# Validate username availability on target server

This function validates a system user for use on the target server.



  For more information about how this function works with other functions in the transfer and restore process, read our Guide to Transfer and Restore API Functions documentation.

Endpoint: GET /validate_system_user
Version: 11.134.0.5
Security: BasicAuth

## Query parameters:

  - `user` (string, required)
    The system username.
    Example: "username"

## Response 200 fields (application/json):

  - `data` (object)

  - `data.exists` (integer)
    Whether the username exists on the server.
*  — Exists.
*  — Does  exist.
    Enum: 0, 1

  - `data.reserved` (integer)
    Whether the username is reserved.
*  — Reserved.
*  —  reserved.
    Enum: 0, 1

  - `data.valid_for_new` (integer)
    Whether the system can use the username to create a new account.
*  — Usable.
*  — Unusable.
    Enum: 0, 1

  - `data.valid_for_transfer` (integer)
    Whether the username is valid for a transferred account, but not a new account.
*  — Valid for transfer, but  a new account.
*  — Invalid.
    Enum: 0, 1

  - `metadata` (object)

  - `metadata.command` (string)
    The method name called.
    Example: "validate_system_user"

  - `metadata.reason` (string)
    The reason the API function failed when the  field is . This field may display a success message when a function succeeds.
    Example: "OK"

  - `metadata.result` (integer)
    *  — Success.
*  — Failed. Check the reason field for more details.
    Enum: 0, 1

  - `metadata.version` (integer)
    The version of the API function.
    Example: 1