Theme Check

Theme Check is a linter for the Liquid and JSON inside your theme and theme app extensions. It detects errors and enforces Liquid best practices.

Theme Check can identify several issues in your theme code. For example, it can identify the following:

Syntax errors
Missing templates
Unused variables and snippets
Unknown and deprecated tags
Performance issues

Programming and style errors display directly in your console or code editor. Each error includes a link to the failed check's documentation, allowing you to debug issues quickly.

You can use Theme Check in the following ways:

Through Shopify CLI - Run checks against your theme on demand, in CI or with our Language Server.
Via the Shopify Liquid Visual Studio Code extension - Theme Check is included in the extension.

Installation

Anchor link to section titled "Installation"

Configuration

Anchor link to section titled "Configuration"

You can configure check options to override defaults, or enable or disable specific checks, or point to your own custom checks. To learn more, refer to Theme Check configuration.

Creating your own checks

Anchor link to section titled "Creating your own checks"

You can write your own checks in TypeScript and then reference them in your configuration. To learn about how the existing checks are written, explore the theme-tools repo.