https://mboxviewer.net

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    "title": "Mbox Viewer — Open & read MBOX files on Mac and Windows — fast and native",
    "excerpt": "Native mbox viewer for Mac and Windows. Open MBOX files from Thunderbird, Gmail / Google Takeout, Apple Mail and any client that exports standard mbox — up to 50+ GB, fully offline.",
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  "markdown": "[Now on the Mac App Store and Microsoft Store](https://apps.apple.com/app/mbox-viewer-pro/id6759237715)\n\n## Read MBOX files on Mac & Windows.\nAny size. Instantly.\n\nBack up your Gmail with Google Takeout and read it offline. Open, search and export emails from MBOX and EML archives — from a few KB to 50+ GB — without your computer breaking a sweat.\n\n[Download on the Mac App Store](https://apps.apple.com/app/mbox-viewer-pro/id6759237715) [Microsoft Store](https://apps.microsoft.com/store/detail/9NW3GVFG7DDB)\n\n[Try the online viewer](https://onlinemboxviewer.com/)\n\nmacOS 14+ · Apple Silicon · Windows 10/11 and Windows Server\n\nNo Electron No Java No cloud 100% offline Read-only\n\n## Built for one job, done right\n\n-   01\n\n    ### Your Gmail, offline on your computer\n\n    Use Google Takeout to back up your entire Gmail account, then read, search and browse it offline — no internet required, no account login.\n\n-   02\n\n    ### Other tools choke on large files\n\n    Most MBOX readers crash or freeze past a few hundred MB. Many ship a whole browser or JVM just to show a list of emails.\n\n-   03\n\n    ### Native, streaming, instant\n\n    Mbox Viewer streams through files of any size without loading them into memory. Truly native on Mac and Windows. Indexes once, re-opens in under a second.\n\n## Everything you need to live inside your email archive\n\nA focused, native toolset — not a web app in a window.\n\n### Handles any size\n\nStreaming parser with a 1 MB buffer opens files from a few KB to 50+ GB without loading them into RAM.\n\n### Instant re-opens\n\nA binary index with SHA-256 validation makes every re-open take under a second, whatever the file size.\n\n### Powerful search\n\nFull query syntax: from:, to:, subject:, body:, date:, has:attachment, size:>, OR, negation and exact phrases.\n\n### Gmail labels\n\nReads Gmail labels straight from Takeout. Browse by label in the sidebar with live message counts.\n\n### Full export\n\nExport to EML, CSV, plain text or extract every attachment. Merge multiple MBOX files with dedup.\n\n### Conversation threads\n\nThe JWZ threading algorithm groups messages into conversations with reply chains up to four levels deep.\n\n### Privacy first\n\nEverything runs locally. No cloud, no telemetry, no data ever leaves your computer. Strictly read-only.\n\n### Truly native\n\nNative on Mac and Windows — dark mode, drag & drop, system share and print. No Electron, no Java.\n\n### Repair damaged mailboxes\n\nDeep-scan recovery re-detects lost message boundaries and exports a repaired copy — the original file is never modified. (Pro)\n\n### Export to PDF\n\nExport any message to a self-contained, multi-page PDF with the same layout as printing. One message is free; batch export is Pro.\n\n### Export to HTML\n\nSave any message as a self-contained HTML file with images embedded and attachments as downloadable links — it opens anywhere. One message is free; batch is Pro.\n\n### Properties, MIME & Hex views\n\nThree new ways to inspect a message: a Properties panel, the MIME part tree and a raw hex dump — ideal for technical or forensic work.\n\n[See all features](https://mboxviewer.net/features/)\n\n## Works with your email client\n\nMbox Viewer reads the standard mbox format — the same format virtually every email client and service uses for exports and backups. If your app can export mbox, Mbox Viewer can open it. No import, no conversion, no account: just open the file.