prettier-plugin-bootstrap

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A Prettier plugin that automatically sorts Bootstrap CSS classes following the framework's recommended order.

Works with HTML, JSX/TSX, Vue, Angular, Svelte, and Astro templates.

Why?

• Consistency — Every file in your project uses the same class order, regardless of who wrote it.
• Smaller diffs — Sorted classes eliminate noisy reordering in pull requests.
• Readability — Classes follow Bootstrap's architecture (layout → components → utilities), making it easier to scan what an element does.
• Zero config — Just add the plugin and format. No ESLint rules to configure, no manual sorting.

Installation

npm install -D prettier-plugin-bootstrap
# or
pnpm add -D prettier-plugin-bootstrap
# or
yarn add -D prettier-plugin-bootstrap

Usage

Add the plugin to your Prettier configuration:

{
  "plugins": ["prettier-plugin-bootstrap"]
}

That's it! Your Bootstrap classes will now be automatically sorted on format.

HTML

<!-- Before -->
<div class="text-center p-3 container bg-primary text-white mb-4 rounded"></div>

<!-- After -->
<div class="container mb-4 p-3 text-center text-white bg-primary rounded"></div>

JSX / TSX

// Before
<button className="btn-lg mt-2 btn btn-primary d-flex align-items-center">Click</button>

// After
<button className="d-flex align-items-center mt-2 btn btn-primary btn-lg">Click</button>

Vue

<!-- Before -->
<div :class="['text-center', 'container', 'p-3']"></div>

<!-- After -->
<div :class="['container', 'p-3', 'text-center']"></div>

Svelte

<!-- Before -->
<div class="text-white p-2 bg-dark d-flex"></div>

<!-- After -->
<div class="d-flex p-2 text-white bg-dark"></div>

Astro

<!-- Before -->
<div class="rounded text-sm p-4 card shadow"></div>

<!-- After -->
<div class="card p-4 rounded shadow text-sm"></div>

Sorting Order

Classes are sorted following Bootstrap's architecture:

1. Layout — containers, grid, columns
2. Reboot / Typography — headings, lead, display
3. Images — img-fluid, figures
4. Tables — table variants
5. Forms — form controls, selects, checks
6. Buttons — btn variants
7. Components — dropdowns, navs, cards, modals, etc. (alphabetical)
8. Helpers — clearfix, stacks, visually-hidden
9. Utilities — following the order in scss/_utilities.scss

Within each group, responsive variants (sm, md, lg, xl, xxl) sort after the base class.

Unknown classes are preserved in their original relative order and placed after all known Bootstrap classes.

Options

Option	Type	Default	Description
bootstrapAttributes	string[]	[]	Additional HTML attributes to sort (beyond class and className). Supports regex patterns (e.g. /^data-class/).
bootstrapFunctions	string[]	[]	Function names whose arguments are class lists (e.g. clsx, classNames)
bootstrapPreserveWhitespace	boolean	false	Preserve original whitespace between classes instead of normalizing to single spaces
bootstrapPreserveDuplicates	boolean	true	Keep duplicate class names. Set to false to remove duplicates
bootstrapVersion	int	5	Bootstrap version (4 or 5). Any other value falls back to Bootstrap 5 sorting.
bootstrapSortTemplateLiterals	boolean	true	Sort static class segments inside JSX template literals that contain expressions. Set to false to skip them

bootstrapAttributes

Sort classes in custom attributes beyond class / className:

<!-- .prettierrc: { "bootstrapAttributes": ["ngClass"] } -->

<!-- Before -->
<div [ngClass]="'text-center p-3 container'"></div>

<!-- After -->
<div [ngClass]="'container p-3 text-center'"></div>

bootstrapFunctions

Sort class strings passed to utility functions like clsx:

// .prettierrc: { "bootstrapFunctions": ["clsx"] }

// Before
clsx('btn-lg', 'mt-2', 'btn', 'btn-primary')

// After
clsx('mt-2', 'btn', 'btn-primary', 'btn-lg')

bootstrapPreserveWhitespace

Keep original whitespace between classes (default: normalise to single spaces):

<!-- .prettierrc: { "bootstrapPreserveWhitespace": true } -->

<!-- Before -->
<div class="p-3   container  mt-2"></div>

<!-- After (whitespace preserved) -->
<div class="container  mt-2   p-3"></div>

bootstrapPreserveDuplicates

Remove duplicate class names by setting to false (default: true, keep duplicates):

<!-- .prettierrc: { "bootstrapPreserveDuplicates": false } -->

<!-- Before -->
<div class="p-3 container p-3 mt-2"></div>

<!-- After (duplicate p-3 removed) -->
<div class="container mt-2 p-3"></div>

bootstrapSortTemplateLiterals

By default, static class segments inside JSX template literals with expressions are sorted independently:

// Before
<div className={`text-white container ${condition} mt-3 p-2`} />

// After (each static segment sorted independently)
<div className={`container text-white ${condition} mt-3 p-2`} />

Set to false to restore the pre-v0.4.0 behaviour and skip template literals with expressions entirely:

