my HTML code: Select an option: <select name='set' id="set" class="selectpicker" onchange='displayFields(this. ...

javascriptjqueryhtml

What are some ways to track the loading progress of a JSON file retrieved through an Axios call?

To track progress accurately, I am contemplating implementing the following steps while making an axios call: Retrieve file size during the json file request Determine the percentage of downloaded file size from the network tab Currently, I only have a ...

javascriptaxios

React app experiencing inconsistent loading of Google Translate script

In my React application, I have integrated the Google Translate script to enable translation functionality. However, I am facing an issue where the translator dropdown does not consistently appear on every page visit. While it sometimes loads properly, oth ...

javascriptreactjsgoogle-translate

Verify the mining share in NodeJS prior to sending it to the pool (Stratum)

Struggling to verify if a share meets the minimum difficulty requirement. I have all the necessary data to generate a block hash and compare it with the difficulty level. However, my code is failing to produce a valid block hash, and I can't pinpoin ...

node.jscryptographybitcoinminingstratum

Creating a TypeScript shell command that can be installed globally and used portably

I am looking to create a command-line tool using TypeScript that can be accessed in the system's $PATH once installed. Here are my criteria: I should be able to run and test it from the project directory (e.g., yarn command, npm run command) It must ...

node.jstypescriptnpmyarnpkgts-node

Having trouble with findOneAndDelete in a MERN stack using Mongoose?

Hello Experts, I've been working on some code, but unfortunately it's not functioning properly and returning a null value. I suspect that the issue lies in my routes, although it works fine with other routes. Below is the backend code for deleti ...

node.jsreactjsmongodbexpressreact-redux

Troubleshooting the Hover Effect of Buttons in Next.js when Using Tailwind CSS for Dynamic Color Changes

Encountering a problem with button hover functionality in a Next.js component using Tailwind CSS. The objective is to alter the button's background color dynamically on hover based on a color value stored in the component's state. This code func ...

javascriptreactjstypescriptnext.jstailwind-css

Inform registered customers by utilizing AngularJS (angular-websocket-service) and Spring Boot to implement Websockets notifications

Exploring the world of AngularJS and FullStack development is an exciting journey for me. The architectural setup of my current app is already in place and ideally should not be altered (for security reasons). I've been able to send messages to the se ...

javascriptangularjswebsocketspring-bootspring-websocket

Updating AngularJS views based on window resizing

I've been working on an Angularjs application and everything is running smoothly, but I'm facing challenges when it comes to implementing a mobile version of the site. Simply using responsive styles won't cut it; I need to use different view ...

javascriptangularjsangular-ui-router

Executing a component's function from a JavaScript file

Is it possible in React to call a function or method of a component from a separate JS file in order to modify the component's state? Here are three example files: First, App.js import React,{Component} from 'react'; import Login from &ap ...

javascriptreactjscomponents

Displaying an element outside with reduced opacity using fabric js and controls placed above overlay

The property controlsAboveOverlay in Fabric.js is a boolean that, when set to true, will display the controls (borders, corners, etc.) of an object above the overlay image. The overlay image is an image that can be placed on top of the canvas. Currently, ...

javascripthtmlcssfabricjs