\n\nMozilla ThunderbirdGmail / Google TakeoutApple MailPostboxEudoraEntourageEvolutionClaws MailSeaMonkeyThe Bat!Opera MailSylpheedMuttNetscapeMozilla MailSpicebirdPocoMailMulberryPowerMailSparrowConeGNU MailOutlook for Mac (via converter) …and any client that exports standard mbox\n\nApple Mail and Thunderbird now open directly, with no extra steps. [Have Outlook (PST/OLM)? See how to convert it in our step-by-step guide.](https://mboxviewer.net/guides/convert-outlook-pst-olm-to-mbox/)\n\n## Available in 18 languages\n\nMbox Viewer's interface and user guide are localized into 18 languages, so you can work through your email in the one you know best.\n\n-   English\n-   Español\n-   Deutsch\n-   Français\n-   Italiano\n-   日本語\n-   한국어\n-   Nederlands\n-   Polski\n-   Português (BR)\n-   Português (PT)\n-   Русский\n-   Svenska\n-   Dansk\n-   Norsk\n-   Türkçe\n-   简体中文\n-   繁體中文\n\n## Opens a 50 GB archive in under 5 minutes\n\nAnd re-opens it in under a second — every time, thanks to the binary index.\n\n| File size | Messages | First open | Re-open | RAM |\n| --- | --- | --- | --- | --- |\n| 500 MB | ~5,000 | < 5 sec | < 1 sec | < 100 MB |\n| 5 GB | ~50,000 | < 30 sec | < 1 sec | < 200 MB |\n| 50 GB | ~500,000 | < 5 min | < 1 sec | < 600 MB |\n",
  "fullPageMarkdown": "Mbox Viewer — Open & read MBOX files on Mac and Windows — fast and native   [Skip to content](https://mboxviewer.net/#main)\n\n [![](https://mboxviewer.net/_astro/logo.DLJ_eWcW_ZRLesF.webp) Mbox Viewer](https://mboxviewer.net/)\n\nEnglish\n\n-   [English](https://mboxviewer.net/)\n-   [Español](https://mboxviewer.net/es/)\n-   [Deutsch](https://mboxviewer.net/de/)\n-   [Français](https://mboxviewer.net/fr/)\n-   [Português (BR)](https://mboxviewer.net/pt-br/)\n-   [日本語](https://mboxviewer.net/ja/)\n-   [Italiano](https://mboxviewer.net/it/)\n-   [Nederlands](https://mboxviewer.net/nl/)\n-   [한국어](https://mboxviewer.net/ko/)\n-   [Polski](https://mboxviewer.net/pl/)\n\nEnglish\n\n-   [English](https://mboxviewer.net/)\n-   [Español](https://mboxviewer.net/es/)\n-   [Deutsch](https://mboxviewer.net/de/)\n-   [Français](https://mboxviewer.net/fr/)\n-   [Português (BR)](https://mboxviewer.net/pt-br/)\n-   [日本語](https://mboxviewer.net/ja/)\n-   [Italiano](https://mboxviewer.net/it/)\n-   [Nederlands](https://mboxviewer.net/nl/)\n-   [한국어](https://mboxviewer.net/ko/)\n-   [Polski](https://mboxviewer.net/pl/)\n\nDownload\n\n-   [Mac App Store](https://apps.apple.com/app/mbox-viewer-pro/id6759237715)\n-   [Microsoft Store](https://apps.microsoft.com/store/detail/9NW3GVFG7DDB)\n\n[Mac](https://apps.apple.com/app/mbox-viewer-pro/id6759237715) [Windows](https://apps.microsoft.com/store/detail/9NW3GVFG7DDB)\n\n[Now on the Mac App Store and Microsoft Store](https://apps.apple.com/app/mbox-viewer-pro/id6759237715)# Read MBOX files on Mac & Windows.\nAny size. Instantly.\n\nBack up your Gmail with Google Takeout and read it offline. Open, search and export emails from MBOX and EML archives — from a few KB to 50+ GB — without your computer breaking a sweat.\n\n[Download on the Mac App Store](https://apps.apple.com/app/mbox-viewer-pro/id6759237715) [Microsoft Store](https://apps.microsoft.com/store/detail/9NW3GVFG7DDB)\n\n[Try the online viewer](https://onlinemboxviewer.com/)\n\nmacOS 14+ · Apple Silicon · Windows 10/11 and Windows Server\n\nmacOS Windows\n\n ![Mbox Viewer on macOS showing a three-column layout: message list, color-coded Gmail labels in the sidebar and a rendered HTML newsletter.](https://mboxviewer.net/_astro/screenshot-mbox-viewer.C55Od4qx_Z15OkrC.webp)\n\n ![Mbox Viewer on Windows showing a three-column layout: message list, color-coded labels in the sidebar and a rendered email.](https://mboxviewer.net/_astro/screenshot-mbox-viewer-windows.DLWLAtLt_27yKUp.webp)\n\nNo Electron No Java No cloud 100% offline Read-only\n\n## Built for one job, done right\n\n-   01\n\n    ### Your Gmail, offline on your computer\n\n    Use Google Takeout to back up your entire Gmail account, then read, search and browse it offline — no internet required, no account login.