ansis

Colorize text in terminal or console output with ANSI colors & styles

  • ansis

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Readme

<a href="https://www.npmjs.com/package/ansis">
  <img width="323" src="docs/img/ansis-logo.png" alt="ansis"><br>
  ANSI Styling
</a>
The Node.js library for formatting Terminal and Console output with ANSI colors & styles

npm node Test codecov node
Ansis is a smaller and faster alternative to Chalkchalk with additional useful features and clean syntax.\ For example:
green`Succeful!`
red`Error!`
black.bgYellow`Warning!`
hex('#E0115F').bold.underline('Hello World!')

Why yet one lib?\ See the features comparison and benchmarks of most popular Node.js libraries:\ chalkchalk, colors.jscolors.js, colorettecolorette, picocolorspicocolors, kleurkleur, ansi-colorsansi-colors, cli-colorcli-color, colors-clicolors-cli.

Open in StackBlitz

πŸ’‘ Highlights

  • Supports both ESM and CommonJS
  • Supports TypeScript
  • Supports Bun, Deno, Next.JS runtimes
  • Standard API compatible with Chalk, switch from Chalk to Ansis without changing your code
```diff - import chalk from 'chalk'; + import chalk, { red } from 'ansis';
chalk.red.bold('Error!'); // <- the Chalk like syntax works fine red.bold('Error!'); // <- the same result with Ansis red.boldError!; // <- the same result with Ansis ```
  • Default import
- ESM: import ansis from 'ansis' - CJS: const ansis = require('ansis') - ESM: import { red, green, bold, underline } from 'ansis' - CJS: const { red, green, bold, underline } = require('ansis')
  • Chained syntax red.bold.underline('text')
  • Nested template strings `` greenGREEN text ${redRED text} GREEN text `
  • [ANSI 256 colors](#256-colors) and [Truecolor](#truecolor) (**RGB**, **HEX**) ` rgb(224, 17, 95)Ruby `, ` hex('#96C')Amethyst ``
  • Extending of base colors with named truecolors
  • ANSI codes as open and close properties `` Hello ${red.open}World${red.close}! `
  • [Strip ANSI codes](#strip) method ansis.strip()
  • [Correct style break](#new-line) at the end of line when used \n` in string
  • Supports environment variables NO_COLOR FORCE_COLOR and flags --no-color --color
  • Auto detects color support
  • Up to x3 faster than Chalk, see benchmarks and only 3 KB dist code
  • Doesn't extend String.prototype
  • Zero dependencies

❓Question / Feature Request / Bug

If you have discovered a bug or have a feature suggestion, feel free to create an issue on GitHub.

Install

npm install ansis

Usage

You can import default module or named colors with ESM or CommonJS syntax.
// ESM default import
import ansis from 'ansis';
// ESM named import
import { red, green, blue } from 'ansis';

or
// CommonJS default import
const ansis = require('ansis');
// CommonJS named import
const { red, green, blue } = require('ansis');

console.log(ansis.green('Success!'));
console.log(green('Success!'));

// template string
console.log(green`Success!`);

// chained syntax
console.log(green.bold`Success!`);

// nested syntax
console.log(red`The ${blue.underline`file.js`} not found!`);

Basic example Hello World!:
import { red, black, inverse, reset } from 'ansis';

console.log(green`Hello ${inverse`ANSI`} World!
${black.bgYellow`Warning:`} ${cyan`/path/to/file.js`} ${red`not found!`}`);

Output:\ screenshot "Hello ANSI World!"
Open in StackBlitz

Named import

The ansis supports both the default import and named import.
// default import
import ansis from 'ansis';

ansis.red.bold('text');

You can import named colors, styles and functions. All imported colors and styles are chainable.
// named import
import { red, hex, italic } from 'ansis';

red.bold('text');

Default import and named import can be combined.
// default and named import
import ansis, { red } from 'ansis';

const redText = red('text'); // colorized ANSI string
const text = ansis.strip(redText); // pure string without ANSI codes

Template literals

The ansis supports both the function syntax red('error') and template literals `` rederror ``.
The template literals allow you to make a complex template more readable and shorter.\ The function syntax can be used to colorize a variable.
