# How to query metadata with GraphQL API

Metadata are relevant information regarding the scope of data in the [GraphQL API](/en/documentation/devtools/graphql-api/overview/). They can help you understand the relationship and the utility of the request processes.

To check GraphQL API's metadata, follow the steps described on [How to query GraphQL requests on Postman](/en/documentation/products/guides/query-graphql-postman/) using the `https://api.azionapi.net/metrics/graphql` URL.

Then, on Postman’s GraphQL request code box, add the following **Introspection Query**:

```graphql
query introspectionQuery {
 __type(name: "Query") {
   name
   description
   fields {
       name
       description
       type {
           ofType {
               fields {
                   name
                   type {
                       name
                      }
                  }
              }
          }
      }
  }
}
```

Send your request. You’ll receive a response similar to this:

```json
{
   "data": {
       "__type": {
           "name": "Query",
           "description":  "Class responsible for gathering the queries from the datasets and returning them in the form of graphql schema to the Django view.",
           "fields": [
               {
         {
          "name": "dataStreamedMetrics",
          "description": "Data Streamed Metrics dataset query by Minute, Hour and Day with aggregate options.",
          "type": {
            "ofType": {
              "fields": [
                {
                  "name": "ts",
                  "type": {
                    "name": "CustomDateTime"
                  }
                },
                {
                  "name": "configurationId",
                  "type": {
                    "name": "String"
                  }
                },
                {
                  "name": "endpointType",
                  "type": {
                    "name": "String"
                  }
               },
               {
          "name": "httpMetrics",
          "description": "Http Metrics dataset query by Minute, Hour and Day with aggregate options.",
          "type": {
            "ofType": {
              "fields": [
                {
                  "name": "ts",
                  "type": {
                    "name": "CustomDateTime"
                  }
                },
                {
                  "name": "configurationId",
                  "type": {
                    "name": "String"
                  }
                },
                {
                  "name": "host",
                  "type": {
                    "name": "String"
                  }
                },
                {
                  "name": "requestMethod",
                  "type": {
                    "name": "String"
                  }
                                }
                            ]
                       }
                   }
               }
           ]
       }
   }
}
```

The API returns the following metadata:

- Datasets available to query, such as **dataStreamedMetrics** and **httpMetrics**.
- Available fields for each dataset query.
- Each type for returnable fields, such as **Int**, **String**, **DateTime**, and so on.

For more information on the available datasets with the GraphQL API, visit the [datasets documentation page](/en/documentation/devtools/graphql-api/features/#datasets).