How to modify a nested object with jq

Question

Given this

{
  "some": "property",
  "nested": {
    "hello": "world"
  }
}

I'd like to get this result with jq

{
  "some": "property",
  "nested": {
    "hello": "world",
    "freshly": "added"
  }
}

So how can I add the freshly added field ? I don't know how many properties are at root level (and I want to keep them all), I only know the name of the nested object (here "nested"), the name of the property I'd like to add (here "freshly") and its value.

Answer 1

Just assign the new value to the nested object.

.nested.freshly = "added"

Answer 2

Well I found out myself how to do it. If you have a better solution, you're more than welcome to give it here.

jq '.nested=(.nested + {"freshly": "added"})'

Answer 3

You can also do simply

.nested += {freshly: "added"}

Then you can add multiple nested keys at once