import { red } from 'ansis';

let message = 'error';

red(message);
red`text`;
red`text ${message} text`;

Chained syntax

All colors, styles and functions are chainable. Each color or style can be combined in any order.
import { red, bold, italic, hex } from 'ansis';

red.bold`text`;
hex('#FF75D1').bgCyan.bold`text`;
bold.bgHex('#FF75D1').cyan`text`;
italic.bold.yellow.bgMagentaBright`text`;

Nested syntax

You can nest functions and template strings within each other. None of the other libraries (chalk, kleur, colorette, colors.js etc.) support nested template strings.
Nested template strings:
import { red, green } from 'ansis';

red`red ${green`green`} red`;

Deep nested chained styles:
import { red, green, cyan, magenta, yellow, italic, underline } from 'ansis';

red(`red ${italic(`red italic ${underline(`red italic underline`)}`)} red`);

// deep nested chained styles
green(
  `green ${yellow(
    `yellow ${magenta(
      `magenta ${cyan(
        `cyan ${red.italic.underline`red italic underline`} cyan`,
      )} magenta`,
    )} yellow`,
  )} green`,
);

Output:\ screenshot nested styles
Multiline nested template strings:
import { red, green, hex, visible, inverse } from 'ansis';

// defined a truecolor as the constant
const orange = hex('#FFAB40');

let cpu = 33;
let ram = 44;
let disk = 55;

// normal colors
visible`
CPU:  ${red`${cpu}%`}
RAM:  ${green`${ram}%`}
DISK: ${orange`${disk}%`}
`;

// inversed colors
inverse`
CPU:  ${red`${cpu}%`}
RAM:  ${green`${ram}%`}
DISK: ${orange`${disk}%`}
`;

Output:\ screenshot multiline nested

Base colors and styles

Colors and styles have standard names used by many popular libraries, such as chalkchalk, colorettecolorette, kleurkleur.
| Foreground colors | Background colors | Styles | |:----------------------|:--------------------------|--------------------------------------------| | black | bgBlack | dim (aliasfaint) | | red | bgRed | bold | | green | bgGreen | italic | | yellow | bgYellow | underline | | blue | bgBlue | strikethrough (alias strike) | | magenta | bgMagenta | doubleUnderline (not widely supported) | | cyan | bgCyan | overline (not widely supported) | | white | bgWhite | frame (not widely supported) | | gray (alias grey) | bgGray (alias bgGrey) | encircle (not widely supported) | | blackBright | bgBlackBright | inverse | | redBright | bgRedBright | visible | | greenBright | bgGreenBright | hidden | | yellowBright | bgYellowBright | reset | | blueBright | bgBlueBright | | | magentaBright | bgMagentaBright | | | cyanBright | bgCyanBright | | | whiteBright | bgWhiteBright | |

Extend base colors

Defaults, the imported ansis instance contains base styles and colors. To extend base colors with custom color names for truecolor use the ansis.extend() method.
import ansis from 'ansis';

// extend base colors
ansis.extend({
  pink: '#FF75D1',
  orange: '#FFAB40',
});

// the custom colors are available under namespace `ansis`
ansis.pink('text');
ansis.orange('text');

Usage example with TypeScript:
import ansis, { AnsiColorsExtend } from 'ansis';

// extend base colors
ansis.extend({
  pink: '#FF75D1',
  orange: '#FFAB40',
});

const write = (style: AnsiColorsExtend<'pink' | 'orange'>, message: string) => {
  console.log(ansis[style](message));
}

write('red', 'message'); // base color OK
write('pink', 'message'); // extended color OK
write('orange', 'message'); // extended color OK
write('unknown', 'message'); // TypeScript Error

ANSI 256 colors

The pre-defined set of 256 colors.

| Code range | Description | |-----------:|-------------------------------------------| | 0 - 7 | standard colors | | 8 - 15 | bright colors | | 16 - 231 | 6 Γ— 6 Γ— 6 cube (216 colors) | | 232 - 255 | grayscale from black to white in 24 steps |
Foreground function: ansi256(code) has short alias fg(code)\ Background function: bgAnsi256(code) has short alias bg(code)
The ansi256() and bgAnsi256() methods are implemented for compatibility with the chalk API.

See ANSI color codes.
import { bold, ansi256, fg, bgAnsi256, bg } from 'ansis';

// foreground color
ansi256(96)`Bright Cyan`;
fg(96)`Bright Cyan`;

