The Nu Html Checker
A markup checker for finding errors in HTML, CSS, and SVG files from the command line or a service.
By The Nu Html Checker contributors
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Read the The Nu Html Checker documentation
View the The Nu Html Checker source code
Alternatives
Nu Html Checker
W3C Markup Validation Service
W3C CSS Validation Service
HTMLHint- HTMLProofer
- HTML-validate
About The Nu Html Checker
The Nu Html Checker, also called vnu, checks HTML, CSS, and SVG documents for unintended mistakes. You can run it from the command line, use it in scripts, or deploy it as an HTTP service with a browser interface and REST API.
It offers binaries for Linux, Windows, and macOS, plus a portable JAR or a WAR for servlet containers. The portable Java packages require Java 17 or later; the precompiled platform binaries include a Java runtime.
Strengths
- Checks HTML, CSS, and SVG
- Can run in scripts or as a self-hosted HTTP service
- Provides precompiled binaries for three desktop platforms
Limitations
- The portable JAR and WAR packages require Java 17 or later
- Deploying the WAR package requires a servlet container such as Tomcat
Details
- Pricing
- FreeFree and open source under the MIT license.
- License
- MIT
- Developer
- The Nu Html Checker contributors
- Platforms
- Windows, macOS, Linux, Self-hosted, Command line
- How it runs
- Downloadable app, Self-hosted
- Best suited for
- Web developers checking markup locally or in automated workflows
- Categories
- Developer tools, Website testing
- Last verified
- Added
- Provenance
- Selected from the Homebrew formula