Unpack JWY in Bash

jwt_unpack.sh

curl -XPOST -H 'Content-Type: application/x-www-form-urlencoded' \
  http://localhost:8080/auth/realms/{realm}/protocol/openid-connect/token \
  -d 'grant_type=client_credentials&client_id={client}&client_secret={sectet}' \
  2>/dev/null | jq '.access_token | split(".") | .[0],.[1] | @base64d | fromjson'

result.json

{
  "alg": "RS256",
  "typ": "JWT",
  "kid": "j1zghTz1wRP5BNa1TNHF11Wz10whKwoM1Rn1B6YM11c"
}
{
  "exp": 1658947892,
  "iat": 1658947592,
  "jti": "3f4b2911-196d-48a0-8c13-b349d4554b8e",
  "iss": "http://localhost:8080/auth/realms/realm",
  "sub": "99686cb6-908e-471c-b945-6c1da9f43713",
  "typ": "Bearer",
  "azp": "client",
  "acr": "1",
  "scope": "userId",
  "userId": "99686cb6-908e-471c-b945-6c1da9f43713"
}