\n\n-   02\n\n    ### Other tools choke on large files\n\n    Most MBOX readers crash or freeze past a few hundred MB. Many ship a whole browser or JVM just to show a list of emails.\n\n-   03\n\n    ### Native, streaming, instant\n\n    Mbox Viewer streams through files of any size without loading them into memory. Truly native on Mac and Windows. Indexes once, re-opens in under a second.\n\n## Everything you need to live inside your email archive\n\nA focused, native toolset — not a web app in a window.\n\n### Handles any size\n\nStreaming parser with a 1 MB buffer opens files from a few KB to 50+ GB without loading them into RAM.\n\n### Instant re-opens\n\nA binary index with SHA-256 validation makes every re-open take under a second, whatever the file size.\n\n### Powerful search\n\nFull query syntax: from:, to:, subject:, body:, date:, has:attachment, size:>, OR, negation and exact phrases.\n\n### Gmail labels\n\nReads Gmail labels straight from Takeout. Browse by label in the sidebar with live message counts.\n\n### Full export\n\nExport to EML, CSV, plain text or extract every attachment. Merge multiple MBOX files with dedup.\n\n### Conversation threads\n\nThe JWZ threading algorithm groups messages into conversations with reply chains up to four levels deep.\n\n### Privacy first\n\nEverything runs locally. No cloud, no telemetry, no data ever leaves your computer. Strictly read-only.\n\n### Truly native\n\nNative on Mac and Windows — dark mode, drag & drop, system share and print. No Electron, no Java.\n\n### Repair damaged mailboxes\n\nDeep-scan recovery re-detects lost message boundaries and exports a repaired copy — the original file is never modified. (Pro)\n\n### Export to PDF\n\nExport any message to a self-contained, multi-page PDF with the same layout as printing. One message is free; batch export is Pro.\n\n### Export to HTML\n\nSave any message as a self-contained HTML file with images embedded and attachments as downloadable links — it opens anywhere. One message is free; batch is Pro.\n\n### Properties, MIME & Hex views\n\nThree new ways to inspect a message: a Properties panel, the MIME part tree and a raw hex dump — ideal for technical or forensic work.\n\n[See all features](https://mboxviewer.net/features/)\n\n## Works with your email client\n\nMbox Viewer reads the standard mbox format — the same format virtually every email client and service uses for exports and backups. If your app can export mbox, Mbox Viewer can open it. No import, no conversion, no account: just open the file.\n\nMozilla ThunderbirdGmail / Google TakeoutApple MailPostboxEudoraEntourageEvolutionClaws MailSeaMonkeyThe Bat!Opera MailSylpheedMuttNetscapeMozilla MailSpicebirdPocoMailMulberryPowerMailSparrowConeGNU MailOutlook for Mac (via converter) …and any client that exports standard mbox\n\nApple Mail and Thunderbird now open directly, with no extra steps. [Have Outlook (PST/OLM)? See how to convert it in our step-by-step guide.](https://mboxviewer.net/guides/convert-outlook-pst-olm-to-mbox/)\n\n## Available in 18 languages\n\nMbox Viewer's interface and user guide are localized into 18 languages, so you can work through your email in the one you know best.