openapi: 3.1.0
info:
  title: Trello REST Actions Checklists API
  description: The Trello REST API provides programmatic access to Trello boards, lists, cards, members, labels, checklists, and other resources that make up the Trello project management platform. Developers can create, read, update, and delete Trello objects, manage team collaboration workflows, and automate task management processes. The API uses key and token based authentication and returns JSON responses for all endpoints.
  version: '1'
  contact:
    name: Atlassian Developer Support
    url: https://developer.atlassian.com/support
  termsOfService: https://www.atlassian.com/legal/cloud-terms-of-service
servers:
- url: https://api.trello.com/1
  description: Trello API v1 Production Server
security:
- apiKey: []
  apiToken: []
tags:
- name: Checklists
  description: Operations for creating, retrieving, updating, and deleting checklists and their check items on cards.
paths:
  /checklists:
    post:
      operationId: createChecklist
      summary: Create a Checklist
      description: Creates a new checklist, optionally on a specific card.
      tags:
      - Checklists
      parameters:
      - name: idCard
        in: query
        required: true
        description: The ID of the card the checklist should be on.
        schema:
          type: string
      - name: name
        in: query
        description: The name of the checklist.
        schema:
          type: string
      - name: pos
        in: query
        description: The position of the checklist on the card.
        schema:
          type: string
          default: bottom
      - name: idChecklistSource
        in: query
        description: The ID of a source checklist to copy.
        schema:
          type: string
      responses:
        '200':
          description: Successfully created the checklist.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Checklist'
        '400':
          description: Bad request.
        '401':
          description: Unauthorized.
  /checklists/{id}:
    get:
      operationId: getChecklist
      summary: Get a Checklist
      description: Retrieves a single checklist by its identifier.
      tags:
      - Checklists
      parameters:
      - $ref: '#/components/parameters/idParam'
      - name: cards
        in: query
        description: Filter cards to include.
        schema:
          type: string
          enum:
          - all
          - closed
          - none
          - open
          - visible
          default: none
      - name: checkItems
        in: query
        description: Whether to include check items.
        schema:
          type: string
          enum:
          - all
          - none
          default: all
      - name: checkItem_fields
        in: query
        description: A comma-separated list of check item fields to return.
        schema:
          type: string
          default: name,nameData,pos,state,due,dueReminder,idMember
      - name: fields
        in: query
        description: A comma-separated list of checklist fields to return.
        schema:
          type: string
          default: all
      responses:
        '200':
          description: Successfully retrieved the checklist.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Checklist'
        '401':
          description: Unauthorized.
        '404':
          description: Checklist not found.
    put:
      operationId: updateChecklist
      summary: Update a Checklist
      description: Updates a checklist's name or position.
      tags:
      - Checklists
      parameters:
      - $ref: '#/components/parameters/idParam'
      - name: name
        in: query
        description: The new name for the checklist.
        schema:
          type: string
      - name: pos
        in: query
        description: The new position for the checklist.
        schema:
          type: string
      responses:
        '200':
          description: Successfully updated the checklist.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Checklist'
        '401':
          description: Unauthorized.
        '404':
          description: Checklist not found.
    delete:
      operationId: deleteChecklist
      summary: Delete a Checklist
      description: Permanently deletes a checklist.
      tags:
      - Checklists
      parameters:
      - $ref: '#/components/parameters/idParam'
      responses:
        '200':
          description: Successfully deleted the checklist.
        '401':
          description: Unauthorized.
        '404':
          description: Checklist not found.
  /checklists/{id}/checkItems:
    get:
      operationId: getChecklistCheckItems
      summary: Get Check Items on a Checklist
      description: Retrieves all check items on a checklist.
      tags:
      - Checklists
      parameters:
      - $ref: '#/components/parameters/idParam'
      - name: filter
        in: query
        description: Filter check items by state.
        schema:
          type: string
          enum:
          - all
          - none
          default: all
      - name: fields
        in: query
        description: A comma-separated list of check item fields to return.
        schema:
          type: string
          default: name,nameData,pos,state,due,dueReminder,idMember
      responses:
        '200':
          description: Successfully retrieved check items.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/CheckItem'
        '401':
          description: Unauthorized.
