Grunt plugin for html validation
JavaScript HTML PHP
Latest commit 291cf04 Jul 4, 2016 @XhmikosR XhmikosR committed on GitHub Merge pull request #100 from jzaefferer/dev
Update vnu.jar, fix tests and minor cleanup


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Grunt plugin for HTML validation, using the vnu.jar markup checker.

Getting Started

Install this grunt plugin next to your project's Gruntfile.js with:

npm install grunt-html --save-dev

Then add this line to your project's Gruntfile.js:


Then specify what files to validate in your config:

  htmllint: {
    all: ["demos/**/*.html", "tests/**/*.html"]

For fast validation, keep that in a single group, as the validator initialization takes a few seconds.



  • Type: Array, String, or RegExp
  • Default: null

Use this to specify the error message(s) to ignore. For example:

all: {
  options: {
    ignore: 'The “clear” attribute on the “br” element is obsolete. Use CSS instead.'
  src: "html4.html"

The ignore option also supports regular expressions. For example, to ignore AngularJS directive attributes:

all: {
  options: {
    ignore: /attribute “ng-[a-z-]+” not allowed/
  src: "app.html"


  • Type: Array
  • Default: 'info','warning','error'

Set errorlevels to control which error types are returned from the validator. Ignores all other returned types.


  • Type: Boolean
  • Default: false

Set force to true to report errors but not fail the grunt task.


  • Type: String
  • Default: null

Allows you to modify the output format. By default, this plugin will use a built-in Grunt reporter. Set the path to your own custom reporter or to one of the provided reporters: checkstyle, junit or json.


  • Type: String
  • Default: null

Specify a filepath to output the results of a reporter. If reporterOutput is specified then all output will be written to the given filepath rather than printed to stdout.


  • Type: Boolean
  • Default: false

Set absoluteFilePathsForReporter to true to use absolute file paths in generated reports.

Travis CI potential pitfalls

Since vnu.jar requires Java 8 environment, you might have trouble setting Travis CI to work with grunt-html. In that case see this patch and the Travis CI doc page.


Copyright Jörn Zaefferer.
Licensed under the MIT license.