Traverse JSON Schema in Powershell - json

Question

I'm trying to do some code-generation from JSON data. I'm getting some AWS backup data into a JSON file. I grab the first record and generate a json schema from that one line.
When I load the schema in Powershell, I can't enumerate the properties because they are deserialzed as primary properties, not as an array within "properties". This looks like a json schema thing where the list of properties is shown as an object list and not an array, but I'm not sure.
I'm guessing the Powershell JSON parser can't see an array there, so just makes them properties.
I really don't want to manually traverse the schema JSON to get the list of properties and their types.
schema.json
{
"$schema": "http://json-schema.org/draft-04/schema#",
"description": "",
"type": "object",
"properties": {
"definition": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
},
"calcDefFilters": {
"type": "object",
"properties": {
"l": {
"type": "array",
"uniqueItems": true,
"minItems": 1,
"items": {
"required": [],
"properties": {
"m": {
"type": "object",
"properties": {
"field": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
},
"value": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
},
"operator": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
}
},
"required": [
"field",
"value",
"operator"
]
}
}
}
}
},
"required": [
"l"
]
},
"calculationId": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
},
"calcDefParameters": {
"type": "object",
"properties": {
"l": {
"type": "array",
"uniqueItems": true,
"minItems": 1,
"items": {
"required": [],
"properties": {
"m": {
"type": "object",
"properties": {
"name": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
},
"value": {
"type": "object",
"properties": {
"n": {
"type": "string",
"minLength": 1
}
},
"required": [
"n"
]
},
"type": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
}
},
"required": [
"name",
"value",
"type"
]
}
}
}
}
},
"required": [
"l"
]
},
"runId": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
},
"type": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
},
"externalId": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
},
"dealVersionId": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
}
},
"required": [
"definition",
"calcDefFilters",
"calculationId",
"calcDefParameters",
"runId",
"type",
"externalId",
"dealVersionId"
]
}
This is what I get in Powershell:
[DBG]: PS C:\Scripts>> $prop
definition : #{type=object; properties=; required=System.Object[]}
calcDefFilters : #{type=object; properties=; required=System.Object[]}
calculationId : #{type=object; properties=; required=System.Object[]}
calcDefParameters : #{type=object; properties=; required=System.Object[]}
runId : #{type=object; properties=; required=System.Object[]}
type : #{type=object; properties=; required=System.Object[]}
externalId : #{type=object; properties=; required=System.Object[]}
dealVersionId : #{type=object; properties=; required=System.Object[]}
Thoughts?

Answer 1

Not sure it answer but you can do it like this :
$a = #"
{
"`$schema": "http://json-schema.org/draft-04/schema#",
"description": "",
"type": "object",
"properties": {
"definition": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
},
"calcDefFilters": {
"type": "object",
"properties": {
"l": {
"type": "array",
"uniqueItems": true,
"minItems": 1,
"items": {
"required": [],
"properties": {
"m": {
"type": "object",
"properties": {
"field": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
},
"value": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
},
"operator": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
}
},
"required": [
"field",
"value",
"operator"
]
}
}
}
}
},
"required": [
"l"
]
},
"calculationId": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
},
"calcDefParameters": {
"type": "object",
"properties": {
"l": {
"type": "array",
"uniqueItems": true,
"minItems": 1,
"items": {
"required": [],
"properties": {
"m": {
"type": "object",
"properties": {
"name": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
},
"value": {
"type": "object",
"properties": {
"n": {
"type": "string",
"minLength": 1
}
},
"required": [
"n"
]
},
"type": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
}
},
"required": [
"name",
"value",
"type"
]
}
}
}
}
},
"required": [
"l"
]
},
"runId": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
},
"type": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
},
"externalId": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
},
"dealVersionId": {
"type": "object",
"properties": {
"s": {
"type": "string",
"minLength": 1
}
},
"required": [
"s"
]
}
},
"required": [
"definition",
"calcDefFilters",
"calculationId",
"calcDefParameters",
"runId",
"type",
"externalId",
"dealVersionId"
]
}
"#
$b = $a | ConvertFrom-Json
$properties = $b.properties.Psobject.Members | where {$_.MemberType -eq 'NoteProperty'} | % {$_.Name}