// background color
bgAnsi256(105)`Bright Magenta`;
bg(105)`Bright Magenta`;

// function is chainable
ansi256(96).bold`bold Bright Cyan`;

// function is avaliable in each style
bold.ansi256(96).underline`bold underline Bright Cyan`;

// you can combine the functions and styles in any order
bgAnsi256(105).ansi256(96)`cyan text on magenta background`
bg(105).fg(96)`cyan text on magenta background`

Truecolor

You can use the hex or rgb format.
Foreground function: hex() rgb()\ Background function: bgHex() bgRgb()
import { bold, hex, rgb, bgHex, bgRgb } from 'ansis';

// foreground color
hex('#E0115F').bold`bold Ruby`;
hex('#96C')`Amethyst`;
rgb(224, 17, 95).italic`italic Ruby`;

// background color
bgHex('#E0115F')`Ruby`;
bgHex('#96C')`Amethyst`;
bgRgb(224, 17, 95)`Ruby`;

// you can combine the functions and styles in any order
bold.hex('#E0115F').bgHex('#96C')`ruby bold text on amethyst background`

Use ANSI codes

You can use the ANSI escape codes with open and close properties for each style.
import { red, bold } from 'ansis';

// each style has `open` and `close` properties
console.log(`Hello ${red.open}ANSI${red.close} World!`);

// you can defiene own style which will have the `open` and `close` properties
const myStyle = bold.italic.black.bgHex('#E0115F');

console.log(`Hello ${myStyle.open}ANSI${myStyle.close} World!`);

Strip ANSI codes

The Ansis class contains the method strip() to remove all ANSI codes from string.
import ansis from 'ansis';

const ansiString = ansis.green`Hello World!`;
const string = ansis.strip(ansiString);

The variable string will contain the pure string without ANSI codes.

New lines

Supports correct style break at the end of line.
import { bgGreen } from 'ansis';

console.log(bgGreen`\nAnsis\nNew Line\nNext New Line\n`);

output

Shortcuts / Themes

Define your own themes:
import ansis from 'ansis';

const theme = {
  error: ansis.red.bold,
  info: ansis.cyan.italic,
  warning: ansis.black.bgYellowBright,
  ruby: ansis.hex('#E0115F'),
};

theme.error('error');
theme.info('info');
theme.warning('warning');
theme.ruby('Ruby color');

CLI

Defaults, the output in terminal console is colored and output in a file is uncolored.

Environment variables

To force disable or enable colored output use environment variables NO_COLOR and FORCE_COLOR.
The NO_COLOR variable should be presents with any not empty value. The value is not important, e.g., NO_COLOR=1 NO_COLOR=true disable colors. See standard description by NOCOLOR.
The FORCE_COLOR variable should be presents with one of values:\ FORCE_COLOR=0 force disable colors\ FORCE_COLOR=1 force enable colors
For example, app.js:
import { red } from 'ansis';

console.log(red`red color`);

Execute the script in a terminal:
$ node app.js           # colored output in terminal
$ node app.js > log.txt # output in file without ANSI codes

$ NO_COLOR=1 node app.js              # force disable colors, non colored output in terminal
$ FORCE_COLOR=0 node app.js           # force disable colors, non colored output in terminal
$ FORCE_COLOR=1 node app.js > log.txt # force enable colors, output in file with ANSI codes

CLI arguments

Use arguments --no-color or --color=false to disable colors and --color to enable ones.
For example, an executable script app.js:
#!/usr/bin/env node
import { red } from 'ansis';

console.log(red`red color`);

Execute the script in a terminal:
$ ./app.js                        # colored output in terminal
$ ./app.js --no-color             # non colored output in terminal
$ ./app.js --color=false          # non colored output in terminal

$ ./app.js > log.txt              # output in file without ANSI codes
$ ./app.js --color > log.txt      # output in file with ANSI codes
$ ./app.js --color=true > log.txt # output in file with ANSI codes

Warning
The command line arguments have a higher priority than environment variable.

Comparison of most popular libraries

Run the command to see the support of some features by various libraries:
npm run compare

Open in StackBlitz
| Library

- name
- code size
- named import | Naming colors | ANSI 256
colors | True-
color | Chained
