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Bootlint

What's Bootlint?

Bootlint is a tool that checks for several common HTML mistakes in webpages that are using Bootstrap in a fairly "vanilla" way. Vanilla Bootstrap's components/widgets require their parts of the DOM to conform to certain structures. Bootlint checks that instances of Bootstrap components have correctly-structured HTML. Optimal usage of Bootstrap also requires that your pages include certain <meta> tags, an HTML5 doctype declaration, etc.; Bootlint checks that these are present.

Caveats

Bootlint assumes that your webpage is already valid HTML5. If you need to check HTML5 validity, we recommend tools like vnu.jar or grunt-html.

Bootlint assumes that you are using Bootstrap's default class names in your webpage, as opposed to taking advantage of the "mixins" functionality of Less or Sass to map them to custom class names. If you are using mixins, Bootlint may report some false-positive warnings. However, there are some Bootlint checks that are applicable even if you are using mixins pervasively.

Getting Started

Via Grunt

To use Bootlint with Grunt, use the official Grunt plugin: grunt-bootlint.

Via Gulp

If you want to use Bootlint with Gulp, there is an unofficial Gulp plugin: gulp-bootlint

On the command line

Install the module with: npm install -g bootlint

Run it on some HTML files:

bootlint /path/to/some/webpage.html another_webpage.html [...]

This will output the lint warnings applicable to each file.

The CLI also accepts a --disable (or -d) option to disable certain lint checks. --disable takes a comma-separated list of lint problem IDs. Here's an example:

bootlint -d W002,E020 /path/to/some/webpage.html another_webpage.html [...]

The CLI will also process stdin input which means that you can pipe into Bootlint:

cat mypage.html | bootlint

Or you could use a heredoc (mostly useful for quick testing):

bootlint << EOF
<button class="btn btn-default">Is this correct Bootstrap markup, Bootlint?</button>
EOF

In the browser

Bootlint can run directly in the browser! This is accomplished by using a bookmarklet, which appends bootlint to the body of the active page. There are a few nice benefits of running bootlint directly in the browser. They include:

Evaluating page markup after AJAX requests complete.
Evaluating pages that are dynamically created server-side (ex: CMS).
Evaluating pages/sites that do not have a build script.

How to install the bookmarklet

Please follow the instructions below to get up and running:

Create a new bookmark in your browser
Set the name/title equal to something that is easy to remember. Ex: Run Bootlint
Set the URL equal to

javascript:(function(){var s=document.createElement("script");s.onload=function(){bootlint.showLintReportForCurrentDocument([]);};s.src="https://stackpath.bootstrapcdn.com/bootlint/latest/bootlint.min.js";document.body.appendChild(s)})();

Note: The snippet above will ensure you are always running the latest version of bootlint. If you want to reference a specific version of bootlint please see the BootstrapCDN. Copy the URL and update s.src="PASTE-ME-HERE".

How to use the bookmarklet

Click the bookmark you created above
A popup will appear informing you if issues were detected
If issues exist, please open the developer tools and select the console tab

Alternative Options

Browser ready script

You can manually download the browser-ready version of Bootlint.

Lint problem explanations

For detailed explanations of each lint problem, look up the IDs (for example, E001 or W002) in our wiki.

API Documentation

Bootlint is a CommonJS module.

Bootlint represents the lint problems it reports using the LintError and LintWarning classes:

LintWarning
- Represents a potential error. It may have false-positives.
- Constructor: LintWarning(id, message, elements)
- Properties:
  - id - Unique string ID for this type of lint problem. Of the form "W###" (e.g. "W123").
  - message - Human-readable string describing the problem
  - elements - jQuery or Cheerio collection of referenced DOM elements pointing to all problem locations in the document
    - (Only available under Node.js): When available from the underlying HTML parser (which is most of the time), the DOM elements in the collection will have a .startLocation property that is a Location (see below) indicating the location of the element in the document's HTML source
LintError
- Represents an error. Under the assumptions explained in the above "Caveats" section, it should never have any false-positives.
- Constructor: LintError(id, message, elements)
- Properties:
  - id - Unique string ID for this type of lint problem. Of the form "E###" (e.g. "E123").
  - message - Human-readable string describing the problem
  - elements - jQuery or Cheerio collection of referenced DOM elements pointing to all problem locations in the document
    - (Only available under Node.js): When available from the underlying HTML parser (which is most of the time), the DOM elements in the collection will have a .startLocation property that is a Location (see below) indicating the location of the element in the document's HTML source

Bootlint defines the following public utility class:

Location (Only available under Node.js)
- Represents a location in the HTML source
- Constructor: Location(line, column)
- Properties:
  - line - 0-based line number
  - column - 0-based column number

A reporter is a function that accepts exactly 1 argument of type LintWarning or LintError. Its return value is ignored. It should somehow record the problem or display it to the user.

Browser

Bootlint exports a bootlint property on the global window object. In a browser environment, the following public APIs are available:

bootlint.lintCurrentDocument(reporter, disabledIds): Lints the HTML of the current document and calls the reporter() function repeatedly with each lint problem as an argument.
- reporter is a reporter function (see above for a definition). It will be called repeatedly with each lint problem as an argument.
- disabledIds is an array of string linter IDs to disable
- Returns nothing (i.e. undefined)
bootlint.showLintReportForCurrentDocument(disabledIds, alertOpts): Lints the HTML of the current document and reports the linting results to the user. Each warning will be output individually using console.warn().
- disabledIds is an array of string linter IDs to disable
- alertOpts is an optional options object with the following properties:
  - hasProblems (type: boolean; default: true) - window.alert() a single general notification message to the user if there are any lint problems?
  - problemFree (type: boolean; default: true) - window.alert() a notification message to the user if the document has no lint problems?
- Returns nothing (i.e. undefined)

Node.js

Example:

var bootlint = require('bootlint');

function reporter(lint) {
    console.log(lint.id, lint.message);
}

bootlint.lintHtml("<!DOCTYPE html><html>...", reporter, []); // calls reporter() repeatedly with each lint problem as an argument

In a Node.js environment, Bootlint exposes the following public API:

bootlint.lintHtml(html, reporter, disabledIds): Lints the given HTML for a webpage and returns the linting results.
- html is the HTML to lint, as a string
- reporter is a reporter function (see above for a definition). It will be called repeatedly with each lint problem as an argument.
- disabledIds is an array of string linter IDs to disable
- Returns nothing (i.e. undefined)

HTTP API

Bootlint can also be run as an HTTP server that exposes a very simple API. Use npm run start to run the server.

By default, it runs on port 7070. Set the $PORT environment variable to change which port it uses.

POST an HTML document to / and the document's lint problems will be returned as JSON.

The endpoint accepts an optional querystring argument named disable, whose value is a comma-separated list of linter IDs to disable.