Console

`console.log`

Outputs a message to the console at the log level

Syntax

JavaScript

console.log(...data)

Parameters

Parameter	Type	Description
data	any[]	Zero or more objects to output

Return Value

undefined

Examples

Basic Usage

console.log('Hello, world!');
console.log('Count:', 42);
console.log({ name: 'Alice', age: 30 });

Practical Example

const items = [1, 2, 3];
console.log('Items:', items);
console.log('Length: %d', items.length);

Advanced Usage

console.log('%c Styled text', 'color: blue; font-size: 20px;');

Understanding console.log

The console.log method in JavaScript outputs a message to the console at the log level. It belongs to the console object and is one of the most widely used methods for working with console values in modern JavaScript and TypeScript applications.

The method signature is console.log(...data). It accepts 1 parameter: data. When called, it returns undefined. Understanding when and how to use log() helps you write more expressive, readable code.

Common use cases for console.log include data transformation, input validation, API response processing, and building reusable utility functions. It works well alongside related methods like console-error, console-warn, console-info, enabling you to chain operations together for complex data manipulation pipelines.

Browser support for console.log is excellent across all modern browsers including Chrome, Firefox, Safari, and Edge. It is also fully supported in Node.js and Deno. For older environments, transpilation with Babel or a polyfill may be needed.