generated: '2026-09-17'
method: searched
source: >-
  https://developer.atlassian.com/cloud/trello/guides/components/board-tile-component/,
  https://developer.atlassian.com/cloud/trello/guides/components/card-components/,
  https://developer.atlassian.com/cloud/trello/guides/embedding/embedding-boards/,
  https://developer.atlassian.com/cloud/trello/guides/embedding/embedding-cards/,
  https://developer.atlassian.com/cloud/trello/power-ups/client-library/,
  https://developer.atlassian.com/cloud/trello/guides/client-js/client-js-reference/
description: >-
  Trello's client-side surface is unusually large for a project-management API, and it is
  distinct from the REST SDK story: two loader libraries served from Atlassian CDNs, a set
  of drop-in embed components for putting live Trello objects into someone else's page, and
  a full iframe-bridge framework (Power-Ups) for putting someone else's UI into Trello.
  All of it is first-party and all of it is browser-only.
families:
  - name: Embed components
    docs: https://developer.atlassian.com/cloud/trello/guides/components/board-tile-component/
    description: >-
      Drop-in components that render a live Trello object inside a third-party page. These
      are the closest thing Trello has to a hosted UI element library.
    components:
      - name: Board Tile Component
        docs: https://developer.atlassian.com/cloud/trello/guides/components/board-tile-component/
        renders: A card-shaped tile representing a Trello board, with its background and title.
      - name: Card Component
        docs: https://developer.atlassian.com/cloud/trello/guides/components/card-components/
        renders: A live rendering of a single Trello card.
  - name: Embedding
    docs: https://developer.atlassian.com/cloud/trello/guides/embedding/embedding-boards/
    description: >-
      Documented markup for embedding whole Trello boards and individual cards into an
      external site, including oEmbed-style URL handling.
    components:
      - name: Embedding Boards
        docs: https://developer.atlassian.com/cloud/trello/guides/embedding/embedding-boards/
      - name: Embedding Cards
        docs: https://developer.atlassian.com/cloud/trello/guides/embedding/embedding-cards/
  - name: Power-Ups framework
    docs: https://developer.atlassian.com/cloud/trello/power-ups/
    description: >-
      The inverse direction — a sandboxed iframe framework that lets a third party render
      its own UI inside the Trello board: board buttons, card buttons, card badges, card
      detail sections, card back sections, custom fields and attachment sections. The
      client library brokers every interaction between the iframe and the Trello host page
      (t.get/t.set for per-scope storage, t.authorize for auth, t.popup/t.boardBar for
      chrome).
    loader:
      url: https://p.trellocdn.com/power-up.min.js
      unminified: https://p.trellocdn.com/power-up.js
      size_bytes: 353679
      probed: '2026-09-17'
      status: 200
      versioned: false
      note: >-
        The loader URL carries no version segment, so a Power-Up always loads whatever
        Trello is currently serving. Atlassian announced a rendering update to these
        components on 18 November 2025 and offered early access for testing, which is the
        only change-management signal available for an unpinnable dependency.
    reference: https://developer.atlassian.com/cloud/trello/power-ups/client-library/
  - name: client.js
    docs: https://developer.atlassian.com/cloud/trello/guides/client-js/getting-started-with-client-js/
    reference: https://developer.atlassian.com/cloud/trello/guides/client-js/client-js-reference/
    description: >-
      A browser wrapper around the REST API that also carries the authorization flow. Loaded
      from the API host with the API key in the query string; exposes a global Trello object
      with Trello.authorize(), Trello.get/post/put/delete helpers.
    loader:
      url: 'https://api.trello.com/1/client.js?key={APIKey}'
      size_bytes: 5891
      probed: '2026-09-17'
      status: 200
      versioned: false
      dependencies:
        - jQuery 3.x (documented as a required peer script tag)