FreeCodeCamp Daily Challenges

Hex Validator

Given a string, determine whether it is a valid CSS hex color. A valid CSS hex color must:

• Start with a '#'.
• be followed by either 3 or 6 hexadecimal characters.

Hexadecimal characters are numbers 0 through 9 and letters a through f (case-insensitive).

(2026, Jan 23)

Scaled Image

Given a string representing the width and height of an image, and a number to scale the image, return the scaled width and height.

• The input string is in the format "WxH". For example, "800x600".
• The scale is a number to multiply the width and height by.

Return the scaled dimensions in the same "WxH" format.

(2026, Jan 25)

FizzBuzz Mini

Given an integer, return a string based on the following rules:

• If the number is divisible by 3, return "Fizz".
• If the number is divisible by 5, return "Buzz".
• If the number is divisible by both 3 and 5, return "FizzBuzz".
• Otherwise, return the given number as a string.

(2026, Jan 26)