Json Question posted in
Our archive of expertly curated questions and answers provides insights and solutions to common problems related to this popular data interchange format. From parsing and manipulating JSON data to integrating it with various programming languages and web services, our archive has got you covered. Start exploring today and take your JSON skills to the next level

How to get the claims from a JWT token in JSON into the object?

I have a JSON object that contains a JWT token. I would like to extract the claims from the token and put them into the JSON object, replacing the token. Here is my object:

{
  "id": 7,
  "time": "now",
  "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJuYW1lIjoiYm9iYnkiLCJjb2xvciI6ImJsdWUiLCJ0cmVlIjoiZWxtIn0K.9JCVXpkI6ICc5RnIsIiN1IzUIJiOicGbhJye"
}

The JWT contains these claims (base64 encoded in the middle field of the JWT, delimited by dots):

{
    "name": "bobby",
    "color": "blue",
    "tree": "elm"
}

How can I pull out the claims and put them into the JSON in place of the JWT token using jq?

Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    Use the splits function to split the token on dots, the @base64d filter to base64 decode the data, and the fromjson filter to turn the string into JSON.

    The |= update operator can be used to assign the result back to the .token field.

    jq '.token |= ([splits("\.")][1] | @base64d | fromjson)' file.json

    Result:

    {
  "id": 7,
  "time": "now",
  "token": {
    "name": "bobby",
    "color": "blue",
    "tree": "elm"
  }
}

  2. 0

    Split the value of .token at the dot into an array, take the second item, and use @base64d to decode base64, and fromjson to interpret the output as JSON:

    jq '.token |= ((./".")[1] | @base64d | fromjson)'

    {
  "id": 7,
  "time": "now",
  "token": {
    "name": "bobby",
    "color": "blue",
    "tree": "elm"
  }
}

    Demo

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search