Check if a string is a valid color

For client-side only, not work in Node.js

Simple color validator function

let isValidColor = (color) => {
  let otpNode = new Option();
  otpNode.style.color = color;

  return !!otpNode.style.color;
};

Usage

// Valid colors
isValidColor("purple"); // true
isValidColor("burlywood"); // true
isValidColor("lightsalmon"); // true
isValidColor("rgb(255, 255, 255)"); // true
isValidColor("rgba(255, 255, 255, .5)"); // true
isValidColor("#ccc"); // true
isValidColor("hsl(100, 0%, 18%)"); // true

// Invalid colors
isValidColor("not-a-color-name"); // false
isValidColor("dark gray"); // false. Should be 'darkgray'
isValidColor("rgb(255, 255, 255, 1, 1)"); // false
isValidColor("#ccczzz"); // false

Caveat

Strings like unset, initial, inherit, currentcolor, transparent are also valid values, so if you want to exclude these strings, just change the function a bit:

let isValidColor = (color) => {
  let otpNode = new Option();
  otpNode.style.color = color;

  return (
    !!otpNode.style.color &&
    !/(unset|initial|inherit|currentcolor|transparent)/i.test(color)
  );
};

isValidColor("rgb(-1, 255, 255)"); // true
isValidColor("none"); // false
isValidColor("initial"); // false
isValidColor("gray"); // true