> ## Documentation Index > Fetch the complete documentation index at: https://docs.joinmarkt.com/llms.txt > Use this file to discover all available pages before exploring further. # Nunjucks Theme Pitfalls > Hard rules from shipping live Nunjucks themes — autoescape, Alpine x-data, cartPage, lean cart API, visibility. # Nunjucks Theme Pitfalls Shipping checklist for Nunjucks theme authors. These caused real production bugs. Also see [Nunjucks Theme API](/storefront/nunjucks), [Products & Catalog](/storefront/products), [Shortcodes & Tags](/storefront/shortcodes), [Policy & Legal Pages](/storefront/policy-pages). *** ## 1. `autoescape` is `false` Join Markt runs Nunjucks with **`autoescape: false`**. Do **not** put HTML fields (`product.description`, `seo_description`) into attributes: ```njk theme={null} {# BAD — quotes/HTML break the tag; text leaks above the navbar #} ``` Do instead — strip HTML for meta, or encode with `json`: ```njk theme={null} ``` *** ## 2. Never put `| json` inside `x-data="..."` ```njk theme={null} {# BAD — quotes break the attribute and dump JSON on the page #}

``` Put boot data in a JSON script; read it in JS / `x-init`. Prefer **lean** fields (no description HTML): ```njk theme={null}

``` *** ## 3. Never dump full `products` into `` scripts Full catalog JSON (with HTML descriptions) in `` can break out of `