JWT decoder

From: Masih Tavassoli <mtavasso(at)yahoo(dot)co(dot)uk>
To: "pgsql-general(at)lists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org>
Subject: JWT decoder
Date: 2021-08-09 02:16:12
Message-ID: 2138331050.291272.1628475372080@mail.yahoo.com
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Hi experts,
I am trying to find a way to decode a URL request header and extract its JSON fields in postgreql .
I can do this in Oracle sql using 

select    (utl_raw.cast_to_varchar2 (utl_encode.base64_decode( utl_raw.cast_to_raw (regexp_replace ( ( 'eyJhbGciOiJSUzI1NiIsImtpZCI6InBhLWFwaS1zaWduIn0.eyJzY29wZSI6W10sInN1YiI6Imp1bGllQHNhcHBoaXJlY29udmV5YW5jaW5nLm5ldC5hdSIsImNsaWVudCI6InB4YV9hY19zZXR0c3BsdXMiLCJ1c2VybmFtZSI6Imp1bGllQHNhcHBoaXJlY29udmV5YW5jaW5nLm5ldC5hdSIsImV4cCI6MTU1NDA4NzU2N30.OZwVETCP+HUDsSkudCfa52eQT2Fyt6BgefFpYr5xpJROjZJeVnXtzsU6MS8aHauqyyOwQSz8iG6OC2YjYgrGiZ8YTwTh1uHptNjicyCFmCkh++d0oGdK78ZOKIAvuslW3GX4V13hPUJADzGLkyO8hy01YF9Id4+7GrvmnRRkwPO7C2eUvKTB8pxDAA94Jpw74s4BiNTmm1Uv+56AXqdI8m2KFkLNwGoUR3OSNvsifl5uxBsGGmP4wbgNe/Dy1q2UsL2eBAW/GuWryHGCRz1/PR2jIV1v21ClQ8YLiFAzM3YxHb8m2ngzRynKof+Nw3nZvuafRQ16MV5THz0ahGFYLA'
), '[[:space:]]', ''))))) from dual

But there doesn't seem to be a way doing it in postgres.
Has anyone got any suggesions?
ThanksMasih

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