> ## Documentation Index
> Fetch the complete documentation index at: https://docs.noisemaker.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Check whether a public username is available



## OpenAPI

````yaml /openapi.json get /api/v1/usernames/availability
openapi: 3.0.3
info:
  title: ai-cmo.dev Services API
  version: 1.0.0
servers: []
security: []
paths:
  /api/v1/usernames/availability:
    get:
      summary: Check whether a public username is available
      operationId: checkUsernameAvailability
      parameters:
        - name: username
          in: query
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/UsernameAvailability'
      security:
        - cookieAuth: []
components:
  schemas:
    UsernameAvailability:
      type: object
      properties:
        username:
          type: string
        available:
          type: boolean
        reason:
          type: string
          enum:
            - invalid
            - reserved
            - taken
            - brand_collision
            - email_taken
      required:
        - username
        - available
      additionalProperties: false
  securitySchemes:
    cookieAuth:
      type: apiKey
      in: cookie
      name: geo.session
      description: Signed HttpOnly browser session cookie

````