# Joken problem - (UndefinedFunctionError) function Joken.using/1 is undefined or private

**URL:** <https://forum.elixirforum.com/t/joken-problem-undefinedfunctionerror-function-joken-using-1-is-undefined-or-private/59594>\
**Category:** Questions\
**Tags:** joken\
**Created:** [November 9, 2023, 1:58pm UTC](https://forum.elixirforum.com/t/joken-problem-undefinedfunctionerror-function-joken-using-1-is-undefined-or-private/59594 "2023-11-09T13:58:42Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![victorolinasc](https://forum.elixirforum.com/user_avatar/forum.elixirforum.com/victorolinasc/32/10667_2.png) [@victorolinasc](https://forum.elixirforum.com/u/victorolinasc)\
**Post date:** [November 10, 2023, 1:38pm UTC](https://forum.elixirforum.com/t/joken-problem-undefinedfunctionerror-function-joken-using-1-is-undefined-or-private/59594/6 "2023-11-10T13:38:39Z")

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@SkyFlyOne you should ` use Joken.Config` and not ` Joken`.

The docs also show you better intended ways of using Joken’s API. For instance, when “using” the config, you get some generated implementations of encode/decode and some others.

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