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Nunjucks review

Free#17 of 65 in Template Engine Software

An open-source JavaScript engine with inheritance, escaping, and sync or async rendering.

7.9/10Editor score
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Nunjucks is an open-source templating engine for JavaScript applications, inspired by Jinja2. It renders templates in Node.js and modern browsers, so it can suit teams that want a Jinja-like syntax across server and browser contexts. Its feature set includes inheritance, blocks, filters, macros, and extensions, with configurable template loaders for filesystem and web sources. The published positioning is a fit for JavaScript teams seeking logic-based templates rather than a narrowly focused string-substitution tool.

Template composition and rendering flexibility are central strengths. Base templates and blocks support inheritance, while custom filters, tags, and extensions let developers shape template behavior. Rendering is synchronous by default; asynchronous rendering is also supported through callbacks, async filters, extensions, and loaders. Browser precompilation is available for browser use. Automatic output escaping is enabled by default, an important default for rendered output, though Nunjucks does not sandbox user-defined templates. Teams that need a sandbox for untrusted templates should choose an alternative designed to provide one.

Nunjucks is distributed as an open-source JavaScript package, with documentation and community support channels. Express support is documented as an integration option. Those characteristics make it relevant to solo developers through enterprise teams that can work with an open-source engine and its documented integration path. It is less suitable for buyers looking for commercial plans, a managed support offering, or sandboxing of user-defined templates. Choose Nunjucks when inheritance, browser precompilation, and both synchronous and asynchronous rendering matter; look elsewhere if template isolation is a requirement.

Nunjucks pros and cons

  • Where it wins
    • Renders in Node.js and modern browsers, with browser precompilation
    • Includes template inheritance, blocks, filters, macros, and extensions
    • Automatic output escaping is enabled by default
  • Where it doesn't
    • Does not sandbox user-defined templates
    • Asynchronous rendering uses callbacks, async filters, extensions, or loaders
    • Express is the listed integration

Nunjucks fact sheet, pricing and score →

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