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

# Create a canvas



## OpenAPI

````yaml /api/openapi.json post /api/v1/projects/{projectId}/canvases
openapi: 3.0.2
info:
  title: Melius API
  version: '1'
  description: >-
    The Melius REST API. Authenticate with an API key as a bearer token
    (`Authorization: Bearer mel_...`) and select the team to act on with the
    `x-team-id` header. Generations run through the same node + run pipeline as
    the app: create a node on a canvas, start a run, poll the run, then read the
    resulting version asset.
servers:
  - url: https://api.melius.com
security:
  - apiKey: []
    teamId: []
paths:
  /api/v1/projects/{projectId}/canvases:
    post:
      tags:
        - canvas
      summary: Create a canvas
      operationId: canvas.create
      parameters:
        - name: projectId
          in: path
          required: true
          schema:
            type: string
            format: uuid
      requestBody:
        description: Body
        content:
          application/json:
            schema:
              type: object
              properties:
                title:
                  type: string
                  maxLength: 500
      responses:
        '201':
          description: '201'
          content:
            application/json:
              schema:
                type: object
                properties:
                  id:
                    type: string
                    format: uuid
                  teamId:
                    type: string
                    format: uuid
                  projectId:
                    type: string
                    format: uuid
                  title:
                    type: string
                  nodeCount:
                    type: integer
                  sortOrder:
                    type: integer
                  worldConfig:
                    type: object
                    additionalProperties: {}
                  createdByUserId:
                    type: string
                    format: uuid
                    nullable: true
                  previewAssets:
                    type: array
                    items:
                      type: object
                      properties:
                        url:
                          type: string
                        mediaType:
                          type: string
                          enum:
                            - image
                            - video
                        thumbnailUrl:
                          type: string
                          nullable: true
                      required:
                        - url
                        - mediaType
                        - thumbnailUrl
                  createdAt:
                    type: string
                    format: date-time
                  updatedAt:
                    type: string
                    format: date-time
                required:
                  - id
                  - teamId
                  - projectId
                  - title
                  - nodeCount
                  - sortOrder
                  - worldConfig
                  - createdByUserId
                  - previewAssets
                  - createdAt
                  - updatedAt
        '401':
          description: Missing, invalid, expired, or revoked API key.
          content:
            application/json:
              schema:
                type: object
                properties:
                  statusCode:
                    type: integer
                  error:
                    type: string
                  message:
                    type: string
                required:
                  - statusCode
                  - message
        '403':
          description: The API key's user is not a member of the requested team.
          content:
            application/json:
              schema:
                type: object
                properties:
                  statusCode:
                    type: integer
                  error:
                    type: string
                  message:
                    type: string
                required:
                  - statusCode
                  - message
        '409':
          description: '409'
          content:
            application/json:
              schema:
                type: object
                properties:
                  message:
                    type: string
                required:
                  - message
        '429':
          description: Rate limit reached — retry after the `Retry-After` header.
          headers:
            Retry-After:
              description: Seconds to wait before retrying.
              schema:
                type: integer
          content:
            application/json:
              schema:
                type: object
                properties:
                  statusCode:
                    type: integer
                  error:
                    type: string
                  message:
                    type: string
                  retryAfterSeconds:
                    type: integer
                required:
                  - statusCode
                  - message
components:
  securitySchemes:
    apiKey:
      type: http
      scheme: bearer
      description: 'A Melius API key (`mel_...`), sent as `Authorization: Bearer <key>`.'
    teamId:
      type: apiKey
      in: header
      name: x-team-id
      description: The team (workspace) to act on. Defaults to the key's team when omitted.

````