Alpine.js Online Editor - Lightweight Reactivity Right in Your Browser

Alpine.js is what you reach for when React is too much and vanilla JS is too tedious. It gives you reactivity, event handling, and DOM manipulation through inline directives -- right in your HTML. Think of it as the modern replacement for jQuery, minus the baggage.

Since Alpine lives entirely in your markup, an online editor is a natural fit for trying things out.

What Alpine.js does well

Alpine gives you three core primitives: x-data for state, x-bind/x-on for bindings and events, and x-show/x-if for toggling visibility. That's enough to build dropdown menus, modals, tabs, accordions, and most interactive UI patterns that don't need a full SPA framework.

The whole library is around 15KB. You include a script tag. That's the setup.

Example: a toggle component

Here's a classic Alpine.js pattern -- a collapsible section controlled by x-data. Paste it into the Alpine.js editor on OneCompiler:

<script defer src="https://cdn.jsdelivr.net/npm/[email protected]/dist/cdn.min.js"></script>

<style>
  body { font-family: system-ui, sans-serif; max-width: 480px; margin: 2rem auto; }
  .card { border: 1px solid #e2e8f0; border-radius: 8px; overflow: hidden; }
  .card-header { padding: 1rem; background: #f8fafc; cursor: pointer;
                 display: flex; justify-content: space-between; align-items: center; }
  .card-body { padding: 1rem; border-top: 1px solid #e2e8f0; }
  .arrow { transition: transform 0.2s; }
</style>

<div x-data="{ open: false }" class="card">
  <div class="card-header" @click="open = !open">
    <strong>What is Alpine.js?</strong>
    <span class="arrow" :style="open ? 'transform: rotate(90deg)' : ''">&#9654;</span>
  </div>
  <div x-show="open" x-transition class="card-body">
    <p>Alpine.js is a minimal framework for adding interactive behavior to your HTML.
       It weighs about 15KB and requires zero build tooling.</p>
    <p style="margin-top: 0.5rem; color: #64748b;">
      You define state with <code>x-data</code>, react to events with <code>@click</code>,
      and toggle visibility with <code>x-show</code>. That's most of it.
    </p>
  </div>
</div>

Click the header. The body slides open with a CSS transition managed by x-transition. Click again, it collapses. All the logic is right there in the HTML -- no separate JS file, no component registration.

Why use an online Alpine.js editor?

Alpine is already zero-build. But there are still good reasons to use a playground:

• Isolation. Testing a new x-data pattern in your existing app means finding the right file, adding markup, checking it didn't break something else. A playground lets you test in a clean environment.
• Sharing patterns. "How would you build a dropdown with Alpine?" becomes a link instead of a paragraph of explanation.
• Learning the directives. When you're figuring out the difference between x-show and x-if, or how x-effect works, fast iteration matters. Type, run, see. Repeat.
• No local files to clean up. Quick experiments don't leave throwaway HTML files scattered across your machine.

Try it on OneCompiler

OneCompiler's Alpine.js playground gives you an editor and live preview. Paste in your markup, see Alpine's reactivity in action, share your code via URL.

It's the fastest way to go from "I wonder if this works" to "here, look at this" with Alpine.js.

Start here: onecompiler.com/alpinejs