\n\n-   English\n-   Español\n-   Deutsch\n-   Français\n-   Italiano\n-   日本語\n-   한국어\n-   Nederlands\n-   Polski\n-   Português (BR)\n-   Português (PT)\n-   Русский\n-   Svenska\n-   Dansk\n-   Norsk\n-   Türkçe\n-   简体中文\n-   繁體中文\n\n## Opens a 50 GB archive in under 5 minutes\n\nAnd re-opens it in under a second — every time, thanks to the binary index.\n\n| File size | Messages | First open | Re-open | RAM |\n| --- | --- | --- | --- | --- |\n| 500 MB | ~5,000 | < 5 sec | < 1 sec | < 100 MB |\n| 5 GB | ~50,000 | < 30 sec | < 1 sec | < 200 MB |\n| 50 GB | ~500,000 | < 5 min | < 1 sec | < 600 MB |\n\n## Stop fighting your email backups\n\nFree for files up to 500 MB. Unlock unlimited size with a one-time in-app purchase. No subscription, no account.\n\n[Download on the Mac App Store](https://apps.apple.com/app/mbox-viewer-pro/id6759237715) [Microsoft Store](https://apps.microsoft.com/store/detail/9NW3GVFG7DDB)\n\nWe use analytics cookies to improve Mbox Viewer. You can accept or reject them — the site works the same either way. [Privacy](https://mboxviewer.net/privacy/)\n\nReject Accept\n",
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    }
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  "llmsTxtPreview": "# Mbox Viewer\n\n> Native mbox viewer for Mac and Windows. Open MBOX files from Thunderbird, Gmail / Google Takeout, Apple Mail and any client that exports standard mbox — up to 50+ GB, fully offline.\n\n## Documentation\n- [FAQ](https://mboxviewer.net/faq/)\n\n## Main\n- [Mbox Viewer — Open & read MBOX files on Mac and Windows — fast and native](https://mboxviewer.net): Native mbox viewer for Mac and Windows. Open MBOX files from Thunderbird, Gmail / Google Takeout, Apple Mail and any cl…\n- [Features](https://mboxviewer.net/features/)\n- [Mbox Viewer](https://mboxviewer.net/)\n- [Guides](https://mboxviewer.net/guides/)\n- [Compare](https://mboxviewer.net/compare/)\n- [Changelog](https://mboxviewer.net/changelog/)\n- [Español](https://mboxviewer.net/es/)\n- [Deutsch](https://mboxviewer.net/de/)\n- [Français](https://mboxviewer.net/fr/)\n- [Português (BR)](https://mboxviewer.net/pt-br/)\n\n## Blog\n- [Blog](https://mboxviewer.net/blog/)\n\n## Legal\n- [Privacy Policy](https://mboxviewer.net/privacy/)\n- [Terms of Service](https://mboxviewer.net/terms/)\n- [Refunds](https://mboxviewer.net/refund/)\n\n## Support\n- [FAQ](https://mboxviewer.net/faq/)\n- [Support](https://mboxviewer.net/support/)\n\n",
  "llmsTxtExisting": "# Mbox Viewer\n\n> Native mbox viewer for Mac and Windows. Open MBOX files from Thunderbird, Gmail / Google Takeout, Apple Mail and any client that exports standard mbox — up to 50+ GB, fully offline.\n\n## Key facts\n- Platform: macOS 14 Sonoma and later (Apple Silicon + Intel) and Windows 10/11 & Windows Server.\n- Distribution: Mac App Store and Microsoft Store. Free up to 500 MB; Pro (unlimited size) is a one-time in-app purchase. No subscription, no account, no web payments.\n- Privacy: 100% local, no cloud, no telemetry, strictly read-only.\n- Performance: opens a 50 GB MBOX in under 5 minutes; re-opens in under 1 second via a binary index.\n- Languages: the app's interface and user guide are localized into 18 languages (English, Español, Deutsch, Français, Italiano, 日本語, 한국어, Nederlands, Polski, Português (BR), Português (PT), Русский, Svenska, Dansk, Norsk, Türkçe, 简体中文, 繁體中文). The website is in 10 languages.\n- Based on the open-source terminal tool mboxShell (https://github.com/dcarrero/mboxshell).\n- Author: David Carrero Fernández-Baillo · Color Vivo Internet, S.L. (https://colorvivo.com).