PowerShell GraphQL Mutation Parsing Error - powershell

Question

I'm querying the Monday API v2 (https://monday.com/developers/v2) I'm getting stuck in getting the PowerShell query to work, the script is below:
[Net.ServicePointManager]::SecurityProtocol = "tls12, tls11, tls"
$url = "https://api.monday.com/v2/"
$hdr = #{ }
$hdr.Add("Authorization", "redacted")
$hdr.Add("Content-Type", "application/json")
$bodytxt = '{"query":"mutation{change_column_value (board_id: 528033866, item_id: 574335355, column_id: \"status_1\", value: "{\"index\": 1}") {id}}"}'
$response = Invoke-WebRequest -Uri $url -Headers $hdr -Method Post -body $bodytxt
Write-Host $response
And it keeps returning
{"errors":[{"message":"Parse error on \": 1}\" (STRING) at [1, 110]","locations":[{"line":1,"column":110}]}],"account_id":5305133}
The mutation query in Postman works fine
change_column_value (board_id: 528033866, item_id: 574335355, column_id: "status_1", value: "{\"index\": 1}"){id}
}
I have tried working with what quotes are escaped, but I still haven't been able to get it to run succesfully. I was referencing the tips here https://www.reddit.com/r/PowerShell/comments/b9jasa/query_graphql_with_powershell/
Any thoughts on how to fix this error?
EDIT: Sorry forgot to add the current query (not mutation) that works fine through Powershell
$bodytxt = '{"query":"{ boards (ids: 528033866) { groups (ids: \"group_title\"){ items () { id name updates () { body } column_values () { id title value text } } title } } }"}'

Answer 1

The easiest way to create a GraphQL query is
create a hashtable with HERE-STRINGS
convert it to a JSON string with ConvertTo-Json.
$bodytxt = #{"query" = #'
mutation {
change_column_value(
board_id: 123123
item_id: 456456
column_id: "status1"
value: "{\"index\":1}"
) {
id
}
}
'#
} | ConvertTo-Json
White spaces inside #'...'# are optional.
reply to this comment
it should always work in the API call with the GraphQL?
I think it depends on services, but in most cases, yes. application/json is the GraphQL default content type for the request body.
and for monday.com
Be sure to use the application/json content type