Jaimin Bhavsar

Jaimin Bhavsar


Top 9 JavaScript Debugging Tools in 2020

Why are JavaScript Debugging tools important?

The number of web apps and websites that rely on or are built on JavaScript has continued to increase at a massive pace. JavaScript itself is the most popular language used in software development. Of course, with more powerful capabilities and complex codebases comes more errors.

Debugging these issues is a monumental challenge that every developer faces. Reproduction of bugs, potentially the most important part of the debugging process, is also notoriously difficult due to the variety of browsers and environments in which a bug occurs.

So what are some JavaScript debugging tools and strategies that you can implement to cut down on the amount of time you spend fixing bugs?

Server-side JavaScript debugging tools

While running JavaScript server-side is more of a recent occurrence, finding a debugging tool for server-side JavaScript is critical to maintaining application uptime. Luckily there are many backend logging and debugging tools which support JavaScript. Node.js itself has a number of debugging options like debugger.

Front-end JavaScript debugging tools

When it comes to debugging, the big difference between front-end issues and server side issues is that front-end issues are usually invisible to the developer. Server side errors can easily be logged to the server, whereas only the end-user will see a front-end bug. The normal flow when debugging a front-end JavaScript issue is:

  • User submits a bug to a support team or through a webform
  • The issue gets escalated to an engineer
  • The engineer tries to reproduce the bug
  • If the bug is found, the engineer will develop and push a fix
  • If the bug is not found, the engineer might reach out to the end user to send screenshots or get on a call. 

All in all, this is a cumbersome and time consuming process. A JavaScript debugging tool can help reduce the amount of time spent at each one of these stages. Here are some examples:

  • DevTools (or similar): This built-in browser functionality is the most basic and first step when attempting to validate or recreate a JavaScript bug. Using the console to view warnings, errors, and stracktraces gives insight into an error - if it is able to be reproduced. 
  • Browserstack (or similar): This group of tools helps a developer mimic the exact operating system and browser setup that a user had when they experienced a JS error. With millions of different browser + OS combinations, these are a must-have. 
  • JS Hint (or similar): these tools help prevent errors in the first place as well as ensure that a fix will work. They are extremely easy to use and help cut down on careless mistakes or syntax errors. 

If you work with JavaScript, you’ll know that it doesn’t always play nice. Thankfully, due to the plethora of JavaScript debugging tools available, troubleshooting is usually straightforward. This post outlines the best tools to help you find, diagnose, and fix problems.

Depending on your use-case, some tools might be better than others, but all will save you time in the debugging process.

1. Developer tools in modern web browsers

Every modern browser has tools available within it to debug code. Let’s take a look at some of the basic methods you might use to debug JavaScript using these browser tools, and then highlight each major browser and its dev tools in turn.

Outputting JavaScript debugging messages to the browser

One of the easiest ways to debug JavaScript has always been to output data to the browser. Here are the three main ways to do so:

Popping up messages with alert()

A tried and true method to debug JavaScript items, alert() will create a popup alert when your code meets a particular condition. The problem with alerts is that you end up with a series of popups. If you need more than one, they become unwieldy rather fast. This makes them more useful for a quick check of a value or to find out if a certain bit of code is executing, but not much more.

Logging lines to console with console.log()

Logging to the console is the norm for JavaScript debugging. Adding a console.log(‘foo’); line to your code will create a foo log entry in the JavaScript console of your respective dev tools set. This can be useful for a variety of reasons. For example, you can verify the value of a variable after you pass it to a method, or output the contents of an API response or results of a database query.

Pausing code execution with the debugger

The debugger; statement will pause code execution wherever you insert it in the code. The debugger statement will function as a breakpoint, pausing code execution. This allows you to investigate with the dev tools while the code is in a paused state.

Chrome Developer Tools

The Chrome Developer Tools are a quick way to debug your JavaScript code. You can open the Dev Tools to the Console tab by using the following shortcuts:



The Chrome Developer Tools are some of the best in the industry, and many developers trust these tools for their day-to-day debugging needs. Chrome Developer Tools include the standard JavaScript console, as well as tools for network and performance monitoring and security features. The majority of JavaScript debugging takes place in the Console and the Network activity tabs.

React Developer Tools for Chrome

If you work with React as well as with JavaScript, there is an extension available called React Developer Tools. This tool set adds a React tab to your dev tools window. The React tools allow you to inspect the contents of components. You can also view and edit their properties and state. The tools provide insight on the component which created the selected component, as well. If you use Chrome as your main development browser, and develop in React, it is well worth picking up this extension to make your React debugging easier.