{ "bootstrapSortTemplateLiterals": false }

Full example

{
  "plugins": ["prettier-plugin-bootstrap"],
  "bootstrapAttributes": ["ngClass", "v-bind:class", "/^data-class/"],
  "bootstrapFunctions": ["clsx", "cn", "classNames"]
}

TypeScript Configuration

For type-safe configuration, use JSDoc annotations:

/** @type {import('prettier-plugin-bootstrap').BootstrapPluginOptions} */
const config = {
  plugins: ['prettier-plugin-bootstrap'],
  bootstrapAttributes: ['ngClass'],
  bootstrapFunctions: ['clsx', 'cn'],
  bootstrapPreserveDuplicates: false,
}

export default config

Regex Attributes

You can use regex patterns in bootstrapAttributes to match dynamic attribute names:

{
  "bootstrapAttributes": ["/^data-class/", "/Class$/"]
}

Patterns must be wrapped in forward slashes. Optional flags (i, g, etc.) are supported: /^data-class/i.

File-Level Ignore

Add a comment at the top of a file to skip Bootstrap class sorting for the entire file:

<!-- prettier-bootstrap-ignore -->
<div class="mt-3 container">Will not be sorted</div>

For JS/TS files:

// prettier-bootstrap-ignore
export default () => <div className="mt-3 container">Not sorted</div>

Or block comment style:

/* prettier-bootstrap-ignore */

Inline Ignore (single element)

To skip sorting for a single element while keeping sorting active for the rest of the file, add an ignore comment on the line before the element:

<!-- prettier-bootstrap-ignore-next -->
<div class="mt-3 container">This element will NOT be sorted</div>

<div class="mt-3 container">This one WILL be sorted → container mt-3</div>

For JS/TS files:

// prettier-bootstrap-ignore-next
<div className="mt-3 container">Not sorted</div>

<div className="mt-3 container">Sorted → container mt-3</div>

Public Sorting API

For programmatic use (linters, codemods, build tools), import the sorter directly:

import { createSorter } from 'prettier-plugin-bootstrap/sorter'

const sorter = createSorter({ preserveDuplicates: false })

sorter.sort('mt-3 container p-2') // "container mt-3 p-2"
sorter.sortClasses(['mt-3', 'container']) // ["container", "mt-3"]

Editor Integration

No editor-specific configuration is needed — the plugin works through Prettier. Enable "Format on Save" in your editor and Prettier will sort classes automatically.

VS Code

1. Install the Prettier - Code formatter extension.
2. Add to .vscode/settings.json:

{
  "editor.formatOnSave": true,
  "editor.defaultFormatter": "esbenp.prettier-vscode"
}

WebStorm / IntelliJ

Go to Settings → Languages & Frameworks → Prettier and enable Run on save.

Neovim

Use conform.nvim or null-ls with Prettier as the formatter, then enable format-on-save in your config.

Supported Parsers

• html — HTML files
• vue — Vue single-file components
• angular — Angular templates
• babel / babel-ts / typescript — JSX/TSX files
• acorn / meriyah — Alternative JS parsers
• svelte — Svelte components (requires prettier-plugin-svelte)
• astro — Astro components (requires prettier-plugin-astro)

Svelte

When using with prettier-plugin-svelte, list prettier-plugin-bootstrap after prettier-plugin-svelte in your config:

{
  "plugins": ["prettier-plugin-svelte", "prettier-plugin-bootstrap"]
}

Astro

When using with prettier-plugin-astro, list prettier-plugin-bootstrap after prettier-plugin-astro in your config so it can wrap the Astro parser:

{
  "plugins": ["prettier-plugin-astro", "prettier-plugin-bootstrap"]
}

Plugin Compatibility

This plugin works alongside other Prettier plugins. Load order matters — prettier-plugin-bootstrap should come last so it can wrap the parsers registered by other plugins.

Plugin	Compatible	Load Order
prettier-plugin-svelte	Yes	svelte first
prettier-plugin-astro	Yes	astro first
prettier-plugin-tailwindcss	N/A	Use one or the other (both sort classes)
prettier-plugin-organize-imports	Yes	Any order
@trivago/prettier-plugin-sort-imports	Yes	Any order

FAQ

Does class sorting affect line wrapping?

Yes. Reordering classes changes the string length, which may cause Prettier to wrap lines differently based on your printWidth setting. This is expected — the formatting is still deterministic and consistent.

Can I use this with Tailwind CSS?

This plugin is designed specifically for Bootstrap's class system. If you use Tailwind CSS, use prettier-plugin-tailwindcss instead. They should not be used together as they have conflicting sort orders.

Development

pnpm install
pnpm run build
pnpm run test
pnpm run typecheck

Compatibility

• Prettier >= 3.0.0
• Node.js >= 20.19
• Bootstrap 5 (default, bootstrapVersion: 5)
• Bootstrap 4 (bootstrapVersion: 4)

ESLint companion

An ESLint plugin is available under packages/eslint-plugin for enforcing sorted Bootstrap class order as a lint rule (useful in pre-commit hooks or CI without running Prettier).

npm install -D eslint-plugin-bootstrap-order

License

MIT