Carbon.txt validator

This validator reads carbon.txt files, and validates them against a spec defined on http://carbontxt.org.

Usage

With the CLI

Run a validation against a given domain, or file, say if the file is valid TOML, and it confirms to the carbon.txt spec.

The following commands assume you are working in a virtual environment:

# parse the carbon.txt file on default paths on some-domain.com
carbon-txt validate domain some-domain.com

# parse a remote file available at https://somedomain.com/path-to-carbon.txt
carbon-txt validate file https://somedomain.com/path-to-carbon.txt

# parse a local file ./path-to-file.com
carbon-txt validate file ./path-to-file.com

# pipe the contents of a file into the file validation command as part of a pipeline
cat ./path-to-file.com | carbontxt validate file

Using UV

If you are not using virtual environments directly, you can use it with uv, which is the recommended way to run the project.

Add carbon-txt-validator to a project with uv add:

uv add carbon-txt-validator

You can now run the command line tool with uv run carbon-txt

Running outside a project

If you have uv installed, you can run the command line tool using the slightly longer carbon-txt-validator command instead (we need a cli command that shares the name of the project).

This will download the latest published version from pypi and run the cli:

uv tool run carbon-txt-validator validate ./path/to/file

With the HTTP API

You can also validate carbon.txt files sent over an HTTP API.

# run the carbon-txt validator as a server using the default django server. Not for production
carbon-txt serve

For production, Granian, a performant webserver is bundled. Pass the flag --server granian to use it.

# run the carbon-txt validator as a server using the production granian server
carbon-txt serve --server granian