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Code

Pug allows you to write inline JavaScript code in your templates. There are three types of code: Unbuffered, Buffered, and Unescaped Buffered.

Unbuffered Code

Unbuffered code starts with -. It does not directly add anything to the output.

- for (var x = 0; x < 3; x++)
  li item
<li>item</li>
<li>item</li>
<li>item</li>

Pug also supports block unbuffered code:

-
  var list = ["Uno", "Dos", "Tres",
          "Cuatro", "Cinco", "Seis"]
each item in list
  li= item
<li>Uno</li>
<li>Dos</li>
<li>Tres</li>
<li>Cuatro</li>
<li>Cinco</li>
<li>Seis</li>

Buffered Code

Buffered code starts with =. It evaluates the JavaScript expression and outputs the result. For security, buffered code is first HTML escaped.

p
  = 'This code is <escaped>!'
<p>This code is &lt;escaped&gt;!</p>

It can also be written inline with attributes, and supports the full range of JavaScript expressions:

p= 'This code is' + ' <escaped>!'
<p>This code is &lt;escaped&gt;!</p>

Unescaped Buffered Code

Unescaped buffered code starts with !=. It evaluates the JavaScript expression and outputs the result. Unescaped buffered code does not perform any escaping, so is unsafe for user input:

p
  != 'This code is <strong>not</strong> escaped!'
<p>This code is <strong>not</strong> escaped!</p>

Unescaped buffered code can also be written inline with attributes, and supports the full range of JavaScript expressions:

p!= 'This code is' + ' <strong>not</strong> escaped!'
<p>This code is <strong>not</strong> escaped!</p>
Caution

Unescaped buffered code can be dangerous. You must be sure to sanitize any user inputs to avoid cross-site scripting (XSS).

© Pug authors
Licensed under the MIT license.
https://pugjs.org/language/code.html