JWT token - consume REST POST API at client side

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C#

SharePoint2013

<I need to consume a REST API. RESTAPI will return an JWT token as a response , by calling REST POST method.
I need to decode and validate the JWT token at my end and then redirect users to certain URL's accordingly based on token expiry time. I have a shared secret code and the Client ID of the service.

If (token is expired)then redirect to login page ,
else
redirect to the web application.

I just need to consume the service. Hence i think , client side coding only will be enough to handle decoding and validation of token.

I am implementing this in SharePoint 2013 , but normal c# code would cater to this too.

Any technical advice on this would be greatly helpful. Looking forward to your response. Thanks all.

What I have tried:

1. I am implementing this in SharePoint 2013. Hence i tried SP designer workflow , to consume the REST HTTP service . However , after receiving the JWT response , i need to decode and validate the JWT token to redirect users based on token expiry time.

Just have a concern if decoding and validating of JWT token part can be handled in SP designer.