\n\n## Download\n- Mac App Store: https://apps.apple.com/app/mbox-viewer-pro/id6759237715\n- Microsoft Store: https://apps.microsoft.com/store/detail/9NW3GVFG7DDB\n\n## Pages\n- Home: https://mboxviewer.net/\n- Features: https://mboxviewer.net/features/\n- Compare: https://mboxviewer.net/compare/\n- Changelog: https://mboxviewer.net/changelog/\n- Guides: https://mboxviewer.net/guides/\n- Blog: https://mboxviewer.net/blog/\n- FAQ: https://mboxviewer.net/faq/\n- Glossary: https://mboxviewer.net/glossary/\n- mboxShell (open-source terminal tool this app is based on): https://mboxviewer.net/mboxshell/\n- Support: https://mboxviewer.net/support/\n\n## Guides\n- How to Export Gmail with Google Takeout (and Open It on Mac): https://mboxviewer.net/guides/how-to-export-gmail-with-google-takeout/\n- How to Open an MBOX File on Mac (Even Huge Ones): https://mboxviewer.net/guides/how-to-open-mbox-file-on-mac/\n- How to Convert MBOX to CSV, EML, and Text (and Extract Attachments): https://mboxviewer.net/guides/convert-mbox-to-csv-and-eml/\n- Mbox Viewer Search Syntax Cheat Sheet: https://mboxviewer.net/guides/search-syntax-cheat-sheet/\n- How to Open a Thunderbird MBOX File on Mac: https://mboxviewer.net/guides/how-to-open-thunderbird-mbox-on-mac/\n- How to Open an Apple Mail Export (.mbox Folder) on Mac: https://mboxviewer.net/guides/how-to-open-apple-mail-export-on-mac/\n- How to Open an MBOX File on Windows (Any Size): https://mboxviewer.net/guides/how-to-open-mbox-file-on-windows/\n- How to Open a Thunderbird MBOX File on Windows: https://mboxviewer.net/guides/how-to-open-thunderbird-mbox-on-windows/\n- How to Open a Gmail (Google Takeout) MBOX File on Windows: https://mboxviewer.net/guides/how-to-open-gmail-takeout-mbox-on-windows/\n- How to Open an Apple Mail Export (.mbox) on Windows: https://mboxviewer.net/guides/how-to-open-apple-mail-export-on-windows/\n- How to Convert Outlook PST/OLM to MBOX (Mac & Windows): https://mboxviewer.net/guides/convert-outlook-pst-olm-to-mbox/\n\n## Blog\n- What's New in Mbox Viewer 2.7.0: Faster, More Private, More Accessible: https://mboxviewer.net/blog/whats-new-in-mbox-viewer-2-7-0/\n- A Field Guide to Email Storage Formats: History, Anatomy and a Comparison: https://mboxviewer.net/blog/email-formats-history-and-anatomy/\n- MBOX, EML, PST, OLM: Email Archive Formats Explained: https://mboxviewer.net/blog/email-archive-formats-explained/\n- Reading Old Email Archives from Eudora, Entourage and Other Classic Clients on a Modern Mac: https://mboxviewer.net/blog/read-old-email-archives-on-modern-mac/\n- Why You Should Back Up Your Gmail Locally (and How): https://mboxviewer.net/blog/why-back-up-your-gmail/\n- Introducing Mbox Viewer: Open Any MBOX or EML File, Instantly: https://mboxviewer.net/blog/introducing-mbox-viewer/\n\n## Feeds (RSS)\n- Blog: https://mboxviewer.net/blog/rss.xml\n- Guides: https://mboxviewer.net/guides/rss.xml\n- Changelog: https://mboxviewer.net/changelog/rss.xml",
  "emergingProtocols": {
    "oauthProtectedResource": {
      "exists": false,
      "url": "https://mboxviewer.net/.well-known/oauth-protected-resource"
    },
    "oauthDiscovery": {
      "exists": false,
      "url": "https://mboxviewer.net/.well-known/oauth-authorization-server"
    },
    "mcpServerCard": {
      "exists": false,
      "url": "https://mboxviewer.net/.well-known/mcp/server-card.json",
      "draft": true
    },
    "a2aAgentCard": {
      "exists": false,
      "url": "https://mboxviewer.net/.well-known/agent-card.json"
    },
    "apiCatalog": {
      "exists": false,
      "url": "https://mboxviewer.net/.well-known/api-catalog"
    },
    "agentSkills": {
      "exists": false,
      "url": "https://mboxviewer.net/.well-known/agent-skills/index.json",
      "draft": true
    },
    "count": 0,
    "total": 6
  },
  "botAccess": {
    "probed": true,
    "bot": "OAI-SearchBot",
    "controlStatus": 200,
    "botStatus": 200,
    "discriminates": false,
    "refusedAsBot": false,
    "edge": "Cloudflare",
    "verifiable": false,
    "detail": "This origin answers OAI-SearchBot exactly as it answers any other client (200). No edge-level filtering of AI crawlers observed."
