# html-validator-cli [](https://circleci.com/gh/iij-ii/html-validator-cli)
Command Line Interface for [The W3C Markup Validation Service](https://validator.w3.org/)
```sh
$ cat /var/www/html/index.html
Hello, Validator!
$ validatehtml /var/www/html/index.html
[ERROR] The character encoding was not declared. Proceeding using “windows-1252”.
[ERROR] Element “head” is missing a required instance of child element “title”.
From line 2, column 7; to line 3, column 10
ml> Hello,
^^^^^^^^^^^
[WARNING] Consider adding a “lang” attribute to the “html” start tag to declare the language of this document.
From line 1, column 16; to line 2, column 6
TYPE html> <
^^^^^^^
```
## Usage
```
Usage: validatehtml [-u URL] [-x DIR] FILE | DIR ...
-s URL --validator-url=URL validation service url (default: https://validator.w3.org/nu/)
-x DIR --exclude=DIR exclude files in DIR
-1 --oneline print each message on one line
```
- `FILE | DIR ...`
- Specify one or more HTML files to validate. When a directory is specified, all HTML files under that will be checked.
- `-s URL`, `--validator-url=URL`
- Specify the alternative validation service that uses [The Nu Html Checker](https://validator.github.io/validator/) as its backend like follows:
- https://checker.html5.org/
- https://html5.validator.nu/
- or your self-hosted The Nu Html Checker instance.
- `-x DIR`, `--exclude=DIR`
- Specify the folder name that you want to exclude from checking.
- `-1`, `--oneline`
- Specify it if you want to print the validation result in compact format.
## License
Copyright (c) IIJ Innovation Institute Inc.
Licensed under The 3-Clause BSD License.