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Integration Astro Static

PostHogOfficialCreated by PostHog

  • Skill
  • Tool integration
  • Data and AI
  • MIT
  • No issues found
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From the author

PostHog integration for static Astro sites using SSG
— the description by PostHog

AutoGineer summary

Written by AutoGineer from the skill’s own files, not by the author

This skill provides a structured approach to adding PostHog analytics, session replay, and error tracking to static Astro (SSG) applications. It emphasizes a modular implementation using a dedicated Astro component to manage the PostHog web snippet, ensuring proper initialization and avoiding common framework-specific issues like TypeScript errors during build time.

What it does

  • Provides a step-by-step workflow for PostHog integration
  • Defines a reusable posthog.astro component for initialization
  • Demonstrates user identification patterns for login flows
  • Shows how to capture custom events and track errors
  • Includes guidance on managing session resets during logout
  • Enforces best practices for environment variable usage

When to use it

  • When you need to add PostHog analytics to an Astro static site
  • When you want to implement session replay or error tracking in Astro
  • When you need a standardized pattern for user identification in Astro
  • When you are setting up a new Astro project and require analytics integration

Advantages

  • Prevents build-time errors using the is:inline directive
  • Promotes clean code through reusable component architecture
  • Ensures secure handling of project tokens via environment variables
  • Provides clear patterns for both frontend and backend correlation

Usage examples

“How do I initialize PostHog in my static Astro project?”
The agent will guide you to create a src/components/posthog.astro file using the is:inline directive to safely embed the PostHog snippet.
“How should I track user logins in my Astro app?”
The agent will show you how to use window.posthog.identify() and window.posthog.capture() within your login page logic.

Install

  1. Download the skill as a ZIP:

    https://mp-staging.autogineer.com/agent-skills/posthog/integration-astro-static/download

  2. Unzip it into the cross-client skills folder of your project:

    mkdir -p .agents/skills && unzip integration-astro-static.zip -d .agents/skills

Documentation by PostHog

PostHog integration for Astro (Static)

This skill helps you add PostHog analytics to Astro (Static) applications.

Workflow

Follow these steps in order to complete the integration:

  1. basic-integration-1.0-begin.md - PostHog Setup - Begin ← Start here

  2. basic-integration-1.1-edit.md - PostHog Setup - Edit

  3. basic-integration-1.2-revise.md - PostHog Setup - Revise

  4. basic-integration-1.3-conclude.md - PostHog Setup - Conclusion

Reference files

  • references/EXAMPLE.md - Astro (Static) example project code

  • references/astro.md - Astro - docs

  • references/identify-users.md - Identify users - docs

  • references/basic-integration-1.0-begin.md - PostHog setup - begin

  • references/basic-integration-1.1-edit.md - PostHog setup - edit

  • references/basic-integration-1.2-revise.md - PostHog setup - revise

  • references/basic-integration-1.3-conclude.md - PostHog setup - conclusion

The example project shows the target implementation pattern. Consult the documentation for API details.

Key principles

  • Environment variables: Always use environment variables for PostHog keys. Never hardcode them.

  • Minimal changes: Add PostHog code alongside existing integrations. Don't replace or restructure existing code.

  • Match the example: Your implementation should follow the example project's patterns as closely as possible.

Framework guidelines

  • Always use the is:inline directive on PostHog script tags to prevent Astro from processing them and causing TypeScript errors

  • Use PUBLIC_ prefix for client-side environment variables in Astro (e.g., PUBLIC_POSTHOG_PROJECT_TOKEN)

  • Create a posthog.astro component in src/components/ for reusable initialization across pages

  • Import the PostHog component in a Layout and wrap all pages with that layout

Identifying users

Identify users during login and signup events. Refer to the example code and documentation for the correct identify pattern for this framework. If both frontend and backend code exist, pass the client-side session and distinct ID using X-POSTHOG-DISTINCT-ID and X-POSTHOG-SESSION-ID headers to maintain correlation.

Error tracking

Add PostHog error tracking to relevant files, particularly around critical user flows and API boundaries.

Files

references/EXAMPLE.md

PostHog Astro (Static) Example Project

Repository: https://github.com/PostHog/context-mill Path: basics/astro-static

README.md

PostHog Astro Static Example

This is an Astro static site (SSG) example demonstrating PostHog integration with product analytics, session replay, and error tracking.

It uses the PostHog web snippet directly and shows how to:

  • Initialize PostHog in a static Astro site using a reusable component

  • Identify users after login

  • Track custom events from pages

  • Capture errors via posthog.captureException()

  • Reset PostHog state on logout

Features

  • Product analytics: Track login and burrito consideration events

  • Session replay: Enabled via PostHog snippet configuration

  • Error tracking: Manual error capture sent to PostHog

  • Simple auth flow: Demo login using localStorage

Getting started

1. Install dependencies
npm install
# or
pnpm install
2. Configure environment variables

Create a .env file in the project root:

PUBLIC_POSTHOG_PROJECT_TOKEN=your_posthog_project_token
PUBLIC_POSTHOG_HOST=https://us.i.posthog.com

Get your PostHog project token from your project settings in PostHog.

3. Run the development server
npm run dev
# or
pnpm dev

Open http://localhost:4321 in your browser.

Project structure

src/
  components/
    posthog.astro      # PostHog snippet with is:inline directive
    Header.astro       # Navigation + logout, calls posthog.reset()
  layouts/
    PostHogLayout.astro # Root layout that includes PostHog + Header
  lib/
    auth.ts            # Auth utilities (localStorage-based)
  pages/
    index.astro        # Login form, identifies user + captures 'user_logged_in'
    burrito.astro      # Burrito consideration demo, captures 'burrito_considered'
    profile.astro      # Profile + error tracking demo
  styles/
    global.css         # Global styles

Key integration points

PostHog initialization (src/components/posthog.astro)

The PostHog snippet is included as an inline script to prevent Astro from processing it:

<script is:inline>
  !function(t,e){...}(document,window.posthog||[]);
  posthog.init('<ph_project_token>', {
    api_host: 'https://us.i.posthog.com',
    defaults: '2026-01-30'
  })
</script>

The is:inline directive is required to prevent TypeScript errors about window.posthog.

User identification (src/pages/index.astro)

After a successful "login", the app identifies the user and captures a login event:

window.posthog?.identify(username);
window.posthog?.capture("user_logged_in");

Identification happens only on login, all further requests will automatically use the same distinct ID.

Event tracking (src/pages/burrito.astro)

The burrito page tracks a custom event when a user "considers" the burrito:

window.posthog?.capture("burrito_considered", {
  total_considerations: newCount,
  username: currentUser,
});

This shows how to attach useful properties to events (e.g. counts, usernames).

Error tracking (src/pages/profile.astro)

The profile page includes a button to trigger a test error:

try {
  throw new Error("Test error for PostHog error tracking");
} catch (err) {
  window.posthog?.captureException(err);
}
Logout and session reset (src/components/Header.astro)

On logout, both the local auth state and PostHog state are cleared:

window.posthog?.capture("user_logged_out");
localStorage.removeItem("currentUser");
window.posthog?.reset();

posthog.reset() clears the current distinct ID and session so the next login starts a fresh identity.

Scripts

# Run dev server
npm run dev

# Build for production
npm run build

# Preview production build
npm run preview

Learn more

.env.example

PUBLIC_POSTHOG_PROJECT_TOKEN=your_posthog_project_token_here
PUBLIC_POSTHOG_HOST=https://us.i.posthog.com

astro.config.mjs

import { defineConfig } from "astro/config";

export default defineConfig({});

src/components/Header.astro

---
// Header component with navigation and logout functionality
---
<header class="header">
  <div class="header-container">
    <nav>
      <a href="/">Home</a>
      <a href="/burrito" class="auth-link" style="display: none;">Burrito Consideration</a>
      <a href="/profile" class="auth-link" style="display: none;">Profile</a>
    </nav>
    <div class="user-section">
      <span class="welcome-text" style="display: none;">Welcome, <span class="username"></span>!</span>
      <span class="not-logged-in">Not logged in</span>
      <button class="btn-logout" style="display: none;">Logout</button>
    </div>
  </div>
</header>

<script is:inline>
  function updateHeader() {
    const currentUser = localStorage.getItem('currentUser');
    const authLinks = document.querySelectorAll('.auth-link');
    const welcomeText = document.querySelector('.welcome-text');
    const notLoggedIn = document.querySelector('.not-logged-in');
    const logoutBtn = document.querySelector('.btn-logout');
    const usernameSpan = document.querySelector('.username');

    if (currentUser) {
      authLinks.forEach(link => link.style.display = 'inline');
      welcomeText.style.display = 'inline';
      notLoggedIn.style.display = 'none';
      logoutBtn.style.display = 'inline';
      usernameSpan.textContent = currentUser;
    } else {
      authLinks.forEach(link => link.style.display = 'none');
      welcomeText.style.display = 'none';
      notLoggedIn.style.display = 'inline';
      logoutBtn.style.display = 'none';
    }
  }

  function handleLogout() {
    const currentUser = localStorage.getItem('currentUser');
    if (currentUser) {
      window.posthog?.capture('user_logged_out');
    }
    localStorage.removeItem('currentUser');
    localStorage.removeItem('burritoConsiderations');
    // IMPORTANT: Reset the PostHog instance to clear the user session
    window.posthog?.reset();
    window.location.href = '/';
  }

  document.addEventListener('DOMContentLoaded', () => {
    updateHeader();
    document.querySelector('.btn-logout')?.addEventListener('click', handleLogout);
  });

  // Listen for storage changes (login/logout in other tabs)
  window.addEventListener('storage', updateHeader);
</script>

<style>
  .header {
    background-color: #333;
    color: white;
    padding: 1rem;
  }

  .header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .header nav {
    display: flex;
    gap: 1rem;
  }

  .header a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.2s;
  }

  .header a:hover {
    background-color: #555;
    text-decoration: none;
  }

  .user-section {
    display: flex;
    align-items: center;
    gap: 1rem;
  }

  .btn-logout {
    background-color: #dc3545;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
  }

  .btn-logout:hover {
    background-color: #c82333;
  }
</style>

src/components/posthog.astro

---
// PostHog analytics snippet
// Uses is:inline to prevent Astro from processing the script
---
<script is:inline define:vars={{ apiKey: import.meta.env.PUBLIC_POSTHOG_PROJECT_TOKEN, apiHost: import.meta.env.PUBLIC_POSTHOG_HOST }}>
  !function(t,e){var o,n,p,r;e.__SV||(window.posthog=e,e._i=[],e.init=function(i,s,a){function g(t,e){var o=e.split(".");2==o.length&&(t=t[o[0]],e=o[1]),t[e]=function(){t.push([e].concat(Array.prototype.slice.call(arguments,0)))}}(p=t.createElement("script")).type="text/javascript",p.crossOrigin="anonymous",p.async=!0,p.src=s.api_host+"/static/array.js",(r=t.getElementsByTagName("script")[0]).parentNode.insertBefore(p,r);var u=e;for(void 0!==a?u=e[a]=[]:a="posthog",u.people=u.people||[],u.toString=function(t){var e="posthog";return"posthog"!==a&&(e+="."+a),t||(e+=" (stub)"),e},u.people.toString=function(){return u.toString(1)+".people (stub)"},o="capture identify alias people.set people.set_once set_config register register_once unregister opt_out_capturing has_opted_out_capturing opt_in_capturing reset isFeatureEnabled onFeatureFlags getFeatureFlag getFeatureFlagPayload reloadFeatureFlags group updateEarlyAccessFeatureEnrollment getEarlyAccessFeatures getActiveMatchingSurveys getSurveys getNextSurveyStep onSessionId".split(" "),n=0;n<o.length;n++)g(u,o[n]);e._i.push([i,s,a])},e.__SV=1)}(document,window.posthog||[]);
  posthog.init(apiKey || '', {
    api_host: apiHost || 'https://us.i.posthog.com',
    defaults: '2026-01-30'
  })
</script>

src/layouts/PostHogLayout.astro

---
import PostHog from '../components/posthog.astro';
import Header from '../components/Header.astro';
import '../styles/global.css';

interface Props {
  title: string;
}

const { title } = Astro.props;
---
<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Astro PostHog Integration Example" />
    <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
    <title>{title}</title>
    <PostHog />
  </head>
  <body>
    <Header />
    <main>
      <slot />
    </main>
  </body>
</html>

src/lib/auth.ts

// Client-side auth utilities for localStorage-based authentication

export interface User {
  username: string;
  burritoConsiderations: number;
}

export function getCurrentUser(): User | null {
  if (typeof window === "undefined") return null;

  const username = localStorage.getItem("currentUser");
  if (!username) return null;

  const considerations = parseInt(
    localStorage.getItem("burritoConsiderations") || "0",
    10,
  );

  return {
    username,
    burritoConsiderations: considerations,
  };
}

export function login(username: string, password: string): boolean {
  if (!username || !password) return false;

  localStorage.setItem("currentUser", username);
  // Initialize burrito considerations if not set
  if (!localStorage.getItem("burritoConsiderations")) {
    localStorage.setItem("burritoConsiderations", "0");
  }

  return true;
}

export function logout(): void {
  localStorage.removeItem("currentUser");
  localStorage.removeItem("burritoConsiderations");
}

export function incrementBurritoConsiderations(): number {
  const current = parseInt(
    localStorage.getItem("burritoConsiderations") || "0",
    10,
  );
  const newCount = current + 1;
  localStorage.setItem("burritoConsiderations", newCount.toString());
  return newCount;
}

src/pages/burrito.astro

---
import PostHogLayout from '../layouts/PostHogLayout.astro';
---
<PostHogLayout title="Burrito Consideration - Astro PostHog Example">
  <div class="container">
    <h1>Burrito consideration zone</h1>
    <p>Take a moment to truly consider the potential of burritos.</p>

    <div style="text-align: center;">
      <button id="consider-btn" class="btn-burrito">
        I have considered the burrito potential
      </button>

      <p id="success-message" class="success" style="display: none;">
        Thank you for your consideration! Count: <span id="consideration-count"></span>
      </p>
    </div>

    <div class="stats">
      <h3>Consideration stats</h3>
      <p>Total considerations: <span id="total-considerations">0</span></p>
    </div>
  </div>
</PostHogLayout>

<script is:inline>
  function checkAuth() {
    const currentUser = localStorage.getItem('currentUser');
    if (!currentUser) {
      window.location.href = '/';
      return false;
    }
    return true;
  }

  function updateStats() {
    const count = localStorage.getItem('burritoConsiderations') || '0';
    document.getElementById('total-considerations').textContent = count;
  }

  function handleConsideration() {
    const currentUser = localStorage.getItem('currentUser');
    if (!currentUser) return;

    // Increment the count
    const currentCount = parseInt(localStorage.getItem('burritoConsiderations') || '0', 10);
    const newCount = currentCount + 1;
    localStorage.setItem('burritoConsiderations', newCount.toString());

    // Update the UI
    updateStats();

    const successMessage = document.getElementById('success-message');
    const considerationCount = document.getElementById('consideration-count');
    considerationCount.textContent = newCount;
    successMessage.style.display = 'block';

    // Hide success message after 2 seconds
    setTimeout(() => {
      successMessage.style.display = 'none';
    }, 2000);

    // Capture burrito consideration event in PostHog
    window.posthog?.capture('burrito_considered', {
      total_considerations: newCount,
      username: currentUser
    });
  }

  document.addEventListener('DOMContentLoaded', () => {
    if (!checkAuth()) return;

    updateStats();
    document.getElementById('consider-btn')?.addEventListener('click', handleConsideration);
  });
</script>

src/pages/index.astro

---
import PostHogLayout from '../layouts/PostHogLayout.astro';
---
<PostHogLayout title="Home - Astro PostHog Example">
  <div class="container">
    <div id="logged-in-view" style="display: none;">
      <h1>Welcome back, <span id="welcome-username"></span>!</h1>
      <p>You are now logged in. Feel free to explore:</p>
      <ul>
        <li>Consider the potential of burritos</li>
        <li>View your profile and statistics</li>
      </ul>
    </div>

    <div id="logged-out-view">
      <h1>Welcome to Burrito Consideration App</h1>
      <p>Please sign in to begin your burrito journey</p>

      <form id="login-form" class="form">
        <div class="form-group">
          <label for="username">Username:</label>
          <input
            type="text"
            id="username"
            placeholder="Enter any username"
            required
          />
        </div>

        <div class="form-group">
          <label for="password">Password:</label>
          <input
            type="password"
            id="password"
            placeholder="Enter any password"
            required
          />
        </div>

        <p id="error-message" class="error" style="display: none;"></p>

        <button type="submit" class="btn-primary">Sign In</button>
      </form>

      <p class="note">
        Note: This is a demo app. Use any username and password to sign in.
      </p>
    </div>
  </div>
</PostHogLayout>

<script is:inline>
  function updateView() {
    const currentUser = localStorage.getItem('currentUser');
    const loggedInView = document.getElementById('logged-in-view');
    const loggedOutView = document.getElementById('logged-out-view');
    const welcomeUsername = document.getElementById('welcome-username');

    if (currentUser) {
      loggedInView.style.display = 'block';
      loggedOutView.style.display = 'none';
      welcomeUsername.textContent = currentUser;
    } else {
      loggedInView.style.display = 'none';
      loggedOutView.style.display = 'block';
    }
  }

  function handleLogin(event) {
    event.preventDefault();

    const username = document.getElementById('username').value;
    const password = document.getElementById('password').value;
    const errorMessage = document.getElementById('error-message');

    if (!username || !password) {
      errorMessage.textContent = 'Please provide both username and password';
      errorMessage.style.display = 'block';
      return;
    }

    // Client-side only fake auth - store in localStorage
    localStorage.setItem('currentUser', username);
    if (!localStorage.getItem('burritoConsiderations')) {
      localStorage.setItem('burritoConsiderations', '0');
    }

    // Identify the user in PostHog (once on login is enough)
    window.posthog?.identify(username);
    window.posthog?.capture('user_logged_in');

    // Clear form
    document.getElementById('username').value = '';
    document.getElementById('password').value = '';
    errorMessage.style.display = 'none';

    // Update view
    updateView();

    // Trigger header update
    window.dispatchEvent(new Event('storage'));
  }

  document.addEventListener('DOMContentLoaded', () => {
    updateView();
    document.getElementById('login-form')?.addEventListener('submit', handleLogin);
  });

  // Listen for storage changes
  window.addEventListener('storage', updateView);
</script>

src/pages/profile.astro

---
import PostHogLayout from '../layouts/PostHogLayout.astro';
---
<PostHogLayout title="Profile - Astro PostHog Example">
  <div class="container">
    <h1>User Profile</h1>

    <div class="stats">
      <h2>Your Information</h2>
      <p><strong>Username:</strong> <span id="profile-username"></span></p>
      <p><strong>Burrito Considerations:</strong> <span id="profile-considerations">0</span></p>
    </div>

    <div style="margin-top: 2rem;">
      <h3>Your Burrito Journey</h3>
      <p id="journey-message"></p>
    </div>

    <div style="margin-top: 2rem;">
      <h3>Error Tracking Demo</h3>
      <p>Click the button below to trigger a test error and send it to PostHog:</p>
      <button id="error-btn" class="btn-error">
        Trigger Test Error
      </button>
      <p id="error-feedback" class="success" style="display: none;">
        Error captured and sent to PostHog!
      </p>
    </div>
  </div>
</PostHogLayout>

<script is:inline>
  function checkAuth() {
    const currentUser = localStorage.getItem('currentUser');
    if (!currentUser) {
      window.location.href = '/';
      return false;
    }
    return true;
  }

  function updateProfile() {
    const username = localStorage.getItem('currentUser') || '';
    const considerations = parseInt(localStorage.getItem('burritoConsiderations') || '0', 10);

    document.getElementById('profile-username').textContent = username;
    document.getElementById('profile-considerations').textContent = considerations;

    // Update journey message based on consideration count
    const journeyMessage = document.getElementById('journey-message');
    if (considerations === 0) {
      journeyMessage.textContent = "You haven't considered any burritos yet. Visit the Burrito Consideration page to start!";
    } else if (considerations === 1) {
      journeyMessage.textContent = "You've considered the burrito potential once. Keep going!";
    } else if (considerations < 5) {
      journeyMessage.textContent = "You're getting the hang of burrito consideration!";
    } else if (considerations < 10) {
      journeyMessage.textContent = "You're becoming a burrito consideration expert!";
    } else {
      journeyMessage.textContent = "You are a true burrito consideration master!";
    }
  }

  function triggerTestError() {
    try {
      throw new Error('Test error for PostHog error tracking');
    } catch (err) {
      // Capture the error in PostHog
      window.posthog?.captureException(err);
      console.error('Captured error:', err);

      // Show feedback to user
      const feedback = document.getElementById('error-feedback');
      feedback.style.display = 'block';
      setTimeout(() => {
        feedback.style.display = 'none';
      }, 3000);
    }
  }

  document.addEventListener('DOMContentLoaded', () => {
    if (!checkAuth()) return;

    updateProfile();
    document.getElementById('error-btn')?.addEventListener('click', triggerTestError);
  });
</script>

Requirements and compatibility

Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta

“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.

Security

No issues found by our static scan· No issues found

A static scan is not a guarantee. Skills are third-party content: review a skill before you let an agent use it.

Attribution and licence

Created by
PostHog
Publisher
PostHog (Official)
Source
PostHog/skills · skills/posthog/integration/skills/astro-static · commit a5d30e7
Licence
MIT License (redistribution allowed)
  • LICENSE (added by AutoGineer from LICENSE)
  • ATTRIBUTION.md (written by AutoGineer)
Synced
Also distributed in
PostHog/skills

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