Wikipedia: Hexadecimal
The hex module encodes bytes to a lowercase hexadecimal string and decodes hex strings back to bytes.
fmt := import("fmt")
hex := import("hex")
encoded := hex.encode(bytes("Hello"))
fmt.println(encoded)
decoded := hex.decode(encoded)
fmt.println(string(decoded))
fmt.println(hex.encode(bytes("AB")))
fmt.println(hex.encode(bytes("\x00\x01\x7f\xff")))
try it
48656c6c6f Hello 4142 00017fff