JavaScript Console Commands Every JavaScript Developer Should Know

JavaScript Console Commands Every JavaScript Developer Should Know
September 13, 2023

As a budding JavaScript developer, the web browser's console is your best friend. It's not just a place to see error messages. It's also a powerful tool for debugging, understanding your code, and even running JavaScript on-the-fly.

In this article, we'll go over some of the most useful console commands that can make your life as a developer easier and more productive.

Whether you’re just starting out or you’ve been coding for years, these commands are essential for efficient JavaScript development.

1. console.log() - The Basics

Real-world use case: You’re writing a function, and you’re unsure if it's executing or what it's returning. By using console.log(), you can see the output of your code and understand its behavior.

What it does: Prints a message to the console.


let name = "Alice";
console.log(name);  // Output: Alice

2. console.error() - Highlighting Errors

Real-world use case: You're troubleshooting a part of your application that isn't behaving as expected. By logging an error, you can get a standout message that's easy to spot in the console.

What it does: Displays an error message to the console.


console.error("This is an error message!");  // Displays the error message with a red icon.

3. console.table() - Tabular Data Display

Real-world use case: You have an array or an object and you want to view its content in a structured table format. This is especially helpful when dealing with long lists of data.

What it does: Displays data in a table format.


let users = [
    { name: "Alice", age: 28 },
    { name: "Bob", age: 22 }

4. and console.groupEnd() - Organizing Logs

Real-world use case: You have several log statements and you want to group them together to make your console output cleaner and more organized.

What it does: Groups related logging statements together.

Code:"User Details");
console.log("Name: Alice");
console.log("Age: 28");
console.groupEnd();"Purchase History");
console.log("Product: Laptop");
console.log("Price: $1200");

5. console.assert() - Conditional Logging

Real-world use case: You want to log a message only if a certain condition is false. This can be useful for debugging and ensuring specific conditions are met in your code.

What it does: Logs a message if the provided assertion is false.


let age = 15;
console.assert(age >= 18, "User is not an adult!");  // This will log the message since age is not >= 18.

6. console.clear() - Cleaning Up

Real-world use case: Your console is cluttered with numerous logs, and you want a fresh view.

What it does: Clears the console.


console.clear();  // This will clear all previous logs in the console.

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