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Template renderer

Put JSON data on top, a template below, and watch the rendered result update live — pick Nunjucks or Handlebars (both bundled, versions in the ledger). Rendering runs isolated in a worker, and the result is always plain text, never injected as live HTML: that is the safety boundary.

Privacy ledger

Data acquired	None.
Libraries used	Lit 3, Nunjucks 3.2.4 (BSD-2-Clause) and Handlebars 4.7.8 (MIT) — all bundled into the tool file itself.
Data stored	None.
Data transmitted	None.

Use it on your own page

Download the tool as a single self-contained HTML file: readable source with the Lit library included, zero network requests — it works opened straight from your disk, and you can customize everything.

Download as HTML file

Prefer the hosted widget? One script tag embeds it and stays up to date:

<script type="module" src="https://uuutil.com/tools/template-renderer.js"></script>
<uu-template-renderer lang="en"></uu-template-renderer>

Source license: MIT — free to use, modify and redistribute; keep the license notice in copies.