3 min read

Source: Roblox Creator Hub · CC BY 4.0 · View source · Code samples: MIT Imported 2026-10-03. Formatting adapted for this site.

GET /v1/usernames/validate — openapi

Checks if a username is valid.

Endpoint

Method: GET

Path: /v1/usernames/validate

Servers:

• https://auth.roblox.com

Parameters

[
  {
    "in": "query",
    "name": "Username",
    "required": true,
    "schema": {
      "type": "string"
    }
  },
  {
    "in": "query",
    "name": "Birthday",
    "required": true,
    "schema": {
      "type": "string",
      "format": "date-time"
    }
  },
  {
    "in": "query",
    "name": "Context",
    "required": true,
    "schema": {
      "type": "integer",
      "format": "int32",
      "enum": [
        0,
        1,
        2
      ]
    }
  }
]

Responses

{
  "200": {
    "description": "OK",
    "content": {
      "application/json": {
        "schema": {
          "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.UsernameValidationResponse"
        }
      },
      "text/json": {
        "schema": {
          "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.UsernameValidationResponse"
        }
      }
    }
  },
  "400": {
    "description": "1: A valid username is required.\r\n2: A valid birthday or authenticated user is required."
  }
}

Authentication

{
  "security": [
    {},
    {
      "roblox-legacy-cookie": []
    }
  ],
  "securitySchemes": {
    "roblox-api-key": {
      "type": "apiKey",
      "description": "A configurable key that allows granular access to Roblox resources. See https://create.roblox.com/docs/cloud/auth/api-keys for more information.",
      "name": "x-api-key",
      "in": "header"
    },
    "roblox-legacy-cookie": {
      "type": "apiKey",
      "description": "A browser cookie that represents the identity of a Roblox user. DO NOT SHARE THIS. Sharing this will allow someone to log in as you and to steal your Robux and items. We do not recommend using cookies to call endpoints. When possible, use API keys with the x-api-key header or OAuth 2.0 instead for authentication.",
      "in": "cookie",
      "name": ".ROBLOSECURITY"
    },
    "roblox-oauth2": {
      "type": "oauth2",
      "description": "Build or authorize apps to access Roblox resources. See https://create.roblox.com/docs/cloud/auth/oauth2-overview for more information.",
      "flows": {
        "authorizationCode": {
          "authorizationUrl": "https://apis.roblox.com/oauth/v1/authorize",
          "tokenUrl": "https://apis.roblox.com/oauth/v1/token",
          "refreshUrl": "https://apis.roblox.com/oauth/v1/token",
          "scopes": {}
        }
      }
    }
  }
}

Related Schemas

• Roblox.Authentication.Api.Models.UsernameValidationResponse

Complete Operation Definition

{
  "tags": [
    "Accounts"
  ],
  "summary": "Checks if a username is valid.",
  "parameters": [
    {
      "in": "query",
      "name": "Username",
      "required": true,
      "schema": {
        "type": "string"
      }
    },
    {
      "in": "query",
      "name": "Birthday",
      "required": true,
      "schema": {
        "type": "string",
        "format": "date-time"
      }
    },
    {
      "in": "query",
      "name": "Context",
      "required": true,
      "schema": {
        "type": "integer",
        "format": "int32",
        "enum": [
          0,
          1,
          2
        ]
      }
    }
  ],
  "responses": {
    "200": {
      "description": "OK",
      "content": {
        "application/json": {
          "schema": {
            "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.UsernameValidationResponse"
          }
        },
        "text/json": {
          "schema": {
            "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.UsernameValidationResponse"
          }
        }
      }
    },
    "400": {
      "description": "1: A valid username is required.\r\n2: A valid birthday or authenticated user is required."
    }
  },
  "servers": [
    {
      "url": "https://auth.roblox.com"
    }
  ],
  "x-roblox-engine-usability": {
    "apiKeyWithHttpService": false
  },
  "security": [
    {},
    {
      "roblox-legacy-cookie": []
    }
  ],
  "externalDocs": {
    "url": "https://create.roblox.com/docs/cloud/reference/features/accounts#auth_get_v1_usernames_validate"
  }
}