Top 5 Liquid Syntax Mistakes That Break Your Shopify Store (And How to Fix Them)
After analyzing thousands of broken Shopify themes, we've identified the most common Liquid syntax errors that cause stores to crash. Here's how to avoid them and save hours of debugging.
TL;DR
- • Missing
endifandendfortags cause 40% of Liquid errors - • Incorrect filter syntax breaks product prices and images
- • Undefined variables create blank sections
- • Wrong operator usage in conditionals fails silently
- • Missing
| escapecreates XSS vulnerabilities
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1. The Missing End Tag Nightmare
This is by far the most common mistake that breaks Shopify stores. Every {% if %}, {% for %}, and {% case %} needs its corresponding end tag.
{% if product.available %}
<button>Add to Cart</button>
<!-- Missing endif! -->{% if product.available %}
<button>Add to Cart</button>
{% endif %}2. Filter Syntax Chaos
Liquid filters use the pipe | character, not dots or parentheses. Getting this wrong breaks product displays instantly.
{{ product.price.money() }}
{{ product.title.upcase }}{{ product.price | money }}
{{ product.title | upcase }}3. The Undefined Variable Trap
Accessing undefined variables doesn't throw errors in Liquid - it just returns nothing. This creates mysterious blank sections that are hard to debug.
{% if collection %}
<h2>{{ collection.title }}</h2>
{% else %}
<h2>All Products</h2>
{% endif %}4. Comparison Operator Confusion
Liquid uses different operators than most programming languages. Using === or && will fail silently.
{% if product.type === "Shirt" && product.available === true %}{% if product.type == "Shirt" and product.available == true %}5. Security Vulnerability: Missing Escape Filter
Never output user-generated content without the escape filter. This prevents XSS attacks on your store.
{{ customer.note }}{{ customer.note | escape }}Stop Debugging Liquid Errors Forever
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