---
title: "Online Store 2.0: Detect theme errors with Theme Check - Shopify developer changelog"
description: Shopify’s developer changelog documents all changes to Shopify’s platform. Find the latest news and learn about new platform opportunities.
source_url:
  html: https://shopify.dev/changelog/online-store-2-0-detect-theme-errors-with-theme-check
  md: https://shopify.dev/changelog/online-store-2-0-detect-theme-errors-with-theme-check.md
---

[Back to Developer changelog](https://shopify.dev/changelog)

June 29, 2021

Tags:

* Tools

# Online Store 2.0: Detect theme errors with Theme Check

Theme Check scans themes for errors and highlights Shopify theme and Liquid best practices. You can run these checks as a part of the Shopify Liquid Visual Studio Code extension. Theme Check identifies several types of issues within your theme code, including:

* Liquid syntax errors
* Missing templates
* Unused variables and snippets
* Unknown and deprecated tags
* Excessive snippet nesting
* Performance issues

[Learn more about Theme Check](https://shopify.dev/themes/tools/theme-check).