How to change node.js's console font color?

If you want to change the colors directly yourself without a module try

console.log('\x1b[36m', 'sometext' ,'\x1b[0m');

First \x1b[36m to change the colors to 36 and then back to terminal color 0.

Here's a list of ANSI color codes

to color your output You can use examples from there:
https://help.ubuntu.com/community/CustomizingBashPrompt

Also a Gist for nodeJs

For example if you want part of the text in red color, just do console.log with:

"\033[31m this will be red \033[91m and this will be normal"

Based on that I've created "colog" extension for Node.js. You can install it using:

npm install colog

Repo and npm: https://github.com/dariuszp/colog

This is a list of available colors (background,foreground) in console with available actions (reset,reverse,...).

const colors = {
 Reset: "\x1b[0m",
 Bright: "\x1b[1m",
 Dim: "\x1b[2m",
 Underscore: "\x1b[4m",
 Blink: "\x1b[5m",
 Reverse: "\x1b[7m",
 Hidden: "\x1b[8m",
 fg: {
  Black: "\x1b[30m",
  Red: "\x1b[31m",
  Green: "\x1b[32m",
  Yellow: "\x1b[33m",
  Blue: "\x1b[34m",
  Magenta: "\x1b[35m",
  Cyan: "\x1b[36m",
  White: "\x1b[37m",
  Crimson: "\x1b[38m" //القرمزي
 },
 bg: {
  Black: "\x1b[40m",
  Red: "\x1b[41m",
  Green: "\x1b[42m",
  Yellow: "\x1b[43m",
  Blue: "\x1b[44m",
  Magenta: "\x1b[45m",
  Cyan: "\x1b[46m",
  White: "\x1b[47m",
  Crimson: "\x1b[48m"
 }
};

Use it as following :

 console.log(colors.bg.Blue, colors.fg.White , "I am white message with blue background", colors.Reset) ; 
 //don't forget "colors.Reset" to stop this color and return back to the default color

You can also install :

npm install console-info console-warn console-error --save-dev

IT will give you an output closer to console of client side :

Per this documentation, you can change the colors based on the data type of the output:

// you'll need the util module
var util = require('util');

// let's look at the defaults: 
util.inspect.styles

{ special: 'cyan',
  number: 'yellow',
  boolean: 'yellow',
  undefined: 'grey',
  null: 'bold',
  string: 'green',
  date: 'magenta',
  regexp: 'red' }

// what are the predefined colors?
util.inspect.colors

{ bold: [ 1, 22 ],
  italic: [ 3, 23 ],
  underline: [ 4, 24 ],
  inverse: [ 7, 27 ],
  white: [ 37, 39 ],
  grey: [ 90, 39 ],
  black: [ 30, 39 ],
  blue: [ 34, 39 ],
  cyan: [ 36, 39 ],
  green: [ 32, 39 ],
  magenta: [ 35, 39 ],
  red: [ 31, 39 ],
  yellow: [ 33, 39 ] }

These appear to be ANSI SGR escape codes, where the first number is the code to emit before the output, and the second number is the code to emit after. So if we look at the chart of ANSI SGR codes on Wikipedia, you'll see that most of these start with a number 30-37 to set the foreground color, and end in 39 to reset to the default foreground color.

So one thing I don't like is how dark some of these are. Especially dates. Go ahead and try new Date() in the console. Dark magenta on black is really hard to read. Let's change that to a light magenta instead.

// first define a new color
util.inspect.colors.lightmagenta = [95,39];

// now assign it to the output for date types
util.inspect.styles.date = 'lightmagenta';

Now when you try new Date(), the output is much more readable.

If you'd like to set colors automatically when launching node, create a script that launches the repl, like this:

// set your colors however desired
var util = require('util');
util.inspect.colors.lightmagenta = [95,39];
util.inspect.styles.date = 'lightmagenta';

// start the repl    
require('repl').start({});

Save this file (for example, init.js), then run node.exe init.js. It will set the colors and launch the node.js command prompt.

(Thanks to loganfsmyth in this answer for the repl idea.)

Reset: "\x1b[0m"
Bright: "\x1b[1m"
Dim: "\x1b[2m"
Underscore: "\x1b[4m"
Blink: "\x1b[5m"
Reverse: "\x1b[7m"
Hidden: "\x1b[8m"

FgBlack: "\x1b[30m"
FgRed: "\x1b[31m"
FgGreen: "\x1b[32m"
FgYellow: "\x1b[33m"
FgBlue: "\x1b[34m"
FgMagenta: "\x1b[35m"
FgCyan: "\x1b[36m"
FgWhite: "\x1b[37m"

BgBlack: "\x1b[40m"
BgRed: "\x1b[41m"
BgGreen: "\x1b[42m"
BgYellow: "\x1b[43m"
BgBlue: "\x1b[44m"
BgMagenta: "\x1b[45m"
BgCyan: "\x1b[46m"
BgWhite: "\x1b[47m"

For example if you want to have a Dim, Red text with Blue background you can do it in Javascript like this:

console.log("\x1b[2m", "\x1b[31m", "\x1b[44m", "Sample Text", "\x1b[0m");

The order of the colors and effects seems to not be that important but always remember to reset the colors and effects at the end.