Xmllint: For Windows !!exclusive!!

If your XML is a single messy line, use the --format flag to make it human-readable: xmllint --format input.xml > output.xml Use code with caution.

It worked.

For users comfortable with the CLI, xmllint is incredibly fast. Because it processes files locally without loading a heavy interface (like XMLSpy or Visual Studio), it can validate gigabyte-sized XML files in seconds that would crash a GUI editor. xmllint for windows

The most basic use case. Running xmllint --noout file.xml checks if tags are closed and nested correctly. If your XML is a single messy line,