Question 190049 in 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

Json – jq: Move subset of fields under a new field

I have JSON data files that I’d like to modify somewhat. From:

{
    "alpha": "...",
    "beta": [ ... ],
    "delta": { ... },
    "gamma": "..."
}

to:

{
    "alpha": "...",
    "epsilon" : {
        "beta": [ ... ],
        "delta": { ... }
    },
    "gamma": "..."
}

This is, I want to define a subset of fields that I want to extract and move into a new object with a specific name. How do I perform such a task with jq?

Tags:

2

Answers


  1. 0

    jq '{ alpha, epsilon: { beta, delta }, gamma }' input.json > output.json

    Login or Signup to reply.
  2. 0

    define a subset of fields that I want to extract and move

    Here’s a programmatic way:

    jq --argjson fields '["beta", "delta"]' '
 def project($fields): . as $in | reduce $fields[] as $k ({}; .[$k] = $in[$k]);

 .epsilon = project($fields)
 | delpaths( [$fields[]| [.]] )
 '
    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search