data = {foo: 'bar'}
exp_payload = { :data => data, :exp => 1.month.from_now.to_i }
hmac_secret = "yo"

token = JWT.encode exp_payload, hmac_secret, 'HS256'
# => "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJkYXRhIjp7ImZvbyI6ImJhciJ9LCJleHAiOjE1MTIwNzQ4Njl9.b7vPoy6oU4W0x0qtcMm0cDjg3uMOFBY5mbL1Bj0BkeQ"


JWT.decode token, hmac_secret, true, { :algorithm => 'HS256' }
# => [{"data"=>{"foo"=>"bar"}, "exp"=>1512074869}, {"typ"=>"JWT", "alg"=>"HS256"}]