syntax | Nested
template strings | New
Line | Supports
CLI params | |:---------------------------------------------------------------------------|:------------------------------------------:|:------------------:|:--------------:|:-----------------:|:--------------------------:|:-----------:|:---------------------------------------------------------| | colors.js
colors.js
18.1KB
❌ named import | non-standard
16 colors | ❌ | ❌ | βœ… | ❌ | βœ… | only
FORCE_COLOR
--no-color
--color | | colors-clicolors-cli
8.6KB
❌ named import | non-standard
16 colors | βœ… | ❌ | βœ… | ❌ | βœ… | only
--no-color
--color | | cli-colorcli-color
❌ named import | standard
16 colors | βœ… | ❌ | βœ… | ❌ | ❌ | only
NO_COLOR | | ansi-colorsansi-colors
5.8KB
❌ named import | standard
16 colors | ❌ | ❌ | βœ… | ❌ | βœ… | only
FORCE_COLOR | | colorettecolorette
3.3KB
βœ… named import | standard
16 colors | ❌ | ❌ | ❌ | ❌ | ❌ | NO_COLOR
FORCE_COLOR
--no-color
--color | | picocolorspicocolors
2.6KB
❌ named import | standard
8 colors | ❌ | ❌ | ❌ | ❌ | ❌ | NO_COLOR
FORCE_COLOR
--no-color
--color | | kleurkleur
2.7KB
βœ… named import | standard
8 colors | ❌ | ❌ | βœ… | ❌ | ❌ | only
NO_COLOR
FORCE_COLOR | | chalkchalk
15KB
❌ named import | standard
16 colors | βœ… | βœ… | βœ… | ❌ | βœ… | NO_COLOR
FORCE_COLOR
--no-color
--color | | ansisansis
3.2KB
βœ… named import | standard
16 colors | βœ… | βœ… | βœ… | βœ… | βœ… | NO_COLOR
FORCE_COLOR
--no-color
--color |
Note
Code size\ The size of distributed code that will be loaded via require or import into your app. It's not a package size.
Named import\ import { red, green, blue } from 'lib';\ or\ const { red, green, blue } = require('lib');
Naming colors - standard: colors have standard names, e.g.: red, redBright, bgRed, bgRedBright - non-standard: colors have lib-specific names, e.g.: brightRed, bgBrightRed, red_b, red_btt
ANSI 256 colors
The method names: - colors-clicolors-cli: x<n> - cli-colorcli-color: xterm(n) - chalkchalk: ansi256(n) bgAnsi256(n) - ansisansis: ansi256(n) bgAnsi256(n) fg(n) bg(n)
Truecolor
The method names: - chalkchalk: hex() rgb() - ansisansis: hex() rgb()
Chained syntax\ lib.red.bold('text')
Nested template strings\ `` lib.redtext ${lib.cyannested} text ``
New line\ Correct break styles at end-of-line.
lib.bgGreen(`First Line
Next Line`);

Show ANSI demo

git clone https://github.com/webdiscus/ansis.git
cd ./ansis
npm i
npm run demo

Run benchmark

git clone https://github.com/webdiscus/ansis.git
cd ./ansis
npm i
npm run bench

Tested on

MacBook Pro 16" M1 Max 64GB\ macOS Monterey 12.1\ Node.js v16.13.1\ Terminal iTerm2

Colorette bench

The benchmark used in colorette.
c.red(`${c.bold(`${c.cyan(`${c.yellow('yellow')}cyan`)}`)}red`);

+  colorette           4,572,582 ops/sec   very fast
   picocolors          3,841,124 ops/sec   very fast
-> ansis               2,669,734 ops/sec   fast
   chalk               2,287,146 ops/sec   fast
   kleur/colors        2,281,415 ops/sec   fast
   kleur               2,228,639 ops/sec   fast
   ansi-colors         1,265,615 ops/sec   slow
   colors.js           1,158,572 ops/sec   slow
   cli-color             470,320 ops/sec   too slow
   colors-cli            109,811 ops/sec   too slow

Base colors

const colors = ['black', 'red', 'green', 'yellow', 'blue', 'magenta', 'cyan', 'white'];
colors.forEach((color) => c[color]('foo'));

+  picocolors          8,265,628 ops/sec  very fast
-> ansis               6,197,754 ops/sec  fast
   kleur               5,455,121 ops/sec  fast
   chalk               4,428,884 ops/sec  fast
   kleur/colors        2,074,111 ops/sec  slow
   colorette           1,874,506 ops/sec  slow
   ansi-colors         1,010,628 ops/sec  slow
   colors.js             640,101 ops/sec  too slow
   cli-color             305,690 ops/sec  too slow
   colors-cli            104,962 ops/sec  too slow

Chained styles

const colors = ['black', 'red', 'green', 'yellow', 'blue', 'magenta', 'cyan', 'white'];
colors.forEach((color) => c[color].bold.underline.italic('foo'));

+  ansis               5,515,868 ops/sec  very fast
   chalk               1,234,573 ops/sec  fast
