Last Updated: December 04, 2019

Printing colorful text in terminal when run node js script

You can print colorful text to command when run nodejs application.

console.log('\x1b[36m%s\x1b[0m', info);  //cyan
console.log('\x1b[33m%s\x1b[0m: ', path);  //yellow

Here is reference of colors and other characters:

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"

P/s: I am using terminal in Mac OS.

#node

#javascript

Written by Dan

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7 Responses

Add your response

steve-jansen

FYI - the npm colors package is amazing for this.

screenshot

over 1 year ago ·

rafaelbattesti

Wow, that is so cool! Thanks a lot for sharing!

over 1 year ago ·

falsefalse

[
 [ 'warn',  '\x1b[35m' ],
 [ 'error', '\x1b[31m' ],
 [ 'log',   '\x1b[2m'  ]
].forEach(function(pair) {
  var method = pair[0], reset = '\x1b[0m', color = '\x1b[36m' + pair[1];
  console[method] = console[method].bind(console, color, method.toUpperCase(), reset);
});

over 1 year ago ·

dimoreira

How to get this working on Heroku logs (heroku logs) CLI?

over 1 year ago ·

finalclass

Thx a lot!
I've used it to make my logs look better:

/**
 * Does console.log and formats the data a nice way
 * @param {any[]} ...args
 */
function log() {
    var args = Array.prototype.slice.call(arguments);
    var logToWrite = args.map(function (arg) {
        var str;
        var argType = typeof arg;

        if (arg === null) {
            str = 'null';
        } else if (arg === undefined) {
            str = '';
        } else if (!arg.toString || arg.toString() === '[object Object]') {
            str = JSON.stringify(arg, null, '  ');
        } else if (argType === 'string') {
            str = '"' + arg.toString() + '"';
        } else {
            str = arg.toString();
        }

        return '\x1b[36m<\x1b[0m' + str + '\x1b[36m>\x1b[0m';
    }).join(', ');
    console.log(logToWrite);
}

over 1 year ago ·

Andrews54757

Thanks, this was so useful, so I created my own colors module based upon your observations. https://www.npmjs.com/package/styleme

over 1 year ago ·

adetech

Here's my contribution
function colorTextLog(text, color) { return `\x1b[${color}m${text}\x1b[0m`; } // Test logging specific words console.log(`Hi, I'm ${colorTextLog('cyan color', '36')}!`);

over 1 year ago ·