Nano templating engine for Javascript strings and DOM Elements
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Nano Template JS

This tiny Javascript library provides a small addition to the string and DOM Element objects that allows for simple templating features.


This library provides a single function, t (and an alias named template) that can be executed on Javascript strings. Templates are identified by the $ marker, followed either by a number starting from 0 (e.g., $2) or a word (e.g., $foo).

Positional parameters

The easiest way to use this library is passing the values to be replaced directly as function arguments:

string.t(value1, value2, value3, ...)


"test $0 $1".t("one", "two") returns "test one two"

Named parameters

Since arguments have implicit assignment to their position, this library provides word-based templates, which should be passed as simple Javascript objects:



"<a href='$url'>$text</a>".t({url:"", text: "foo"}) returns "<a href=''>foo</a>"


This library also provides looping capabilities, which can be useful for applying a single template to a set of values. This is achieved by passing a Javascript array as a single parameter:



"test $0 ".t(["one", "two"]) returns "test one test two "

DOM templates

Apart from extending string objects, this library allows for direct manipulation of DOM elements, following the same usage pattern:



Assuming the following excerpt of an HTML document:

<p id='my-element'>$text</p>

The execution of the following Javascript snippet

document.getElementById('my-element').t({text: "lorem ipsum ..."})

will transform the respective DOM element into:

<p id='my-element'>lorem ipsum ...</p>

Note: this function can be applied several times to a DOM Element, since DOM Element templates are cached.

Additional examples

More example usage can be found in the test directory of this project:

  • assertions.js provides insights on the usage of this library, especially in the context of server-side Javascript;
  • assertions.html provides some usage scenarios to apply this library directly within HTML documents.


This library extends the functionalities provided by the String and DOM Element objects. Use with caution, since it might break some libraries/scripts.