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What is console in JavaScript

What is console in JavaScript

The Console: Your Coding Sidekick

When you're starting to learn programming, it's like learning a foreign language. With this language though, your conversation partner is a computer. To communicate effectively, you need a tool to help you. In JavaScript, one of these tools is the console.

Think of the console like your coding diary or journal. It's a place where you can write down notes, ideas, or even whole sentences (in code form) and see what they mean in real life. If you're trying to solve a problem and you're not sure if your solution is correct, you can write it down in the console and it will tell you if you're right or wrong.

The Basics of Console

So how do you start using this magical tool? It's simple. If you've ever used a console in a video game to input cheat codes, think of this as something similar, but for programming.

Let's take a look at a simple example:

console.log("Hello, world!");

If you input this into your JavaScript console (which you can find in your browser's developer tools), it will output the message "Hello, world!". This is the most basic use of the console - outputting text.

Console's Functions

Beyond just outputting text, the console can do a whole lot more. It has several functions that can help you debug (find and fix errors) in your code.


We've just seen how console.log can output text. But it can also output code. For example:

let x = 5;

This will output the number 5. You can use console.log to output the results of any piece of code, which makes it a great tool for checking if your code is doing what you think it's doing.


If something goes wrong in your code, you can use console.error to alert yourself. Here's an example:

console.error("Something went wrong!");

This will output the message "Something went wrong!" in red, to make it stand out.


Similarly to console.error, console.warn is used to output warnings. The message will be output in yellow. Here's an example:

console.warn("This is a warning!");


If you have data in an array or an object, you can use console.table to display it in a nice, readable table. For example:

let people = [
  {name: "John", age: 30},
  {name: "Jane", age: 25}


This will output a table with the names and ages of John and Jane.


Finally, if your console is getting cluttered with too many log messages, you can use console.clear to clear it. Just type console.clear() and hit enter.

Why Use The Console?

So why should you use the console? As we've seen, it's a powerful tool for debugging your code. But it's also a great tool for learning. When you're starting to learn programming, you're going to write a lot of code that doesn't work the way you expect it to. By using the console to output your code, you can start to see why it's not working and how to fix it.

The console is also just a great place to play around and experiment with code. Because you can see the output of your code immediately, it's a great place to try out new ideas and see what happens.

The Console: Your Coding Playground

In conclusion, think of the console as a playground. It's a place where you can try out new things, make mistakes, and learn from them. So don't be afraid to get in there and start playing around. You might find that it's not just a useful tool, but also a fun one. Happy coding!