Console

`console.error`

Outputs an error message to the console, typically styled differently from standard log messages

Syntax

JavaScript

console.error(...data)

Parameters

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

Return Value

undefined

Examples

Basic Usage

console.error('Something went wrong!');
console.error('Error code:', 404);

Practical Example

try {
  throw new Error('Connection failed');
} catch (err) {
  console.error('Caught error:', err);
}

Advanced Usage

function assert(condition: boolean, msg: string) {
  if (!condition) console.error('Assertion failed:', msg);
}

Understanding console.error

The console.error method in JavaScript outputs an error message to the console, typically styled differently from standard log messages. 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.error(...data). It accepts 1 parameter: data. When called, it returns undefined. Understanding when and how to use error() helps you write more expressive, readable code.

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

Browser support for console.error 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.