Firefox Developer Tools

Firefox users in the past have relied on Firebug, an extension which gave Firefox users a set of competitive developer tools. The Firefox Developer Tools included in the latest versions of Firefox absorbed the functionality of Firebug. This brings the Firefox browser and its built-in tool suite on par with Google Chrome.

To find the Firefox Developer Tools, take a look in the Tools menu under Web Developer. There, you will find the JavaScript console, and many other useful items.

Safari Develop Menu

Users of Safari have to enable the Safari Develop Menu to gain access to Safari’s built in developer tools.

  • Go to the Safari tab and choose Preferences
  • Choose Advanced
  • Enable the option titled Show Develop menu in menu bar

Once you have followed the above steps, a Develop menu will appear in the toolbar. In the Develop menu, there are options to show the JavaScript Console, a debugger, a network traffic monitor, and an inspector for page elements. The Safari Dev Tools are comparable to the JavaScript debugging tools offered by Chrome. You can see the trend of improvement amongst the developer tools from all browsers, as they grow more capable of meeting the needs of developers.

Opera - Chromium Dev Tools

Previously, Opera’s built in developer tools suite was called Dragonfly. At one point it was a standalone project, then became a baked-in part of Opera, and included the standard dev tools items. It was particularly useful at remotely debugging another instance of Opera. After Opera 12, Opera began shipping with Chromium Dev Tools instead, which are opened and operated similarly to the standard Chrome Dev Tools described above.

Edge Developer Tools

Microsoft Edge is a modern browser that broke away from many of the preconceived negative views of Internet Explorer. As a result, Microsoft Edge includes an excellent dev tools package, which can be accessed via the same shortcut keys as the other options. These tools include a JavaScript console, as well as Network, Performance, and Memory tabs. More information about Edge dev tools can be found in the Microsoft Edge Developer Tools Guide.

2. The hackable debug tool - debugger

The Firefox dev tools team maintains a standalone tool dubbed simply “debugger” that you can use to debug in either Firefox or Chrome, and you can switch between them as necessary to ensure that your application is functioning correctly in both. If you are willing to set this node app up with just a few simple steps, you can use it in lieu of using the in-browser tools in either browser, and get the same exact experience and identical comparison in both. Pretty neat!

3. Node.js Inspector for debugging requests to Node apps

Debugging the Node.js on your application’s backend can be challenging. The following tools take advantage of the capabilities of the Node.js Inspector to assist you:

The Node Debug library for Node Inspector is a library can be included in your projects to assist you in implementing Node Inspector

Node.js V8 Inspector Manager is a Chrome extension which adds Node Inspector tools to the Dev Tools in Chrome

The Visual Studio Code editor allows for easy built-in Node Inspector usage

  • Click the Debug tab at the top
  • Choose Open Configurations
  • If none are set already, choose Node.js to start with
  • If you already have settings in the launch.json, you can hit Add Configuration to add the Node.js configuration

For more information on the various parameters and configurations that VS Code can use when debugging Node.js, check out the Node.js debugging documentation.

4. Postman for debugging requests and responses

A non-trivial amount of JavaScript development revolves around sending requests to APIs and receiving responses. These requests and responses are often in JSON format. Your application may need to conduct API requests for innumerable reasons, such as interacting with authentication servers, fetching calendars or news feeds, checking the weather, and countless others.

Postman is one of the best JavaScript debugging tools for troubleshooting the requests and responses in your application. Postman offers software for Windows, macOS, and Linux. With Postman, you can tweak requests, analyze responses, debug problems. Within the software, you can tailor clean transactions that you can then duplicate in your application.

Additionally, Postman has a feature called Collections. Collections allow you to save sets of requests and responses for your application or for an API. You save valuable time when collaborating with others or repeating the same testing tasks. When using Postman collections, you update the collection if necessary and then use it. This is much faster than repeatedly writing out every test.

5. ESLint

ESLint is a linter for JavaScript. Linters will analyze code as it is written and identify a variety of basic syntax problems. The use of ESLint will allow you to catch errors, particularly easy to resolve but annoying ones such as missing brackets or typos, before executing the code. ESLint is available as a Node package. It has also been set up as a plugin for many code editors such as Sublime Text 3 and VS Code, which will then mark the offending errors right in your editor window.

