🕸️Node JS
- It is a server-side platform built using Google Chrome’s JavaScript Engine (V8 Engine)
- It is an Open Source cross-platform runtime environment for developing server-side and networking applications.
- Over the Past decades, it become very Popular but It fails at some points
There are 3️⃣ types of error that you can Encounter :
1) 😵Syntax Error
-
This Occurs when we make any typo in the code
LIKE, Instead of
console.log(x)
you wroteconsle.log(x)
SOLUTION ⇒
To Avoid This type of Error you can use some
😄 Good Code Editor
Like ,- VS Code
- Atom
They Support all type of Programming Languages.
You can also Download
Code Linters
LikeESLint
. It will report syntax Errors , bad Indentations and undeclared Variables.
2) 😕Logic Error
- It Occurs when something doesn’t work as expected .
- This can be due to IN-Complete Logic
SOLUTION ⇒
Go through the Logic of your code and find what could be the Problem.
U can use the console.log
to find what the problem is ?
3) 🤕Run Time Error
- It occurs when the application is executed in real-time.
- often It’s hard to Replicate the same Error Again
It is very hard to spot the Error and sometime it takes very high time to solve the Error.
SOLUTION ⇒
To solve this type of Error we have to use the Debuggers , to Debug the code Line-by-Line.
There are various Debuggers Out there in the Market.
- Code Editors have their in-built Debugger
- Using the Chrome Browser to Debug
- ***Use a Third-Party Logging System [They are More Feature Rich ]*
1) Using Code-editor Debugger
Steps to start Debugging in the VS Code [or any other code Editor.]
- Open the
Index.js
File. - Open the
Run and Debug Panel
. - Set the
Breakpoint
. - Open the
Run and Debug
Button. - Choose
Node.js
environment.
After that a Debugger Toolbar appears at the top of the window.
- step over: Execute the next command but stay within the current function — do not jump into any function it calls
- step into: Execute the next command and jump into any function it calls
- step out: Continue processing to the end of the function and return to the calling command
- restart the application and debugger
- stop the application and debugger
2) Using Chrome Bowser to Debug
To debug the code in the browser , while starting the server instead of node index.js
type node --inspect index.js
or nodemon --inspect index.js
You can also use --inspect-brk
instead of --inspect
to halt processing (set a breakpoint) on the first line so you can step through the code from the start.
Open the chome://inspect
- Click on Configure and then add the port number , where the site is Running .
After that , Right-click on the browser[make sure you are on the app tab] and click on inspect . Inspect panel will open.
Go to the Source
Panel and then open the file by hitting ctrl + P and entering the filename [index.js]
Now you can use it as a debugger , click on Any line to set the Breakpoint , The Debugger will show up .
Now you can Debug Your Code.
3) Using Third-Party Logging System
Third-Party Logging System provides more features to debug and Maintain Your Code.
It is More Feature Rich and fast.
Some of the Third Party App.
ErrSole →
ERRSOLE - Fix Your Node.js Errors under 5 Minutes
Getting Starting Guide
Installation
npm install errsole
Usage
/**
* Put this Errsole code snippet at the top of your app's main file
*/
const errsole = require('errsole')
errsole.initialize({
framework: 'express',
token: '022b2784-cdc2-4072-94ce-6bf067a1809e'
})
// End of Errsole code snippet
Example
/**
- Put this Errsole code snippet at the top of your app's main file
*/
const errsole = require('errsole')
errsole.initialize({
framework: 'express',
token: '022b2784-cdc2-4072-94ce-6bf067a1809e'
})
// End of Errsole code snippet
/**
- Your app code starts here
*/
const express = require('express')
const app = express()
app.get('/', function (req, res) {
res.send('Hello World')
})
app.listen(3000)
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