# Execute a function's source code for testing

**POST /groups/{groupId}/apps/{appId}/debug/execute_function_source**

Execute a [function](https://www.mongodb.com/ko-kr/docs/atlas/app-services/functions/)'s source code
for testing.


## 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.

### Query parameters
- **user_id** (string)
  The user as which to execute the function. Either `user_id` or
  `run_as_system` is required. You cannot specify both.
- **run_as_system** (boolean)
  Determine whether or not to run as system user. Either `run_as_system`
  or `user_id` is required. You cannot specify both.

### Body: application/json (object)
The source to execute.
- **eval_source** (string)
  This JSON expression must evaluate to `true` before the function may
  run. If this field is blank, it will evaluate to `true`.
- **source** (string)



## Responses
### 200
Successfully executed.

#### Body: application/json (object)
- **error** (object)

- **result** (object)

- **stats** (object)



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