6. JS Bin

JS Bin is one of the best JavaScript debugging tools for collaborative debugging of your JavaScript. It allows you to test and debug scripts right along with other people. You can run the JavaScript, see a debug console and the output of the scripts, add libraries and dependencies, and so much more. Pro accounts can also take their code private, as well as other benefits.

One of the primary reasons you might consider using a tool like JS Bin is simplicity. In JS Bin, you can test the functionality of a small subset of your JavaScript in an isolated environment, without having to set an entire environment for it. When testing in JS Bin, you can be sure that your results aren’t tainted by conflicting scripts or styles from other parts of your application.

Another key feature of JS Bin is the immediate result you get from altering your JavaScript, HTML, or CSS. You can see your changes in real time. You can copy some code to JS Bin and have a working (or not working!) demo in no time. Then you are ready to debug it or share it.

7. JSON Formatter and Validator

It can be incredibly difficult to spot syntax errors or keys which have incorrect values when looking at unformatted JSON. If you have a condensed or minified JSON object, missing line returns, indentations, and spaces, it may be a challenge to read. You need to be able to quickly scan that object and check for errors in formatting or content.

To do that, you will expand the object and format it, wasting valuable time. The JSON Formatter & Validator relieves that pain point, so we’ve added it to this list of what I feel are the best JavaScript debugging tools. Postman automatically formats the object and allows you to easily validate both its JSON syntax as well as the actual content. You simply paste your JSON in, and it outputs the correctly formatted version. The tool will even automatically validate syntax to RFC standards, depending on which you select, if any.

8. Webpack

Webpack is a bundling tool used by developers for all manner of sites and applications. If you use Webpack to do your bundling, you have the advantage of the stats data available from the tool.

This data can range from module contents, build logs and errors, relationships that exist between modules, and much more. If you already use Webpack, this is an incredibly useful feature that sometimes gets overlooked. You can even use pre-built tools, such as the Webpack Analyse Web App, to visualize the stats that you generate from Webpack.

9. SessionStack

SessionStack is a monitoring software that provides you with a set of monitoring tools. These tools collect client-side data and assist you in figuring out exactly what your clients are doing on your website. In situations where problems occur, being able to track precisely what happened and how is vital.

This is where SessionStack shines. SessionStack uses a video replay to help developers replicate user issues and error conditions.

Tip: If you use both SessionStack and Raygun, you can attach SessionStack video replays to Raygun reports.

Conclusion on JavaScript debugging tools

JavaScript debugging can be a challenge, and having the right tools available to you can make or break the debugging process.

Every application and use case will be different, but learning about new tools will help you find out what your best options might be.

#javascript #web-development #webpack #json #eslint

What is GEEK

Buddha Community

Top 9 JavaScript Debugging Tools in 2020
Brain  Crist

Brain Crist


Citrix Bugs Allow Unauthenticated Code Injection, Data Theft

Multiple vulnerabilities in the Citrix Application Delivery Controller (ADC) and Gateway would allow code injection, information disclosure and denial of service, the networking vendor announced Tuesday. Four of the bugs are exploitable by an unauthenticated, remote attacker.

The Citrix products (formerly known as NetScaler ADC and Gateway) are used for application-aware traffic management and secure remote access, respectively, and are installed in at least 80,000 companies in 158 countries, according to a December assessment from Positive Technologies.

Other flaws announced Tuesday also affect Citrix SD-WAN WANOP appliances, models 4000-WO, 4100-WO, 5000-WO and 5100-WO.

Attacks on the management interface of the products could result in system compromise by an unauthenticated user on the management network; or system compromise through cross-site scripting (XSS). Attackers could also create a download link for the device which, if downloaded and then executed by an unauthenticated user on the management network, could result in the compromise of a local computer.

“Customers who have configured their systems in accordance with Citrix recommendations [i.e., to have this interface separated from the network and protected by a firewall] have significantly reduced their risk from attacks to the management interface,” according to the vendor.

Threat actors could also mount attacks on Virtual IPs (VIPs). VIPs, among other things, are used to provide users with a unique IP address for communicating with network resources for applications that do not allow multiple connections or users from the same IP address.

The VIP attacks include denial of service against either the Gateway or Authentication virtual servers by an unauthenticated user; or remote port scanning of the internal network by an authenticated Citrix Gateway user.

“Attackers can only discern whether a TLS connection is possible with the port and cannot communicate further with the end devices,” according to the critical Citrix advisory. “Customers who have not enabled either the Gateway or Authentication virtual servers are not at risk from attacks that are applicable to those servers. Other virtual servers e.g. load balancing and content switching virtual servers are not affected by these issues.”

