# Get a custom resolver

**GET /groups/{groupId}/apps/{appId}/graphql/custom_resolvers/{customResolverId}**

Get a specific [custom resolver](https://www.mongodb.com/zh-cn/docs/atlas/app-services/graphql/custom-resolvers/) configuration.


## Servers
- The root API resource and starting point for the App Services API.: https://services.cloud.mongodb.com/api/admin/v3.0 (The root API resource and starting point for the App Services API.)


## Authentication methods
- Token auth


## Parameters

### Path parameters
- **groupId** (string)
  An Atlas [Project/Group
  ID](https://docs.atlas.mongodb.com/tutorial/manage-projects/).
- **appId** (string)
  The ObjectID of your application.
  [The App Services API Project and Application IDs section](#section/Project-and-Application-IDs) demonstrates how to find this
  value.
- **customResolverId** (string)
  The unique `_id` value of a custom resolver.



## Responses
### 200
OK

#### Body: application/json (object)
- **on_type** (string)
  The name of the resolver's parent type. This can be
  `"Query"`, `"Mutation"`, or the name of a generated type if
  this is a computed property.
- **field_name** (string)
  The name of the custom resolver field that appears in the GraphQL schema.
- **input_type** (string | object)
  The type of the custom resolver's `input` parameter. This
  can be a scalar, the name of an existing generated type, or
  a custom JSON schema object. If undefined, the resolver does
  not accept an input.
- **input_type_format** (string)
  The kind of input type the custom resolver uses. This value
  must agree with the value of `input_type`:

  - A scalar input type must use `"scalar"` or `"scalar-list"`
  - A generated input type must use `"generated"` or `"generated-list"`
  - A custom input type must use `"custom"`

  If undefined, the resolver does not accept an input.
- **payload_type** (string | object)
  The type of the value returned by the custom resolver. This
  can be a scalar, the name of an existing generated type, or
  a custom JSON schema object.

  If undefined, the resolver returns a `DefaultPayload`
  object:

  ```graphql
  type DefaultPayload {
    status: String!
  }
  ```
- **payload_type_format** (string)
  The kind of payload type the custom resolver uses. This value
  must agree with the value of `payload_type`:

  - A scalar payload type must use `"scalar"` or `"scalar-list"`
  - A generated payload type must use `"generated"` or `"generated-list"`
  - A custom payload type must use `"custom"`

  If undefined, the resolver returns a `DefaultPayload` object.
- **_id** (string)
  The custom resolver's unique ID.
- **function_id** (string)
  The resolver function's unique ID.


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