How can I parse nested JSON in PowerShell? - json

Question

I'm trying to parse the results of a cURL command and the information I need is in a structure.
I tried getting to the data unsuccessfully and tried converting to PS Object but not sure how to access the structure as I'm new to PS.
Below is a sample of our cURL response.
I have a git commit hash ('c64a568399a572e82c223d55cb650b87ea1c22b8' matches latestCommit in fromRef for entry id 1101) and I need to find the corresponding displayId ('develop' in toRef)
I've done this in Linux using jq but need to replicate this in PS.
jq '.values | map(select(.fromRef.latestCommit=="'"$HASH"'")) | .[0].toRef.displayId'
I'm having 2 issues.
I can get to fromRef but it looks like #{id=refs/heads/feature/add-support; displayId=feature/add-support; latestCommit=c64a568399a572e82c223d55cb650b87ea1c22b8; repository=} and I cannot figure out how to parse
I'm not sure how to get the id so I can find the correct corresponding toRef
Any help would be greatly appreciated.
{
"size": 15,
"limit": 20,
"isLastPage": true,
"values": [
{
"id": 1101,
"version": 0,
"title": "Added header",
"description": "Added notes in header",
"state": "OPEN",
"open": true,
"closed": false,
"createdDate": 1595161367863,
"updatedDate": 1595161367863,
"fromRef": "#{id=refs/heads/feature/add-support; displayId=feature/add-support; latestCommit=c64a568399a572e82c223d55cb650b87ea1c22b8; repository=}",
"toRef": "#{id=refs/heads/develop; displayId=develop; latestCommit=58b3e3482bb35f3a735048849c2474cc676fbd9b; repository=}",
"locked": false,
"author": "#{user=; role=AUTHOR; approved=False; status=UNAPPROVED}",
"reviewers": " ",
"participants": "",
"properties": "#{mergeResult=; resolvedTaskCount=0; openTaskCount=0}",
"links": "#{self=System.Object[]}"
},
{
"id": 1053,
"version": 4,
"title": "Help with checking,",
"description": "fixed up code.",
"state": "OPEN",
"open": true,
"closed": false,
"createdDate": 1591826401310,
"updatedDate": 1595018917357,
"fromRef": "#{id=refs/heads/bugfix/checking-2.7; displayId=bugfix/checking-2.7; latestCommit=cf7d8860262c6a46b0b65ef5b6d66ae8cd698b75; repository=}",
"toRef": "#{id=refs/heads/hotfix/2.7_Improvements; displayId=hotfix/2.7_Improvements; latestCommit=01f1100c559ba41ec317421399c3bfb9a0aea91f; repository=}",
"locked": false,
"author": "#{user=; role=AUTHOR; approved=False; status=UNAPPROVED}",
"reviewers": " ",
"participants": "",
"properties": "#{mergeResult=; resolvedTaskCount=0; commentCount=4; openTaskCount=0}",
"links": "#{self=System.Object[]}"
}
],
"start": 0
}

Answer 1

Once you have converted the result with ConvertTo-Json and the correct -Depth parameter, you can get the values of the returned object quite easily in PowerShell.
Let's say you have used something like $json = $curlResult | ConvertTo-Json -Depth 100, then finding the displayId from the corresponding toRef can be done like this:
# this is the known hashvalue of the `fromRef` value to look for
$latestCommitHash = "c64a568399a572e82c223d55cb650b87ea1c22b8"
# get the value item. from here you can get all other properties belonging to that item
$valueItem = $json.values | Where-Object { $_.fromRef.latestCommit -eq $latestCommitHash }
# get the displayId value of the corresponding 'toRef' element:
$displayId = $valueItem.toRef.displayId
Returns
develop