A final vulnerability has been found in Citrix Gateway Plug-in for Linux that would allow a local logged-on user of a Linux system with that plug-in installed to elevate their privileges to an administrator account on that computer, the company said.

#vulnerabilities #adc #citrix #code injection #critical advisory #cve-2020-8187 #cve-2020-8190 #cve-2020-8191 #cve-2020-8193 #cve-2020-8194 #cve-2020-8195 #cve-2020-8196 #cve-2020-8197 #cve-2020-8198 #cve-2020-8199 #denial of service #gateway #information disclosure #patches #security advisory #security bugs

Hire Dedicated JavaScript Developers -Hire JavaScript Developers

It is said that a digital resource a business has must be interactive in nature, so the website or the business app should be interactive. How do you make the app interactive? With the use of JavaScript.

Does your business need an interactive website or app?

Hire Dedicated JavaScript Developer from WebClues Infotech as the developer we offer is highly skilled and expert in what they do. Our developers are collaborative in nature and work with complete transparency with the customers.

The technology used to develop the overall app by the developers from WebClues Infotech is at par with the latest available technology.

Get your business app with JavaScript

For more inquiry click here https://bit.ly/31eZyDZ

Book Free Interview: https://bit.ly/3dDShFg

#hire dedicated javascript developers #hire javascript developers #top javascript developers for hire #hire javascript developer #hire a freelancer for javascript developer #hire the best javascript developers

Aileen  Jacobs

Aileen Jacobs


What Is the Best Java Debugger?

Many people might think this a simple question; I am not one of them. I feel that in the modern world of development, there are too many factors to pick a single tool for debugging any language, let alone Java.

In The Beginning

Let’s take a step back and look at where we started with debugging, and while I am not going to get into the history of debugging, we should look at some of the basic tools used for debugging Java, aside from logging and system-out.


Let’s start with a quick look at the Java debugger (Java Discovery Protocol - JDP), which is a command-line tool used for debugging Java applications. This tool ships directly from Oracle, so you can be sure it will work; however, it can be complex to use and require knowledge of where you want to debug ahead of time.

A positive aspect of this tool is the fact that you can use it on the same box where the Java Virtual Machine (JVM) is running. This set-up means you do not need to deal with the complexities of connecting any external service that might be restricted by firewalls, which is particularly useful if you are deploying your Java applications into Docker containers. (which let’s be honest, who isn’t).

And while a command-line tool is not the best option for everyday work, what other options are available?

#java #performance #ide #debugging #debug #debuggers #debugging tools #debugging javascript

Rahul Jangid


What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");

How to comment JavaScript code?

  • For single line comment in JavaScript we have to use // (double slashes)
  • For multiple line comments we have to use / * – – * /
<script type="text/javascript">

//single line comment

/* document.write("Hello"); */


Advantages and Disadvantages of JavaScript

#javascript #javascript code #javascript hello world #what is javascript #who invented javascript

Gerhard  Brink

Gerhard Brink


Top 10 Big Data Tools for 2021!

In today’s tech world, data is everything. As the focus on data grows, it keeps multiplying by leaps and bounds each day. If earlier mounds of data were talked about in kilobytes and megabytes, today terabytes have become the base unit for organizational data. This coming in of big data has transformed paradigms of data storage, processing, and analytics.

Instead of only gathering and storing information that can offer crucial insights to meet short-term goals, an increasing number of enterprises are storing much larger amounts of data gathered from multiple resources across business processes. However, all this data is meaningless on its own. It can add value only when it is processed and analyzed the right way to draw point insights that can improve decision-making.

Processing and analyzing big data is not an easy task. If not handled correctly, big data can turn into an obstacle rather than an effective solution for businesses. Effective handling of big data management  requires to use of tools that can steer you toward tangible, substantial results. For that, you need a set of great big data tools that will not only solve this problem but also help you in producing substantial results.

Data storage tools, warehouses, and data lakes all play a crucial role in helping companies store and sort vast amounts of information. However, the true power of big data lies in its analytics. There are a host of big data tools in the market today to aid a business’ journey from gathering data to storing, processing, analyzing, and reporting it. Let’s take a closer look at some of the top big data tools that can help you inch closer to your goal of establishing data-driven decision-making and workflow processes.

Apache Hadoop

Apache Spark


Apache Storm

Apache Cassandra

#big data #big data tools #big data management #big data tool #top 10 big data tools for 2021! #top-big-data-tool