Shopify Liquid Skill

Liquid is the template language used by Shopify to load dynamic content on storefronts.

1. Core Syntax

• Output: {{ ... }} - Prints content to the page.
• Tags: {% ... %} - Logic (if, for, assign).
• Filters: {{ value | filter }} - Modifies output.

2. Theme App Extensions (App Blocks)

Modern apps inject code into themes using App Blocks, avoiding direct legacy code edits.

schema Tag

Defines settings available in the Theme Editor.

{% schema %}
{
  "name": "Star Rating",
  "target": "section",
  "settings": [
    {
      "type": "color",
      "id": "star_color",
      "label": "Star Color",
      "default": "#ff0000"
    }
  ]
}
{% endschema %}

Accessing Settings

Use block.settings.id to access values defined in schema.

<div style="color: {{ block.settings.star_color }}">
  ★★★★★
</div>

App Embed Blocks

Scripts that run globally (e.g., analytics, chat bubbles).

{% schema %}
{
  "name": "Chat Bubble",
  "target": "body",
  "javascript": "chat.js",
  "settings": []
}
{% endschema %}

3. Common Objects

• product:
  • {{ product.title }}
  • {{ product.variants.first.id }}
  • {{ product.featured_image | image_url: width: 400 }}
• cart:
  • {{ cart.item_count }}
  • {{ cart.currency.iso_code }}
• customer:
  • {% if customer %} checks if logged in.
• shop:
  • {{ shop.name }}
  • {{ shop.permanent_domain }}

4. Useful Filters

• Money: {{ product.price | money }} -> $10.00
• Asset URL: {{ 'style.css' | asset_url }} (Reference assets in assets/ folder)
• JSON: {{ product | json }} (Useful for passing data to JS)

5. Using with JavaScript

Pass Liquid data to JavaScript using data attributes or global variables.

Pattern: Data Attributes (Preferred)

<div id="my-app" data-product-id="{{ product.id }}" data-shop="{{ shop.permanent_domain }}"></div>

<script>
  const app = document.getElementById('my-app');
  const productId = app.dataset.productId;
</script>

Pattern: Global Object (Legacy)

<script>
  window.ShopifyData = {
    product: {{ product | json }},
    cart: {{ cart | json }}
  };
</script>

6. App Proxies

When the request comes from an App Proxy, liquid renders the response before sending it to the layout.

• If you return Content-Type: application/liquid, Shopify will parse the Liquid in your response.