FelisOrion
Failing to decode JWT and get payload
Hi all,
I have some troubles to decode JWT encode with alg “RS256”.
I need only payload, I really don’t care if its valid or not.
Tried using erlang-jose but nothing worked.
I used JOSE.JWS.expand(my_token) and tried with JOSE.JWS.peek_payload(my_token) also tried with other alg, but nothing worked always getting error:
** (ArgumentError) argument error: [with_my_token]
I tried to do the same with python using pyJWT and it worked.. Some one have any idea how to get payload from JWT in elixir/erlang. Thank you 
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First 10 of 11 Posts
kokolegorille
Hello, do You have some sample data to test? It would be easier…
FelisOrion
I wish I could, but this token I don’t sign or create. It just passed to me, and I can’t share the one I’m working with
. So until now I tried decode JWT my self as it just json encoded in base64. But using 
..
Base.decode64i got just:error[ h | _] = String.split(token, ".")that should get header with it did, but decoding not workingBase. tried doing it online and its worked..h="eyJraWQiOiJVbXFLSm16V0JjT1BueUZ4SlNkRDFkZ3hyUmx6Y21ocmlxbW53enZ5NDJNPSIsImFsZyI6IlJTMjU2In0"strange right.kokolegorille
Did You try guardian? RS256 is in the list of allowed algorithms.
FelisOrion
Guardian use same library erlang-jose, also I read to code to see how they get payload and done the same. Same error
kokolegorille
Yes, it uses JOSE under the hood…
FelisOrion
Would be nice just to be able to decode base64, but it also not working
kokolegorille
Sorry, I cannot help You on this one… But I am sure someone will give You better advice
FelisOrion
Don’t worry
thank you for trying
FelisOrion
So reading code of
.. by comparing strings I find out that last part of string always without
:base64erlang library and doing some tests with binary, I figured out that my base64 json is badly encoded even if it work in online decode=at the end, witch representIn0= == "}. So I just ad simple function to check and add last part, and then convert with:base64.decodeand decode with Jason. It more a hack then solution, but it working.. If some one get with better idea message me please.NobbZ
No need to,
Base.decode64/2knows a:paddingoption, that will work without the padding in the string: