Plack::Middleware::Auth::JWT - Token-based Auth (aka Bearer Token) using JSON Web Tokens (JWT)


version 0.904


  # use Crypt::JWT to decode the JWT
  use Plack::Builder;
  builder {
      enable "Plack::Middleware::Auth::JWT",
          decode_args => { key => '12345' },

  # or provide your own decoder in a callback
  use Plack::Builder;
  builder {
      enable "Plack::Middleware::Auth::JWT",
          decode_callback => sub {
              my $token = shift;

  # curl -H 'Authorization: Bearer eyJhbG...'
  # if the JWT is valid, two keys will be added to $env->{psgix}
  # $env->{'psgix.token'}  = 'original_token'
  # $env->{''} = { sub => 'bart' } # claims as hashref


Plack::Middleware::Auth::JWT helps you to use JSON Web Tokens (or JWT) for authentificating HTTP requests. Tokens can be provided in the Authorization HTTP Header, or as a query parameter (though passing the JWT via the header is the prefered method).




See "decode_jwt" in Crypt::JWT

Please note that key might has to be passed as a string-ref or an object, see Crypt::JWT

It is very much recommended that you only allow the algorithms you are actually using by setting accepted_alg! Per default, 'none' is not allowed.


        decode_payload = 1
        decode_header  = 0

Different defaults:

        verify_exp = 1
        leeway     = 5

You either have to use decode_args, or provide a decode_callback.


Callback to decode the token. Gets the token as a string and the psgi-env, has to return a hashref with claims.

You have to either provide a callback, or use decode_args.


Default: claims

Name of the entry in psgix were the claims are stored, so you can get the (for example) sub claim via



Default: token

Name of the entry in psgix were the raw token is stored.


Default: false

If set to a true value, all requests need to include a valid JWT. Default false, so you have to check in your application code if a token was submitted.


Default: false

If set to a true value, passing an invalid JWT will not abort the requerst with status 401. Instead the app will be called as if no token was passed at all.

You can use this to implement another token check in a later middleware, or even in your app. Of course you will then have to check for $env->{psgix.token} in your controller actions.


Default: Bearer

Name of the token in the HTTP Authorization header. If you set it to 0, headers will be ignored.


Default: token

Name of the HTTP query param that contains the token. If you set it to 0, tokens in the query will be ignored.


TODO, in the meantime you can take a look at the tests.



Thanks to

  • for supporting Open Source.

  • jwright for fixing a regression in the tests caused by an update in Crypt::JWT error messages. The same issue was also reported by SREZIC.


Thomas Klausner <>


This software is copyright (c) 2017 - 2019 by Thomas Klausner.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.