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require 'jwt'

payload = { data: 'test' }
hmac_secret = 'my$ecretK3y'

token = JWT.encode(payload, hmac_secret, 'HS256')
#eyJhbGciOiJIUzI1NiJ9.eyJkYXRhIjoidGVzdCJ9.pNIWIL34Jo13LViZAJACzK6Yf0qnvT_BuwOxiMCPE-Y

puts token

decoded_token = JWT.decode(token, hmac_secret, true, { algorithm: 'HS256' })
# Array
# [
#   {"data"=>"test"}, # payload
#   {"alg"=>"HS256"} # header
# ]
puts decoded_token