  },
  "snippets": [
    {
      "id": "add_content_signals",
      "title": "Add Content-Signal directives",
      "description": "Content-Signal tells AI agents how they may use your content. The canonical location is robots.txt, but you can also expose it as an HTTP header from any stack.",
      "language": "txt",
      "code": "User-agent: *\nContent-Signal: search=yes, ai-input=yes, ai-train=no",
      "filename": "/robots.txt",
      "stacks": [
        {
          "id": "robots",
          "label": "robots.txt",
          "language": "txt",
          "filename": "/robots.txt",
          "code": "User-agent: *\nContent-Signal: search=yes, ai-input=yes, ai-train=no"
        },
        {
          "id": "nginx",
          "label": "Nginx",
          "language": "nginx",
          "filename": "server block",
          "code": "# Inside your server { } block:\nadd_header Content-Signal \"search=yes, ai-input=yes, ai-train=no\" always;"
        },
        {
          "id": "apache",
          "label": "Apache",
          "language": "apache",
          "filename": ".htaccess",
          "code": "# In .htaccess (or VirtualHost):\nHeader set Content-Signal \"search=yes, ai-input=yes, ai-train=no\""
        },
        {
          "id": "wordpress",
          "label": "WordPress",
          "language": "php",
          "filename": "functions.php",
          "code": "<?php\n// In your theme's functions.php or a small mu-plugin\nadd_action('send_headers', function () {\n    header('Content-Signal: search=yes, ai-input=yes, ai-train=no');\n});\n\n// Optional: also append the directive to the dynamic robots.txt\nadd_filter('robots_txt', function ($output) {\n    return $output . \"\\nContent-Signal: search=yes, ai-input=yes, ai-train=no\\n\";\n}, 10, 1);"
        },
        {
          "id": "nextjs",
          "label": "Next.js",
          "language": "typescript",
          "filename": "middleware.ts",
          "code": "// middleware.ts (Next.js 13+ App Router or Pages Router)\nimport { NextResponse } from 'next/server';\nexport function middleware() {\n  const res = NextResponse.next();\n  res.headers.set(\n    'Content-Signal',\n    'search=yes, ai-input=yes, ai-train=no'\n  );\n  return res;\n}\nexport const config = { matcher: '/:path*' };"
        },
        {
          "id": "cloudflare",
          "label": "Cloudflare Workers",
          "language": "javascript",
          "filename": "worker.js",
          "code": "// Cloudflare Worker that proxies your origin and adds the header\nexport default {\n  async fetch(request, env, ctx) {\n    const res = await fetch(request);\n    const newRes = new Response(res.body, res);\n    newRes.headers.set(\n      'Content-Signal',\n      'search=yes, ai-input=yes, ai-train=no'\n    );\n    return newRes;\n  },\n};"
        },
        {
          "id": "express",
          "label": "Express / Fastify",
          "language": "javascript",
          "filename": "server.js",
          "code": "// Express\napp.use((req, res, next) => {\n  res.setHeader('Content-Signal', 'search=yes, ai-input=yes, ai-train=no');\n  next();\n});\n\n// Fastify\nfastify.addHook('onSend', (request, reply, payload, done) => {\n  reply.header('Content-Signal', 'search=yes, ai-input=yes, ai-train=no');\n  done();\n});"
        }
      ]
    },
    {
      "id": "add_markdown_negotiation",
      "title": "Support Markdown for Agents",
      "description": "Let AI agents request a clean Markdown version of any page via content negotiation, .md alternate URLs, link tags or Link headers.",
      "language": "html",
