0.0.4 • Public • Published

JS Tool for Tailwind CSS

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jstool-for-tailwindcss is a plugin for Tailwind CSS that introduces the js directive, a utility that allows you to evaluate JavaScript expressions within your utility classes. This provides a flexible, dynamic approach to defining your styles.


You can install the plugin via npm:

npm install jstool-for-tailwindcss

Then, include it in your tailwind.config.js:

module.exports = {
  plugins: [

or if using a custom context object:

module.exports = {
  plugins: [
      appName: 'My app',
      // ...other values


The plugin provides a js directive, allowing you to use JavaScript expressions within your utility classes:

Basic Usage

For a simple use case, you can use JavaScript expressions directly in your utility classes with the js directive:

<div class="js-[content-['1_+_1_=_#{1+1}']]"></div>

This will output the following content: 1 + 1 = 2

Using Context Values

You can also use values from your context object within your utility classes:

<div class="js-[content-['The_app_name_is_#{appName}']]"></div>

This will output the following content: The app name is My app

Built-In Context Values

In addition to any custom values you pass in, the plugin also provides easy access to both the theme and config functions:

<div class="before:js-[content-['fontSize.2xl_===_#{theme('fontSize.2xl')}']]"></div>

This will output the following content: fontSize.2xl === 1.5rem

Please note that all utilities are built at runtime, so in order for a one-off utility to be random or unique, the utility will need to be unique as well. One way to ensure this is the case—when needed—is to pass some sort of custom identifier to properly seed the utility.

Other (mostly random & unrealistic) examples

<!-- Displaying all registered config keys -->
<div class="before:js-[content-['the_registered_config_keys_are_#{Object.keys(config()).join(',_')}']]"></div>

<!-- Displaying a random digit using a function from the context object -->
<div class="before:js-[content-['A_random_digit_is_#{randomDigit()}']]"></div>

<!-- Using random colors for text and text shadow, once again using a custom function from the context object -->
<div class="js-[[--random-color:#{randomColor()}]] js-[[--random-color-2:#{randomColor()}]] text-[--random-color] font-semibold [text-shadow:1px_2px_0_var(--random-color-2)]">Random_colors_ftw!</div>

<!-- Using random length for text size -->
<div class="js-[[--random-length:#{randomRange(16,22)}px]] text-[length:--random-length]">Random sizes too 🤯</div>

All of these examples can also be seen and tested here on Tailwind Play: https://play.tailwindcss.com/ZID1xrVAra

Why use jstool-for-tailwindcss

jstool-for-tailwindcss allows you to bring the power of JavaScript directly into your utility classes, enabling dynamic styles based on logic and state. This opens up endless possibilities for reactive design patterns.

This plugin is…

GREAT for providing dynamic styles based on application state or logic 👏🏼

😬 NOT recommended for complex JavaScript expressions or application logic due to performance concerns 👀

I hope you find jstool-for-tailwindcss a valuable addition to your projects. If you have any issues or suggestions, don't hesitate to open an issue or pull request.

If you liked this, you might also like my other Tailwind CSS plugins:

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  • brandonmcconnell