Add JSON object to JSON file using JQ

Question

Given the following JSON file (sample.json)

{
  "api": "3.0.0",
  "data": {
    "description": "something",
    "title": "hello",
    "version": "1.0",
    "app": {
      "name": "abc",
      "id": "xyz"
    }
  }
}

I wish to add the following JSON object at root level to the file above:

{
  "heading": {
    "user": ["$username"]
  }
}

Where $username is a Bash variable.

Is there a better way to achieve this than the following?

blob=$(jq -n --arg foo API_NAME '{"heading": {"user": [env.username]}}')

jq --argjson obj "$(echo $blob)" '. + $obj' < sample.json

Useless echo? Instead of 'cmd $(echo foo)' just use 'cmd foo' — glenn jackman
– glenn jackman, Commented Oct 27, 2022 at 12:45

pmf · Accepted Answer · 2022-10-27 00:02:36Z

2

Just move what you create as blob directly into the other filter, ending up with just one jq call:

jq --arg username "$username" '. + {heading: {user: [$username]}}' sample.json

answered Oct 27, 2022 at 0:02

pmf

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