Top JS console methods to know as a beginner!

Shivanshu Pareek — Fri, 16 Aug 2024 08:30:08 +0000

Hey guys, I just wanted to share some important JS console methods which helped be as a beginner in Javascript. Hope you find it helpful!

The Console API provides several methods to output messages, errors, and other information to the console. Here are some common methods you can use in the console:

console.log()

Outputs a message to the console. You can pass one or more arguments, which will be concatenated with a space in between.

Example:

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

console.error()

Outputs an error message to the console. Similar to console.log(), but with a red colour and an "Error" prefix.

Example:

console.error('Something went wrong!');
console.error(new Error('Invalid input'));

console.warn()

Outputs a warning message to the console. Similar to console.log(), but with a yellow colour and a "Warning" prefix.

Example:

console.warn('Deprecated function used!');
console.warn('Please update your code');

console.info()

Outputs an informational message to the console. Similar to console.log(), but with a blue colour and an "Info" prefix.

Example:

console.info('Application started');
console.info('Connected to database');

console.debug()

Outputs a debug message to the console. Similar to console.log(), but with a grey colour and a "Debug" prefix.

Note that this method is only available in some browsers and Node.js environments.

Example:

console.debug('Entering function foo()');
console.debug('Variable x has value:', x);

console.assert()

Outputs an error message to the console if the first argument is false. Useful for debugging and testing.

Example:

console.assert(typeof x === 'number', 'x must be a number');
console.assert(y > 0, 'y must be positive');

console.table()

Outputs a table with the provided data. In the below given example it will output the index, name & runs

Example:

const data = [
  { name: 'John', age: 30 },
  { name: 'Jane', age: 25 },
  { name: 'Bob', age: 40 },
];
console.table(data);

console.clear()

Clears the console.

Example:

console.clear();

console.count()

Outputs the number of times the console.count() method has been called with the same label.

Example:

console.count('loop iteration');
console.count('loop iteration');
console.count('another label');

console.group() & console.groupEnd()

The console.group() outputs a group set of console messages together, making it easier to read and debug.
The console.groupEnd() outputs the end of group set of console messages.

Example:

console.group('My group');
console.log('Message 1');
console.log('Message 2');
console.groupEnd();

console.time() & console.timeEnd()

Measures the time it takes to execute a block of code.

Note that console.timeEnd() is necessary since the measurement will not work without a start timer and a stop timer.

Example:

console.time('myTimer');
// some code here
console.timeEnd('myTimer');

console.trace()

Outputs a stack trace to the console

Example:

console.trace();

These are the most commonly used console methods. There are a few more, like console.dir() and console.dirxml(), but they're less frequently used.

Remember, the console is a powerful tool for debugging and testing your code. Use it wisely!

Thank you for your time, hope this was useful!

DEV Community: Shivanshu Pareek

Top JS console methods to know as a beginner!

console.log()

Example:

console.error()

Example:

console.warn()

Example:

console.info()

Example:

console.debug()

Example:

console.assert()

Example:

console.table()

Example:

console.clear()

Example:

console.count()

Example:

console.group() & console.groupEnd()

Example:

console.time() & console.timeEnd()

Example:

console.trace()

Example: