Pages Plugins — Hono, Svelte, Vue, Astro

In this tutorial, you'll learn about Pages Plugins. We cover key concepts, practical examples, and best practices to help you understand and apply this topic effectively.

This tutorial explains how to use Cloudflare Pages Plugins to add framework support for Hono, Svelte, Vue, and Astro without writing boilerplate configuration code. Plugins wrap common Serverless patterns into reusable packages that you drop into your project. The DodaTech API dashboard uses the Hono plugin for HTTP routing and the Svelte plugin for its reactive frontend components.

What Are Pages Plugins

Pages Plugins are npm packages that provide pre-built functionality for your Pages Functions. Each plugin encapsulates route handlers, middleware, and configuration into a single import. You compose plugins together like building blocks to create full-stack applications.

flowchart LR
  A[Pages Project] --> B[Hono Plugin]
  A --> C[Svelte Plugin]
  A --> D[Vue Plugin]
  A --> E[Astro Plugin]
  B --> F[REST API routes]
  C --> G[Reactive UI]
  D --> H[Component framework]
  E --> I[Static + SSR]
  style B fill:#f90,color:#fff
  style C fill:#f90,color:#fff
  style D fill:#f90,color:#fff
  style E fill:#f90,color:#fff

Hono Plugin

Hono is a lightweight HTTP framework for edge runtimes. The plugin provides routing with parameter validation and middleware support.

// functions/api/[[path]].js
import { Hono } from 'hono';
import { handle } from 'hono/cloudflare-pages';

const app = new Hono();

app.get('/api/users', function(c) {
  return c.json([{ id: 1, name: 'Alice' }, { id: 2, name: 'Bob' }]);
});

app.get('/api/users/:id', function(c) {
  const id = c.req.param('id');
  return c.json({ id: parseInt(id), name: 'User ' + id });
});

export const onRequest = handle(app);
// Visiting /api/users returns [{"id":1,"name":"Alice"},{"id":2,"name":"Bob"}]

Svelte Plugin

The Svelte plugin enables server-side rendering for SvelteKit projects deployed to Pages.

// functions/ssr/index.js
import { createPagesHandler } from '@sveltejs/kit/hooks';
import { sequence } from '@sveltejs/kit/hooks';

async function authMiddleware(event) {
  const session = event.cookies.get('session');
  event.locals.user = session ? { id: 1, name: 'Alice' } : null;
  return event;
}

export const handle = sequence(authMiddleware, createPagesHandler());
// Requests with session cookie populate event.locals.user

Vue Plugin

The Vue plugin brings the Vue component model to Pages Functions with server-side rendering support.

// functions/render.js
import { renderToString } from 'vue/server-renderer';
import { createSSRApp } from 'vue';

export async function onRequest(context) {
  const app = createSSRApp({
    template: '<div>{{ message }}</div>',
    data: function() {
      return { message: 'Hello from Vue SSR' };
    }
  });

  const html = await renderToString(app);
  return new Response(html, {
    headers: { 'Content-Type': 'text/html' }
  });
}
// Expected output: <div>Hello from Vue SSR</div>

Astro Plugin

Astro generates static HTML with optional server-side rendering. The plugin integrates with Pages Functions for dynamic routes.

// functions/astro.js
import { experimental_AstroPages } from '@astrojs/cloudflare';

export async function onRequest(context) {
  const astro = new experimental_AstroPages({
    root: process.cwd() + '/dist'
  });

  const response = await astro.render(context.request);
  return response;
}
// Returns compiled Astro pages rendered at the edge

FAQ

Practice Questions

1. Which HTTP framework plugin provides lightweight routing for edge functions?
2. What function from Vue is used to render a component to an HTML string?
3. How do you compose multiple middleware functions in SvelteKit?

Summary

Cloudflare Pages Plugins extend your Functions with framework-specific functionality. Hono provides lightweight routing, Svelte adds SSR with middleware, Vue enables component rendering, and Astro supports static and dynamic pages. Plugins reduce boilerplate and speed up development for full-stack Pages projects.

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