log

Outputs a message to the Logs section of the Developer Console. Useful for debugging, tracking script execution, and monitoring variable values.

{% log "Hello world!" %}
{% log order.name %}
{% log "Order total: " | append: order.total_price %}

Syntax

{% log value %}
{% log value | filter %}
{% log "string" | append: variable %}

Parameters

Parameter	Required	Description
value	Yes	Any value to log - string, number, object, array, or variable

Output Formatting

The log tag automatically formats output based on the value type:

Value Type	Output
String	Displayed as-is
Number	Displayed as-is
Object	JSON-formatted with indentation
Array	JSON-formatted with indentation
null	Displayed as "null"
undefined	Displayed as "undefined"

Examples

Log a simple message:

{% log "Script started" %}

Log a variable:

{% log order %}
{% log customer.email %}
{% log line_items %}

Log with appended values:

{% log "Processing order: " | append: order.name %}
{% log "Customer email: " | append: customer.email %}
{% log "Total items: " | append: order.line_items.size %}

Log calculation results:

{% assign discount = order.total_price | times: 0.1 %}
{% log "Discount amount: " | append: discount %}

Debug conditional logic:

{% if customer.orders_count > 10 %}
  {% log "VIP customer detected" %}
  {% assign is_vip = true %}
{% else %}
  {% log "Regular customer" %}
  {% assign is_vip = false %}
{% endif %}

Log loop progress:

{% for item in order.line_items %}
  {% log "Processing item: " | append: item.title %}

  {% comment %} Process item... {% endcomment %}

  {% log "Item " | append: forloop.index | append: " of " | append: forloop.length | append: " complete" %}
{% endfor %}

Log object properties:

{% log "Order ID: " | append: order.id %}
{% log "Order name: " | append: order.name %}
{% log "Created at: " | append: order.created_at %}
{% log "Financial status: " | append: order.financial_status %}

Log entire objects for debugging:

{% comment %} Log full order object {% endcomment %}
{% log order %}

{% comment %} Log API response {% endcomment %}
{% http url: api_endpoint, method: "GET" as response %}
{% log response %}

{% comment %} Log GraphQL result {% endcomment %}
{% graphql query: my_query, variables: vars as result %}
{% log result %}

Log array contents:

{% assign tags = product.tags | split: ", " %}
{% log "Product tags:" %}
{% log tags %}

Track script execution flow:

{% log "=== Starting inventory sync ===" %}

{% log "Step 1: Fetching products..." %}
{% comment %} ... fetch logic ... {% endcomment %}

{% log "Step 2: Processing updates..." %}
{% comment %} ... update logic ... {% endcomment %}

{% log "Step 3: Sending notifications..." %}
{% comment %} ... notification logic ... {% endcomment %}

{% log "=== Inventory sync complete ===" %}

Log with JSON filter for complex objects:

{% json payload %}
  {
    "order_id": {{ order.id }},
    "items": {{ order.line_items | map: "sku" | json }}
  }
{% endjson %}

{% log "Payload created:" %}
{% log payload %}

Conditional logging:

{% if response.status != 200 %}
  {% log "API Error - Status: " | append: response.status %}
  {% log "Error body:" %}
  {% log response.body %}
{% endif %}

Notes

• Logs appear in the Logs section of the Developer Console

• Objects and arrays are automatically JSON-formatted with 2-space indentation

• Maximum log length is 20,000 characters - longer logs are truncated

• Supports Liquid filters for formatting (e.g., | append:, | upcase, | date:)

• No credit cost for logging

• Use logs liberally during development, consider reducing in production for cleaner output