Overview of Debugging JavaScript in Chrome

As a new JavaScript programmer, Searching and correction of the bugs can be difficult. You can use built-in JavaScript functions for error correction through chrome. A simple example of finding and fixing errors in JavaScript is console.log() function that helps to get your code working correctly. Not Anymore!

This article is all approximately debugging the precise manner! You’ll learn how to use the Chrome Developer Tools to set up breakpoints and step-thru your code. This workflow is often a much greater green way to find and connect insects for your code. This academic suggests you a way to debug one particular issue, but the standard workflow you examine is useful for debugging all forms of JavaScript insects.

Debug the code through Breakpoints

In JavaScript code, you can easily find errors in chrome using different breakpoints. DevTools lets you pause your code within the middle of its execution, and examine the values of all variables at that second in time. The device for pausing your code is referred to as a breakpoint.

Let’s you break the code using on click function:


We add this function in any HTML tag and define it in JavaScript file or internal js.

  • Open the Chrome browser.
  • Shortcut key [ Control + Shift + I ] in chrome for both windows and Linux operating systems.
  • Click on Source option or menu in chrome browser.
  • Select Event Listener Breakpoints and open it. Now DevTools will expand event categories, Animations and clipboard.
  • Now check the mouse event option and open it.

You can check click checkbox.

Debugger Keyword in JavaScript

Similarly, breakpoints debugging you can also use debugger statement for stopping or breaking the JavaScript code.
JavaScript functions with debugger keyword.

function hello ( name ) {

let phrase = “ Hello , ${name}! ” ;

debugger ; // <– the debugger stops here

say ( phrase ) ;


That’s very handy whilst we’re in a code editor and don’t need to replace to the browser and appearance up the script in developer equipment to set the breakpoint with debugger keyword.

How to Debug JavaScript in Chrome Android

Previously, console logging becomes a pleasant alternative for debugging JavaScript on Android. These days with Chrome for Android faraway debugging, we’re capable to make use of all the goodness of the Chrome for Desktop Developer Tools on Android.

You also can navigate too approximately: debug inside the URL bar to prompt the debug menu and the JavaScript mistakes console with current Android devices. You need to see SHOW JAVASCRIPT CONSOLE at the top of the Browser. Currently in Android 4.0. Three (Ice Cream Sandwich), the logcat outputs to the browser channel

How do I debug JavaScript in chrome F12?

Press the F12 function key in the Chrome browser to launch the JavaScript debugger and then click “Scripts”. Choose the JavaScript file on top and place the breakpoint to the debugger for the JavaScript code. Ctrl + Shift + J opens Developer Tools.

How do I debug JavaScript line by line in Chrome?

2 Answers
  1. Hit the F12 key.
  2. Select the Scripts , or Sources , tab in the developer tools.
  3. Click the little folder icon in the top level.
  4. Select your JavaScript file.
  5. Add a breakpoint by clicking on the line number on the left (adds a little blue marker)
  6. Execute your JavaScript.

How do I debug a website in Chrome?

If you’re using Chrome and want to debug your site’s design, this browser already comes with a great built-in feature called Developer Tools.

Debugging Your Website with Chrome Developer Tools

  1. In your Chrome browser, open the site you want to debug.
  2. Right click over an element you want to debug.
  3. Click “Inspect”.

How do I debug a URL?

Debug URL
  1. Go to > SUPPORT > Diagnostic tools.
  2. Go to Debug URL.
  3. Enter target URL.
  4. Enter Edge server IP. If the URL you’re trying to debug is not using the secure protocol (HTTPS), then this field is optional.
  5. Optional: Add Request headers to change test conditions.
  6. Click Submit.

How do you debug?

How do I debug Google classroom?

Debugging access errors

If you get an access error using a Google testing tool: Check that your page is not protected by robots. txt or require a login. Try accessing your page from outside your firewall, on another computer, using Chrome in Incognito mode.

What is a debug console?

The Debug Console enables you to view the output and error messages. You can optionally make command prompt available.

How do I debug console?

To open the Debug Console, use the Debug Console action at the top of the Debug pane or use the View: Debug Console command (Ctrl+Shift+Y). Expressions are evaluated after you press Enter and the Debug Console REPL shows suggestions as you type.

What does debugging mean?

Definition: Debugging is the process of detecting and removing of existing and potential errors (also called as ‘bugs’) in a software code that can cause it to behave unexpectedly or crash. When the bug is fixed, then the software is ready to use.

Is debugging safe?

Of course, everything has a downside, and for USB Debugging, it’s security. The good news is that Google has a built-in safety net here: per-PC authorization for USB Debugging access. When you plug the Android device into a new PC, it will prompt you to approve a USB debugging connection.

How do I debug my phone from my computer?

Enable USB debugging on your Android phone
  1. Open the Settings app.
  2. Select System.
  3. Scroll to the bottom and select About phone.
  4. Scroll to the bottom and tap Build number 7 times.
  5. Return to the previous screen to find Developer options near the bottom.
  6. Scroll down and enable USB debugging.

How do I turn off debugging mode?

  1. Go to Settings and scroll to the System section (on Android 8 and above, go to Settings > System)
  2. Tap Developer Options.
  3. Tap the button to toggle developer options Off. USB Debugging is included in the Developer Options.

Is it safe to enable developer mode?

It never affects the performance of the device. Since android is open source developer domain it just provides permissions which are useful when you develop application. Some for example USB debugging, bug report shortcut etc. So no offense if you enable developer option.

What happens if developer mode is on?

Every Android smartphone and Android tablet contains a secret set of options: Android Developer Options. Android Developer Options allow you to enable debugging over USB, capture bug reports on to your Android device, and show CPU usage on screen to measure the impact of your software.

What happens if you turn on developer mode?

For the majority of people, however, Developer Mode has no real effect. It doesn’t make your device faster, it actively makes it less secure, and you can wipe your data accidentally. Just remember that if you are going to enable Developer Mode, it will wipe your Chromebook in the process.

What happens if you turn on developer options?

Every Android phone comes equipped with the ability to enable Developer options, which lets you test some features and access parts of the phone that are usually locked away. As you might expect, Developer options are cleverly hidden away by default, but it’s easy to enable if you know where to look.