query when object name is a URL - json

Question

I've written a JQ search that outputs the following, but I cannot work out how to get into the detail and extract specific information from this.
{
"https://www.example.org/rest/relation/node/recording/revision_uid": [
{
"_links": {
"self": {
"href": "https://www.example.org/user/37?_format=hal_json"
},
"type": {
"href": "https://www.example.org/rest/type/user/user"
}
},
"uuid": [
{
"value": "d40684cf-2321-42d2-9194"
}
]
}
],
"https://www.example.org/rest/relation/node/recording/uid": [
{
"_links": {
"self": {
"href": "https://www.example.org/user/37?_format=hal_json"
},
"type": {
"href": "https://www.example.org/rest/type/user/user"
}
},
"uuid": [
{
"value": "d40684cf-2321-42d2-9194"
}
],
"lang": "en"
}
],
"https://www.example.org/rest/relation/node/recording/field_category": [
{
"_links": {
"self": {
"href": "https://www.example.org/simplecategory?_format=hal_json"
},
"type": {
"href": "https://www.example.org/rest/type/taxonomy_term/tags"
}
},
"uuid": [
{
"value": "3fef93d5-926a-41aa-95cb"
}
]
}
],
"https://www.example.org/rest/relation/node/recording/field_part1_speaker": [
{
"_links": {
"self": {
"href": "https://www.example.org/by/speakername?_format=hal_json"
},
"type": {
"href": "https://www.example.org/rest/type/taxonomy_term/author"
}
},
"uuid": [
{
"value": "fb6c806f-fa6a-4aa0-89ef"
}
]
}
]
}
How do I write a query that returns 'https://www.example.org/simplecategory?_format=hal_json'?
And I'd then want a similar query that returns 'https://www.example.org/by/speakername?_format=hal_json'
So jq '._embedded' gets me the data above.
I've then tried various combinations to get to the value of https://www.example.org/rest/relation/node/recording/field_category.
- jq '._embedded.https://www.example.org/rest/relation/node/recording/field_category - but of course the URL has special characters in it.
jq .["https://www.example.org/rest/relation/node/recording/field_category"]
jq ."https://www.example.org/rest/relation/node/recording/field_category$"
I've also messed around with some of JQs built in functions, like flatten and to_entries, from_entries. I've also tried regular expressions but my efforts return Cannot iterate over null (null).

Answer 1

How do I write a query that returns 'https://www.example.org/simplecategory?_format=hal_json'?
If you want to specify the top-level key explicitly, the follow-on query would be:
.["https://www.example.org/rest/relation/node/recording/revision_uid"][]
| ._links.self.href
That is, the entire query would be:
._embedded
| .["https://www.example.org/rest/relation/node/recording/revision_uid"][]
| ._links.self.href
And I'd then want a similar query
An alternative to specifying the top-level key explicitly might be to select the href of interest from the array of all of them:
._embedded
| [.[][]._links.self.href]
This would yield:
[
"https://www.example.org/user/37?_format=hal_json",
"https://www.example.org/user/37?_format=hal_json",
"https://www.example.org/simplecategory?_format=hal_json",
"https://www.example.org/by/speakername?_format=hal_json"
]