Using jq to update objects within a JSON document if the value corresponding to a given key starts with a specified string

Question

I have the given JSON and want to change the id value of all elements, which starts with test in the name element:

{
          


        

Answer 1

You can also use map, like this:

jq '(.values)|=(map((if .name|startswith("test") then .id="NEWID"  else . end)))' file

Output:

{
  "other-value": "some-id",
  "values": [
    {
      "name": "test-2017-12-01",
      "id": "NEWID"
    },
    {
      "name": "othert",
      "id": "2"
    }
  ]
}