GitHub

GitHub Markdown API

The GitHub Markdown API is a REST service that converts Markdownespecially GitHub Flavored Markdowninto the same HTML GitHub renders in READMEs, issues, and pull requests, so external apps can display content consistently with GitHub.

GitHub OpenAPI

Operations 2

Each operation below carries the questions people ask an LLM about it and the instructions they give an agent to run it. Generated by API Evangelist overlay

POST /markdown Render Markdown to HTML · GitHub Render a Markdown Document #
Ask an LLM
“How do I turn Markdown into HTML the same way GitHub displays it?”
“Can issue references like #42 link to the right repository when I render GitHub Flavored Markdown?”
Tell an agent
Render {text} as HTML.
Render {text} in {mode} mode with repository context {context}.
POST /markdown/raw Render plain-text Markdown like a README · GitHub Render a Markdown Document in Raw Mode #
Ask an LLM
“Can I send Markdown as plain text instead of JSON and get HTML back?”
“What's the size limit for rendering a raw Markdown document without GitHub Flavored extensions?”
Tell an agent
Render this plain-text Markdown file in raw mode, the way a README displays.
Post my Markdown as text/plain and return raw-mode HTML.

Documentation

📖
Documentation
https://docs.github.com/en/rest/markdown

Specifications

⚙
OpenAPI
https://raw.githubusercontent.com/api-evangelist/github/refs/heads/main/openapi/github-markdown-api-openapi.yml

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OpenAPI Specification

github-markdown-api-openapi.yml Raw ↑ 
openapi: 3.2.0
info:
  version: 1.1.4
  title: GitHub v3 REST Markdown API
  description: GitHub's v3 REST API.
  license:
    name: MIT
    url: https://spdx.org/licenses/MIT
  termsOfService: https://docs.github.com/articles/github-terms-of-service
  contact:
    name: Support
    url: https://support.github.com/contact?tags=dotcom-rest-api
  x-github-plan: ghes
  x-github-release: 3.9
servers:
- url: '{protocol}://{hostname}/api/v3'
  variables:
    hostname:
      description: Self-hosted Enterprise Server hostname
      default: HOSTNAME
    protocol:
      description: Self-hosted Enterprise Server protocol
      default: http
tags:
- name: Markdown
  description: Render GitHub flavored markdown
paths:
  /markdown:
    post:
      summary: GitHub Render a Markdown Document
      description: ''
      operationId: markdown/render
      tags:
      - Markdown
      externalDocs:
        description: API method documentation
        url: https://docs.github.com/enterprise-server@3.9/rest/markdown/markdown#render-a-markdown-document
      parameters: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              properties:
                text:
                  description: The Markdown text to render in HTML.
                  type: string
                mode:
                  description: The rendering mode.
                  enum:
                  - markdown
                  - gfm
                  default: markdown
                  example: markdown
                  type: string
                context:
                  description: The repository context to use when creating references in `gfm` mode.  For example, setting `context` to `octo-org/octo-repo` will change the text `#42` into an HTML link to issue 42 in the `octo-org/octo-repo` repository.
                  type: string
              required:
              - text
              type: object
            examples:
              default:
                summary: Rendering markdown
                value:
                  text: Hello **world**
      responses:
        '200':
          description: Response
          headers:
            Content-Type:
              $ref: '#/components/headers/content-type'
            Content-Length:
              example: '279'
              schema:
                type: string
            X-CommonMarker-Version:
              $ref: '#/components/headers/x-common-marker-version'
          content:
            text/html:
              schema:
                type: string
              examples:
                default:
                  summary: Example response
                  value: <p>Hello <strong>world</strong></p>
        '304':
          $ref: '#/components/responses/not_modified'
      x-github:
        githubCloudOnly: false
        enabledForGitHubApps: true
        category: markdown
        subcategory: markdown
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
  /markdown/raw:
    post:
      summary: GitHub Render a Markdown Document in Raw Mode
      description: You must send Markdown as plain text (using a `Content-Type` header of `text/plain` or `text/x-markdown`) to this endpoint, rather than using JSON format. In raw mode, GitHub Flavored Markdown is not supported and Markdown will be rendered in plain format like a README.md file. Markdown content must be 400 KB or less.
      operationId: markdown/render-raw
      tags:
      - Markdown
      externalDocs:
        description: API method documentation
        url: https://docs.github.com/enterprise-server@3.9/rest/markdown/markdown#render-a-markdown-document-in-raw-mode
      parameters: []
      requestBody:
        required: false
        content:
          text/plain:
            schema:
              type: string
            examples:
              default:
                value:
                  text: Hello **world**
          text/x-markdown:
            schema:
              type: string
            examples:
              default:
                summary: Rendering markdown
                value:
                  text: Hello **world**
      responses:
        '200':
          description: Response
          headers:
            X-CommonMarker-Version:
              $ref: '#/components/headers/x-common-marker-version'
          content:
            text/html:
              schema:
                type: string
              examples:
                default:
                  summary: Example response
                  value: <p>Hello <strong>world</strong></p>
        '304':
          $ref: '#/components/responses/not_modified'
      x-github:
        githubCloudOnly: false
        enabledForGitHubApps: true
        category: markdown
        subcategory: markdown
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
components:
  responses:
    not_modified:
      description: Not modified
  headers:
    x-common-marker-version:
      example: 0.17.4
      schema:
        type: string
    content-type:
      example: text/html
      schema:
        type: string
externalDocs:
  description: GitHub Enterprise Developer Docs
  url: https://docs.github.com/enterprise-server@3.9/rest/