I can easily conditionally set a field to `null`:

```sh
echo '{"id": 1, "more": "fields"}' \
  | jq '{newId: (if .id == 1 then null else .id end), newMore: .more}'

```

yields

```
{
  "newId": null,
  "newMore": "fields"
}

```

But how can I conditionally delete it? I'm looking for something like:

```sh
echo '{"id": 1, "more": "fields"}' \
  | jq '{
          newId: (if .id == 1 then <special-value> else .id end), 
          newMore: .more
       }'

```

to yield

```
{
  "newMore": "fields"
}

```

Does such a `<special-value>` exist? If not, what are other viable solutions? They should ideally also be usable for large objects with many additional and nested fields.