chalk

Terminal string styling done right.

colors.js is currently the most popular string styling module, but it has serious deficiencies like extending String.prototype which causes all kinds of problems. Although there are other ones, they either do too much or not enough.

Chalk is a clean and focused alternative.

Why

• Doesn't extend String.prototype
• Expressive API
• Clean and focused
• Auto-detects color support
• Actively maintained

Install

Install with npm: npm install --save chalk

Example

Chalk comes with an easy to use composable API where you just chain the styles you want.

var chalk = require('chalk');

// style a string
console.log(chalk.blue('Hello world!'));

// combine styled and normal strings
console.log(chalk.blue('Hello'), 'World' + chalk.red('!'));

// compose multiple styles using the chainable API
console.log(chalk.blue.bgRed.bold('Hello world!'));

// nest styles
chalk.red('Hello', chalk.underline.bgBlue('world') + '!');

// pass in multiple arguments
console.log(chalk.blue('Hello', 'World!', 'Foo', 'bar', 'biz', 'baz')) 

You can easily define your own themes.

var chalk = require('chalk');
var error = chalk.bold.red;
console.log(error('Error!'));

API

chalk.<style>[.<style>...](string)

Chain styles and call the last one as a method with a string argument.

Multiple arguments are also supported. Chalk will add a space between each one.

chalk.enabled

Color support is automatically detected, but you can override it.

chalk.supportsColor

Detect whether the terminal supports color.

Can be overridden by the user with the flags --color and --no-color.

Used internally and handled for you, but exposed for convenience.

chalk.styles

Exposes the styles as ANSI escape codes.

var chalk = require('chalk');

console.log(chalk.styles.red);
//=> ['\x1b[31m', '\x1b[39m']

console.log(chalk.styles.red[0] + 'Hello' + chalk.styles.red[1]);
// first item is the style escape code and second is the reset escape code

chalk.stripColor(string)

Strip color from a string.

Styles

General

• reset
• bold
• italic
• underline
• inverse
• strikethrough

Text colors

• black
• red
• green
• yellow
• blue
• magenta
• cyan
• white
• gray

Background colors

• bgBlack
• bgRed
• bgGreen
• bgYellow
• bgBlue
• bgMagenta
• bgCyan
• bgWhite

License

MIT License • © Sindre Sorhus