# The Nu Html Checker (v.Nu) [![Chat room][1]][2] [![Download latest][3]][4]
[1]: https://goo.gl/1kHqwI
[2]: https://gitter.im/validator/validator
[3]: https://goo.gl/3PC2Qn
[4]: https://github.com/validator/validator/releases/latest
The Nu Html Checker (v.Nu) is the backend of [checker.html5.org][5],
[html5.validator.nu][6], and [validator.w3.org/nu][7]. Its [source code is
available][8], as are [instructions on how to build, test, and run the code][9].
It is released as two packages:
[5]: https://checker.html5.org/
[6]: https://html5.validator.nu
[7]: https://validator.w3.org/nu/
[8]: https://github.com/validator/validator
[9]: https://validator.github.io/validator/#build-instructions
* `vnu.jar` is a portable standalone version for [batch-checking documents
from the command line][10] and from other scripts/apps, or for [deploying the
checker as a self-contained service][11]
* `vnu.war` is for [deploying the checker service through a servlet container
such as Tomcat][12]
[10]: https://validator.github.io/validator/#usage
[11]: https://validator.github.io/validator/#standalone
[12]: https://validator.github.io/validator/#servlet
**Note:** The _vnu.jar_ and _vnu.war_ packages require a Java 8 environment;
they won’t run in Java 7 or older environment.
You can [get the latest release][13] or run [`npm install vnu-jar`][14], [`pip
install html5validator`][15] or [`brew install vnu`][16], and see the **Usage**
and **Web-based checking** sections below. Or automate your HTML checking with a
frontend such as:
[13]: https://github.com/validator/validator/releases/latest
[14]: https://www.npmjs.com/package/vnu-jar
[15]: https://github.com/svenkreiss/html5validator
[16]: https://libraries.io/homebrew/vnu
* [Grunt plugin for HTML validation][17] or [Gulp plugin for HTML
validation][18]
* [html5validator `pip` package][19] (for HTML checking integration in Travis
CI, CircleCI, CodeShip, [Jekyll][20], [Pelican][21] etc.)
* [LMVTFY: Let Me Validate That For You][22] (auto-check HTML of
JSFiddle/JSBin etc. links in github issue comments)
[17]: https://github.com/jzaefferer/grunt-html
[18]: https://github.com/watilde/gulp-html
[19]: https://github.com/svenkreiss/html5validator
[20]: https://jekyllrb.com/
[21]: https://blog.getpelican.com/
[22]: https://github.com/cvrebert/lmvtfy/
## Usage
Use the `vnu.jar` HTML checker as an executable for command-line checking of
documents by invoking it like this:
java -jar ~/vnu.jar [--errors-only] [--exit-zero-always]
[--no-stream] [--format gnu|xml|json|text] [--html] [--skip-non-html]
[--no-langdetect] [--help] [--verbose] [--version] FILES
**Note:** In these instructions, replace _"~/vnu.jar"_ with the actual path to
the file on your system.
To check one or more documents from the command line:
java -jar ~/vnu.jar FILE.html FILE2.html FILE3.HTML FILE4.html...
**Note:** If you get a `StackOverflowError` error when using the vnu.jar file,
try adjusting the thread stack size by providing the `-Xss` option to java:
java -Xss512k -jar ~/vnu.jar FILE.html...
To check all documents in a particular directory:
java -jar ~/vnu.jar some-directory-name/
To check all documents in a particular directory, skipping any documents whose
names don’t end with the extensions `.html`, `.htm`, `.xhtml`, or `.xht`:
java -jar ~/vnu.jar --skip-non-html some-directory-name/
To check a Web document:
java -jar ~/vnu.jar _URL_
example: java -jar ~/vnu.jar http://example.com/foo
To check standard input:
java -jar ~/vnu.jar -
example: echo '<!doctype html><title>...' | java -jar ~/vnu.jar -
### Options
When used from the command line as described in this section, the `vnu.jar`
executable provides the following options:
#### --errors-only
Specifies that only error-level messages and non-document-error messages are
reported (so that warnings and info messages are not reported).
default: [unset; all message reported, including warnings & info messages]
#### --exit-zero-always
Makes the checker exit zero even if errors are reported for any documents.
default: [unset; checker exits 1 if errors are reported for any documents]
#### --format _format_
Specifies the output format for reporting the results.
default: "gnu"
possible values: "gnu", "xml", "json", "text" [see information at URL below]
https://github.com/validator/validator/wiki/Service-%C2%BB-Common-params#out
#### --help
Shows detailed usage information.
