JQ: Remove json objects from array - arrays

Question

I have this json file with hundreds of entries that I need to strip from data I do not need.
Snippet:
{
"entries": [
{
"metadata": {
"tags": [
]
},
"sys": {
"space": {
"sys": {
"type": "Link",
"linkType": "Space",
"id": "9kn72w8zc6fh"
}
},
"id": "vcLKKhJ3mZNfGMvVZZi07",
"type": "Entry",
"createdAt": "2021-05-20T15:14:01.358Z",
"updatedAt": "2021-09-20T15:28:30.799Z",
"environment": {
"sys": {
"id": "production",
"type": "Link",
"linkType": "Environment"
}
},
"publishedVersion": 47,
"publishedAt": "2021-09-20T15:28:30.799Z",
"firstPublishedAt": "2021-05-25T10:26:56.722Z",
"createdBy": {
"sys": {
"type": "Link",
"linkType": "User",
"id": "6F84RwUIY9cXNNXBoQemqX"
}
},
"updatedBy": {
"sys": {
"type": "Link",
"linkType": "User",
"id": "6F84RwUIY9cXNNXBoQemqX"
}
},
"publishedCounter": 4,
"version": 48,
"publishedBy": {
"sys": {
"type": "Link",
"linkType": "User",
"id": "6F84RwUIY9cXNNXBoQemqX"
}
},
"contentType": {
"sys": {
"type": "Link",
"linkType": "ContentType",
"id": "page"
}
}
},
"fields": {
"title": {
"de-DE": "Startseite",
"en-US": "Home"
},
"description": {
"en-US": "foo"
},
"keywords": {
"en-US": "bar"
},
"stageModules": {
"en-US": [
{
"sys": {
"type": "Link",
"linkType": "Entry",
"id": "11AfBBuNK8bx3EygAS3WTY"
}
}
]
},
"contentModules": {
"en-US": [
{
"sys": {
"type": "Link",
"linkType": "Entry",
"id": "7uyuyIBsXWApHqpR7Pgkac"
}
},
{
"sys": {
"type": "Link",
"linkType": "Entry",
"id": "4HILHPLjqQkP2H1hA2FeBG"
}
},
{
"sys": {
"type": "Link",
"linkType": "Entry",
"id": "QuwRHL3XMSkguqrL1hUzC"
}
},
{
"sys": {
"type": "Link",
"linkType": "Entry",
"id": "4ZyVef5oWhQWXK9V1lr3vz"
}
}
]
},
"layout": {
"en-US": "Wide"
}
}
}
]
}
From the entries array, I actually only need:
entries.sys.id
entries.sys.contentType.sys.id
entries.fields
I came up with:
jq \
'.entries | .[] .sys, .[] .fields | del(.createdAt, .createdBy, .environment, .firstPublishedAt, .metadata, .publishedAt, .publishedBy, .publishedCounter, .publishedVersion, .space, .type, .updatedAt, .updatedBy, .version)' \
$infile >| $outfile
However, this changes the structure of the document. The entries node is missing (due to the .entries filter):
{
"id": "vcLKKhJ3mZNfGMvVZZi07",
"contentType": {
"sys": {
"type": "Link",
"linkType": "ContentType",
"id": "page"
}
}
}
{
"id": "1UgOmHIvsWrFEf1VCa84kz",
"contentType": {
"sys": {
"type": "Link",
"linkType": "ContentType",
"id": "moduleText"
}
}
}
{
"title": {
"de-DE": "Startseite",
"en-US": "Home"
},
"description": {
"en-US": "Foo"
},
"keywords": {
"en-US": "Bar"
},
"stageModules": {
"en-US": [
{
"sys": {
"type": "Link",
"linkType": "Entry",
"id": "11AfBBuNK8bx3EygAS3WTY"
}
}
]
},
"contentModules": {
"en-US": [
{
"sys": {
"type": "Link",
"linkType": "Entry",
"id": "7uyuyIBsXWApHqpR7Pgkac"
}
},
{
"sys": {
"type": "Link",
"linkType": "Entry",
"id": "4HILHPLjqQkP2H1hA2FeBG"
}
},
{
"sys": {
"type": "Link",
"linkType": "Entry",
"id": "QuwRHL3XMSkguqrL1hUzC"
}
},
{
"sys": {
"type": "Link",
"linkType": "Entry",
"id": "4ZyVef5oWhQWXK9V1lr3vz"
}
}
]
},
"layout": {
"en-US": "Wide"
}
}
I have 2 questions:
How can I delete deeper objects, eg. .entries.sys.space.sys.linkType?
How can I keep the .entries node in the outfile?
Thank you for your help.

Answer 1

If you want full control over the output, I'd just re-create the desired format.
It sounds like you're trying to accieve the following format:
{
"entries": [
{
"sys": {
"id": ...
},
"contentType": {
"sys": {
"id": ...
}
},
"fields": ...
}
}
]
}
We can achieve this by using the following JQ selector:
.entries |= map({ "sys": { "id": .sys.id }, "contentType": { "sys": { "id": .sys.contentType.sys.id } }, fields })
Try it online!