        '404':
          description: Checklist not found.
    post:
      operationId: createCheckItem
      summary: Create a Check Item on a Checklist
      description: Creates a new check item on a checklist.
      tags:
      - Checklists
      parameters:
      - $ref: '#/components/parameters/idParam'
      - name: name
        in: query
        required: true
        description: The name of the check item.
        schema:
          type: string
          minLength: 1
          maxLength: 16384
      - name: pos
        in: query
        description: The position of the check item in the checklist.
        schema:
          type: string
          default: bottom
      - name: checked
        in: query
        description: Whether the check item is initially checked.
        schema:
          type: boolean
          default: false
      - name: due
        in: query
        description: A due date for the check item.
        schema:
          type: string
          format: date-time
      - name: idMember
        in: query
        description: The ID of a member to assign to the check item.
        schema:
          type: string
      responses:
        '200':
          description: Successfully created the check item.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CheckItem'
        '400':
          description: Bad request.
        '401':
          description: Unauthorized.
        '404':
          description: Checklist not found.
  /checklists/{id}/checkItems/{idCheckItem}:
    get:
      operationId: getCheckItem
      summary: Get a Check Item on a Checklist
      description: Retrieves a specific check item on a checklist.
      tags:
      - Checklists
      parameters:
      - $ref: '#/components/parameters/idParam'
      - name: idCheckItem
        in: path
        required: true
        description: The ID of the check item.
        schema:
          type: string
      responses:
        '200':
          description: Successfully retrieved the check item.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CheckItem'
        '401':
          description: Unauthorized.
        '404':
          description: Checklist or check item not found.
    delete:
      operationId: deleteCheckItem
      summary: Delete a Check Item from a Checklist
      description: Removes a check item from a checklist.
      tags:
      - Checklists
      parameters:
      - $ref: '#/components/parameters/idParam'
      - name: idCheckItem
        in: path
        required: true
        description: The ID of the check item to delete.
        schema:
          type: string
      responses:
        '200':
          description: Successfully deleted the check item.
        '401':
          description: Unauthorized.
        '404':
          description: Checklist or check item not found.
components:
  parameters:
    idParam:
      name: id
      in: path
      required: true
      description: The ID of the resource.
      schema:
        type: string
  schemas:
    CheckItem:
      type: object
      description: Represents a single item in a checklist that can be checked or unchecked.
      properties:
        id:
          type: string
          description: The unique identifier for the check item.
        name:
          type: string
          description: The name of the check item.
        state:
          type: string
          description: The completion state of the check item.
          enum:
          - complete
          - incomplete
        idChecklist:
          type: string
          description: The ID of the checklist the check item belongs to.
        pos:
          type: number
          description: The position of the check item in the checklist.
        due:
          type: string
          format: date-time
          description: The due date for the check item.
        idMember:
          type: string
          description: The ID of the member assigned to the check item.
    Checklist:
      type: object
      description: Represents a checklist on a card, containing a list of check items that can be marked as complete or incomplete.
      properties:
        id:
          type: string
          description: The unique identifier for the checklist.
        name:
          type: string
          description: The name of the checklist.
        idBoard:
          type: string
          description: The ID of the board the checklist belongs to.
        idCard:
          type: string
          description: The ID of the card the checklist is on.
        pos:
          type: number
          description: The position of the checklist on the card.
        checkItems:
          type: array
          description: The check items in the checklist.
          items:
            $ref: '#/components/schemas/CheckItem'
  securitySchemes:
    apiKey:
      type: apiKey
      in: query
      name: key
      description: Your Trello API key, obtained from the Power-Ups admin page at https://trello.com/power-ups/admin.
    apiToken:
      type: apiKey
      in: query
      name: token
      description: A user token that grants access to Trello resources. Obtained by authorizing via the /1/authorize route or OAuth 1.0.
externalDocs:
  description: Trello REST API Documentation
  url: https://developer.atlassian.com/cloud/trello/rest/