Introspection

A GraphQL server supports introspection over its schema. This schema is queried using GraphQL itself, creating a powerful platform for tool‐building.

Take an example query for a trivial app. In this case there is a User type with three fields: id, name, and birthday.

For example, given a server with the following type definition:

type User {
  id: String
  name: String
  birthday: Date
}

The query

{
  __type(name: "User") {
    name
    fields {
      name
      type {
        name
      }
    }
  }
}

would return

{

"__type"
: {

"name"
: 
"User"
,

"fields"
: [
      {

"name"
: 
"id"
,

"type"
: { 
"name"
: 
"String"
 }
      },
      {

"name"
: 
"name"
,

"type"
: { 
"name"
: 
"String"
 }
      },
      {

"name"
: 
"birthday"
,

"type"
: { 
"name"
: 
"Date"
 }
      },
    ]
  }
}