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

POST /v1/identity/initialize-login — openapi

Initiates identifier-first login flow by returning a list of login methods for user(s).

Endpoint

Method: POST

Path: /v1/identity/initialize-login

Servers:

• https://auth.roblox.com

Request Body

{
  "content": {
    "application/json": {
      "schema": {
        "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.Request.InitializeLoginRequest"
      }
    },
    "text/json": {
      "schema": {
        "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.Request.InitializeLoginRequest"
      }
    }
  },
  "required": true
}

Responses

{
  "200": {
    "description": "OK",
    "content": {
      "application/json": {
        "schema": {
          "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.Response.InitializeLoginResponse"
        }
      },
      "text/json": {
        "schema": {
          "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.Response.InitializeLoginResponse"
        }
      }
    }
  },
  "400": {
    "description": "3: User identifier and type are required."
  },
  "403": {
    "description": "0: Token Validation Failed\r\n2: Invalid user identifier.\r\n4: No login methods available. Please use account recovery."
  },
  "500": {
    "description": "0: An unknown error occurred."
  },
  "503": {
    "description": "1: This feature is disabled."
  }
}

Authentication

{
  "security": [
    {}
  ],
  "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.Request.InitializeLoginRequest

• Roblox.Authentication.Api.Models.Response.InitializeLoginResponse

Complete Operation Definition

{
  "tags": [
    "Accounts"
  ],
  "summary": "Initiates identifier-first login flow by returning a list of login methods for user(s).",
  "requestBody": {
    "content": {
      "application/json": {
        "schema": {
          "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.Request.InitializeLoginRequest"
        }
      },
      "text/json": {
        "schema": {
          "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.Request.InitializeLoginRequest"
        }
      }
    },
    "required": true
  },
  "responses": {
    "200": {
      "description": "OK",
      "content": {
        "application/json": {
          "schema": {
            "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.Response.InitializeLoginResponse"
          }
        },
        "text/json": {
          "schema": {
            "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.Response.InitializeLoginResponse"
          }
        }
      }
    },
    "400": {
      "description": "3: User identifier and type are required."
    },
    "403": {
      "description": "0: Token Validation Failed\r\n2: Invalid user identifier.\r\n4: No login methods available. Please use account recovery."
    },
    "500": {
      "description": "0: An unknown error occurred."
    },
    "503": {
      "description": "1: This feature is disabled."
    }
  },
  "servers": [
    {
      "url": "https://auth.roblox.com"
    }
  ],
  "x-roblox-engine-usability": {
    "apiKeyWithHttpService": false
  },
  "security": [
    {}
  ],
  "externalDocs": {
    "url": "https://create.roblox.com/docs/cloud/reference/features/accounts#auth_post_v1_identity_initialize_login"
  }
}