#### --skip-non-html
Skip documents that don’t have *.html, *.htm, *.xhtml, or *.xht extensions.
default: [unset; all documents found are checked, regardless of extension]
#### --html
Forces any *.xhtml or *.xht documents to be parsed using the HTML parser.
default: [unset; XML parser is used for *.xhtml and *.xht documents]
#### --no-langdetect
Disables language detection, so that documents are not checked for missing
or mislabeled html[lang] attributes.
default: [unset; language detection & html[lang] checking are performed]
#### --no-stream
Forces all documents to be be parsed in buffered mode instead of streaming
mode (causes some parse errors to be treated as non-fatal document errors
instead of as fatal document errors).
default: [unset; non-streamable parse errors cause fatal document errors]
#### --verbose
Specifies "verbose" output. (Currently this just means that the names of
files being checked are written to stdout.)
default: [unset; output is not verbose]
#### --version
Shows the vnu.jar version number.
## Web-based checking with vnu.war or vnu.jar
The Nu Html Checkerーalong with being usable as [a standalone command-line
client][23]ーcan be run as an HTTP service, similar to [checker.html5.org][24],
[html5.validator.nu][25], and [validator.w3.org/nu][26], for browser-based
checking of HTML documents over the Web. To that end, the checker is released as
two separate packages:
[23]: https://validator.github.io/validator/#usage
[24]: https://checker.html5.org/
[25]: https://html5.validator.nu/
[26]: https://validator.w3.org/nu/
* `vnu.jar` for deploying the checker as a simple self-contained service
* `vnu.war` for deploying the checker to a servlet container such as Tomcat
Both deployments expose a REST API that enables checking of HTML documents from
other clients, not just web browsers. And the `vnu.jar` package also includes a
simple HTTP client that enables you to either send documents to a
locally-running instance of the checker HTTP serviceーfor fast command-line
checkingーor to any remote instance of the checker HTTP service running anywhere
on the Web.
The [latest releases of the vnu.jar and vnu.war packages][27] are available from
the `validator` project at github. The following are detailed instructions on
using them.
[27]: https://github.com/validator/validator/releases/latest
**Note:** Replace _"~/vnu.jar"_ or _"~/vnu.war"_ below with the actual paths to
those files on your system.
### Standalone web server
To run the checker as a standalone service (using a built-in Jetty server), open
a new terminal window and invoke `vnu.jar` like this:
java -cp ~/vnu.jar nu.validator.servlet.Main 8888
Then open [http://localhost:8888][28] in a browser. (To have the checker listen
on a different port, replace `8888` with the port number.)
[28]: http://localhost:8888
You’ll see a form similar to [validator.w3.org/nu][29] that allows you to enter
the URL of an HTML document and have the results for that document displayed in
the browser.
[29]: https://validator.w3.org/nu/
**Note:** If you get a `StackOverflowError` error when using the vnu.jar file,
try adjusting the thread stack size by providing the `-Xss` option to java:
java -Xss512k -cp ~/vnu.jar
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ReportUnit.sln 1KB ReportUnit.userprefs 957B ReportUnit Extensions XElementExtensions.cs 1009B packages.config 292B Program.cs 5KB ReportUnit.csproj 7KB Model Status.cs 2KB TestSuite.cs 829B RunInfo.cs 721B CompositeTemplate.cs 744B Test.cs 1KB Report.cs 2KB LICENSE 1KB Resources Templates SideNav.cs 991B File.cshtml 20KB Summary.cshtml 10KB TemplateManager.cs 925B Schemas JUnit.xsd 4KB ReportUnitService.cs 4KB Logging Level.cs 147B Log.cs 378B Logger.cs 2KB Parser ParserFactory.cs 5KB XUnitV2.cs 65B Gallio.cs 7KB TestRunner.cs 178B NUnit.cs 12KB XUnitV1.cs 65B MSTest2010.cs 6KB JUnit.cs 9KB IParser.cs 140B App.config 1011B Properties AssemblyInfo.cs 1KB Utils DateTimeHelper.cs 669B ReportUtil.cs 919B cdn reportunit.js 8KB reportunit.css 9KB LICENSE 1KB appveyor.yml 1KB ReportUnitTest packages.config 130B ReportUnitTest.csproj 3KB Resources JUnit TestSuiteAndCasesSingleVsMultiple test_junit_one_testsuite_one_testcase.xml 359B test_junit_multiple_testsuite_multiple_testcases.xml 1KB test_junit_one_testsuite_multiple_testcases.xml 840B TestCaseAttributes test_junit_skipped_tests.xml 966B vnu.jar_17.2.1 LICENSE 1KB vnu.jar.orig 23.94MB README.md 14KB
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