"No query string was present" Error Using Postman

I am trying to execute an API v2 query using Postman as discussed in this excellent video (see 42:30):

My Body in Postman is as follows:

{"query" : "{boards (ids:2319318210){id name items{id name}}}"}

But I get this error:

{
    "errors": [
        {
            "message": "No query string was present"
        }
    ],
    "account_id": xxxxxxx
}

However I am able to successfully execute the equivalent query in the Monday.com API playground:

query {
  boards (ids:xxxxxxxxxx){
    id
    name
    items {
      id name
    }
  }
}

What do I need to change in my Postman query for this to work?

Problem solved

Postman apparently changed since the video was made

The format for the query is simpler. Plus you have to check GraphQL instead of Raw:

query {
boards (ids:xxxxxxxxxx){id name items {id name}}
}