   kleur                 514,035 ops/sec  slow
   ansi-colors           158,921 ops/sec  too slow
   cli-color             144,837 ops/sec  too slow
   colors.js             138,219 ops/sec  too slow
   colors-cli             52,732 ops/sec  too slow
   kleur/colors        (not supported)
   colorette           (not supported)
   picocolors          (not supported)

Nested calls

const colors = ['black', 'red', 'green', 'yellow', 'blue', 'magenta', 'cyan', 'white'];
colors.forEach((color) => c[color](c.bold(c.underline(c.italic('foo')))));

+  picocolors            942,592 ops/sec  very fast
   colorette             695,350 ops/sec  fast
   kleur                 648,195 ops/sec  fast
   kleur/colors          561,111 ops/sec  fast
-> ansis                 558,575 ops/sec  fast
   chalk                 497,292 ops/sec  fast
   ansi-colors           260,316 ops/sec  slow
   colors.js             166,425 ops/sec  slow
   cli-color              65,561 ops/sec  too slow
   colors-cli             13,800 ops/sec  too slow

Nested styles

c.red(
  `a red ${c.white('white')} red ${c.red('red')} red ${c.cyan('cyan')} red ${c.black('black')} red ${c.red('red')} red
  ${c.red('red')} red ${c.red('red')} red ${c.red('red')} red ${c.red('red')} red ${c.red('red')} red ${c.red('red')} red
  ${c.green('green')} red ${c.red('red')} red ${c.yellow('yellow')} red ${c.blue('blue')} red ${c.red('red')} red
  ${c.magenta('magenta')} red ${c.red('red')} red ${c.red('red')} red ${c.red('red')} red ${c.red('red')} red
  ${c.red('red')} red ${c.red('red')} red ${c.red('red')} red ${c.red('red')} red ${c.red('red')} red
  ${c.black('black')} red ${c.yellow('yellow')} red ${c.red('red')} red ${c.red('red')} red ${c.red('red')} red
  ${c.yellow('yellow')} red ${c.red('red')} red ${c.red('red')} red ${c.red('red')} red ${c.red('red')} red
  ${c.green('green')} red ${c.red('red')} red ${c.red('red')} red ${c.red('red')} red ${c.red('red')} red
  ${c.magenta('magenta')} red ${c.red('red')} red ${c.red('red')} red ${c.cyan('cyan')} red ${c.red('red')} red
  ${c.cyan('cyan')} red ${c.red('red')} red ${c.red('red')} red ${c.red('red')} red ${c.red('red')} red message`
);

+  picocolors            243,975 ops/sec  very fast
   colorette             243,139 ops/sec  very fast
   kleur/colors          234,132 ops/sec  very fast
   kleur                 221,446 ops/sec  very fast
-> ansis                 211,868 ops/sec  very fast
   chalk                 189,960 ops/sec  fast
   ansi-colors           121,451 ops/sec  slow
   colors.js              89,633 ops/sec  too slow
   cli-color              41,657 ops/sec  too slow
   colors-cli             14,264 ops/sec  too slow

Deep nested styles

c.green(
  `green ${c.cyan(
    `cyan ${c.red(
      `red ${c.yellow(
        `yellow ${c.blue(
          `blue ${c.magenta(`magenta ${c.underline(`underline ${c.italic(`italic`)} underline`)} magenta`)} blue`
        )} yellow`
      )} red`
    )} cyan`
  )} green`
);

+  colorette           1,131,757 ops/sec  very fast
   picocolors          1,002,649 ops/sec  very fast
-> ansis                 882,220 ops/sec  very fast
   chalk                 565,965 ops/sec  fast
   kleur/colors          478,547 ops/sec  fast
   kleur                 464,004 ops/sec  fast
   colors.js             451,592 ops/sec  fast
   ansi-colors           362,733 ops/sec  slow
   cli-color             213,441 ops/sec  slow
   colors-cli             40,340 ops/sec  too slow

HEX colors

Only two libraries support truecolor: ansis and chalk
c.hex('#FBA')('foo');

+  ansis               4,944,572 ops/sec  very fast
   chalk               2,891,684 ops/sec  fast
   colors.js           (not supported)
   colorette           (not supported)
   picocolors          (not supported)
   cli-color           (not supported)
   colors-cli          (not supported)
   ansi-colors         (not supported)
   kleur/colors        (not supported)
   kleur               (not supported)

Testing

npm run test will run the unit and integration tests.\ npm run test:coverage will run the tests with coverage.

Also See

Most popular ANSI libraries for Node.js:

License

ISC