      "code": "<!-- Mechanism 3: link tag advertising the .md alternate -->\n<link rel=\"alternate\" type=\"text/markdown\" href=\"/page.md\">",
      "filename": "<head>",
      "stacks": [
        {
          "id": "html",
          "label": "HTML <head>",
          "language": "html",
          "filename": "<head>",
          "code": "<!-- Mechanism 3: link tag advertising the .md alternate -->\n<link rel=\"alternate\" type=\"text/markdown\" href=\"/page.md\">"
        },
        {
          "id": "express",
          "label": "Express",
          "language": "javascript",
          "filename": "server.js",
          "code": "// Mechanisms 1 + 4: content negotiation + Link header\napp.get('/page', (req, res) => {\n  res.setHeader('Vary', 'Accept');\n  res.setHeader('Link', '</page.md>; rel=\"alternate\"; type=\"text/markdown\"');\n  if ((req.headers.accept || '').includes('text/markdown')) {\n    res.type('text/markdown; charset=utf-8');\n    return res.send(renderMarkdown('page'));\n  }\n  res.render('page');\n});"
        },
        {
          "id": "fastify",
          "label": "Fastify",
          "language": "javascript",
          "filename": "server.js",
          "code": "// Mechanisms 1 + 4: content negotiation + Link header\nfastify.get('/page', async (req, reply) => {\n  reply.header('Vary', 'Accept');\n  reply.header('Link', '</page.md>; rel=\"alternate\"; type=\"text/markdown\"');\n  if ((req.headers.accept || '').includes('text/markdown')) {\n    return reply.type('text/markdown; charset=utf-8').send(renderMarkdown('page'));\n  }\n  return reply.view('/page.ejs');\n});"
        },
        {
          "id": "nextjs",
          "label": "Next.js",
          "language": "typescript",
          "filename": "app/page/route.ts",
          "code": "// Next.js App Router — Route Handler returning Markdown\nimport { NextRequest } from 'next/server';\nimport { renderMarkdown } from '@/lib/md';\nexport async function GET(req: NextRequest) {\n  const accept = req.headers.get('accept') || '';\n  if (accept.includes('text/markdown')) {\n    return new Response(await renderMarkdown('page'), {\n      headers: {\n        'Content-Type': 'text/markdown; charset=utf-8',\n        'Vary': 'Accept',\n      },\n    });\n  }\n  // Fall through to the page component\n  return new Response(null, { status: 404 });\n}"
        },
        {
          "id": "wordpress",
          "label": "WordPress",
          "language": "php",
          "filename": "functions.php",
          "code": "<?php\n// Mechanism 1: respond to Accept: text/markdown on the same URL\nadd_action('template_redirect', function () {\n    if (!is_singular()) return;\n    $accept = $_SERVER['HTTP_ACCEPT'] ?? '';\n    if (strpos($accept, 'text/markdown') === false) return;\n    header('Content-Type: text/markdown; charset=utf-8');\n    header('Vary: Accept');\n    $post = get_queried_object();\n    echo \"# \" . get_the_title($post) . \"\\n\\n\";\n    echo wp_strip_all_tags(apply_filters('the_content', $post->post_content));\n    exit;\n});"
        },
        {
          "id": "static",
          "label": "Hugo / Jekyll / Astro",
          "language": "txt",
          "filename": "static/page.md",
          "code": "# Mechanism 2: serve .md alongside .html\n# Hugo: place page.md in /static/ — built unchanged\n# Jekyll: drop page.md in /assets/ — copied as-is\n# Astro: src/pages/page.md.ts that exports a GET returning markdown\n\n# Then advertise with mechanism 3 in <head>:\n#   <link rel=\"alternate\" type=\"text/markdown\" href=\"/page.md\">"
        }
      ]
    }
  ]
}

Use our API to get this programmatically (coming soon)