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  4. jwt-cli: A Shell Library to Decode JWTs [Snippet]

jwt-cli: A Shell Library to Decode JWTs [Snippet]

Check out this handy shell script that makes it easy to decode multiple JSON Web Tokens, as well as a code snippet of the script in action.

By 
Enrico Maria Crisostomo user avatar
Enrico Maria Crisostomo
·
May. 15, 18 · Code Snippet
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When I started needing to decode JSON Web Tokens quite often, I felt the urge to write a program that allowed me to do it quickly. There are excellent options, such as jwt.io, but as soon as you need to do this operation often enough, it becomes clumsy. And if you need to process multiple tokens, or further process the output, something else becomes a necessity.

That's why I wrote a little shell script that allows you to do just that. jwt-decode will accept a list of tokens as arguments and will decode them on a standard output. The syntax is the following:

$ jwt-decode token ...
{
  "alg": "RS256",
  "typ": "JWT",
  "kid": "sbS_BWBm0GzfIQRnYWolcWDRnjqwDTY_Aq6Fn_boqKM"
}
{
  "jti": "271151a3-db11-4f37-a724-4cf9957774f4",
  "exp": 1530979706,
  "nbf": 0,
  "iat": 1523117306,
  "iss": "https://domain.com/auth/realms/realm",
  "aud": "app-name",
  "sub": "5132c417-d772-420e-b5db-401ea633dca1",
  "typ": "Bearer",
  "azp": "app",
  "auth_time": 0,
  "session_state": "84e6a759-e54d-4fd7-9fcf-bb51131aab89",
  "acr": "1",
  "allowed-origins": [
    ""
  ],
  "realm_access": {
    "roles": [
      "role0",
      "role1",
      "role2"
    ]
  },
  "resource_access": {
    "account": {
      "roles": [
        "manage-account",
        "manage-account-links",
        "view-profile"
      ]
    }
  },
  "custom-property": "1797"
}
...


You can find jwt-cli on GitHub.

shell Library

Published at DZone with permission of Enrico Maria Crisostomo, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

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  • While Performing Dependency Selection, I Avoid the Loss Of Sleep From Node.js Libraries' Dangers
  • Understanding ldd: The Linux Dynamic Dependency Explorer
  • Practical Use of Weak Symbols

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