CodePen

aid: codepen
name: CodePen
description: CodePen is a social development environment for front-end designers and developers, offering a browser-based
  playground for writing and sharing HTML, CSS, and JavaScript. The platform allows users to create "Pens" (interactive code
  snippets) and share them publicly or privately. CodePen provides developer-facing APIs including an Embed API for displaying
  Pens on external sites, a POST to Prefill API for programmatically opening the Pen editor with pre-populated code, Prefill
  Embeds for transforming existing code blocks into interactive sandboxes, and an oEmbed endpoint for standard embed discovery.
  The platform is widely used by educators, tutorial authors, and documentation teams who need live, interactive code examples
  embedded in external pages.
type: Index
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- Developer Tools
- Front-End Development
- Code Playground
- Embeds
- Education
url: https://raw.githubusercontent.com/api-evangelist/codepen/refs/heads/main/apis.yml
created: '2026-06-12'
modified: '2026-06-12'
specificationVersion: '0.19'
apis:
- aid: codepen:oembed
  name: CodePen oEmbed API
  description: Standard oEmbed endpoint that returns a rich embed payload (iframe HTML, thumbnail URL, author metadata) for
    any public CodePen Pen URL. Supports JSON and JSONP response formats and an optional height parameter.
  humanURL: https://blog.codepen.io/documentation/oembed/
  baseURL: https://codepen.io/api/oembed
  tags:
  - oEmbed
  - Embeds
  - Front-End Development
  properties:
  - type: Documentation
    url: https://blog.codepen.io/documentation/oembed/
- aid: codepen:embed
  name: CodePen Embed API
  description: Client-side JavaScript API for rendering and lazy-loading embedded Pens on external web pages. Uses the global
    window.__CPEmbed() function with data-* attributes on a .codepen div to control height, theme, default tab, animations,
    and zoom level. A __CodePenIFrameAddedToPage callback is available for post-embed hooks.
  humanURL: https://blog.codepen.io/documentation/embedded-pens/
  baseURL: https://public.codepenassets.com/embed/index.js
  tags:
  - Embeds
  - JavaScript
  - Front-End Development
  properties:
  - type: Documentation
    url: https://blog.codepen.io/documentation/embedded-pens/
- aid: codepen:post-to-prefill
  name: CodePen POST to Prefill API
  description: HTTP POST endpoint that accepts JSON-encoded code and configuration and opens a new (unsaved) Pen in the CodePen
    editor pre-populated with that content. Supports HTML, CSS, and JS content fields, preprocessor choices, external resources,
    and editor layout. No authentication is required.
  humanURL: https://blog.codepen.io/documentation/prefill/
  baseURL: https://codepen.io/pen/define/
  tags:
  - Front-End Development
  - Developer Tools
  properties:
  - type: Documentation
    url: https://blog.codepen.io/documentation/prefill/
- aid: codepen:prefill-embeds
  name: CodePen Prefill Embeds API
  description: Declarative embed API that transforms existing code blocks on a web page into live, interactive CodePen sandboxes
    without requiring users to navigate away. Code is supplied via data-prefill JSON attributes and pre elements; the embed
    script at public.codepenassets.com renders an isolated iFrame. Supports HTML, CSS, and JavaScript preprocessors, external
    stylesheets and scripts, and optional editable mode.
  humanURL: https://blog.codepen.io/documentation/prefill-embeds/
  baseURL: https://public.codepenassets.com/embed/index.js
  tags:
  - Embeds
  - Front-End Development
  - JavaScript
  properties:
  - type: Documentation
    url: https://blog.codepen.io/documentation/prefill-embeds/
common:
- type: Website
  url: https://codepen.io
- type: Documentation
  url: https://blog.codepen.io/documentation/
- type: GitHubOrganization
  url: https://github.com/codepen
- type: LinkedIn
  url: https://www.linkedin.com/company/codepen
- type: Blog
  url: https://blog.codepen.io
- type: Pricing
  url: https://codepen.io/pricing
- type: X
  url: https://twitter.com/CodePen
- type: Plans
  url: plans/codepen-plans-pricing.yml
- type: RateLimits
  url: rate-limits/codepen-rate-limits.yml
- type: FinOps
  url: finops/codepen-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com