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alexrutar/validate_html.md

Last active August 20, 2023 13:08
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Validate HTML using the W3C API from the command line.
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validate_html.md

We can use httpie to make requests to the W3C validator. For example, to test the file index.html, run

https "https://validator.w3.org/nu/?out=gnu" @index.html "Content-Type: text/html; charset=utf-8" --print 'b'

and any errors or warnings will be printed to STDOUT. You can also get the error format in JSON by using the out=json syntax.

Another option which can be done locally is to use the python html5validator. For example, if all your files are in a directory called html, calling

html5validator --root html/ --also-check-css --show-warnings

will check all .html files as well ass .css files in that directory, and print warnings as well as errors.

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