Yamllint
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Use an online validator like https://www.yamllint.com/ or https://jsonformatter.org/yaml-validator
Of course, you should have one in your local tools and CI pipeline to ensure that your Yaml is always correct.
You can't just use "one" solution though. The leading GPL linter is based on Python, so depending on your code repo, you may instead want to use a JavaScript or PHP implementation. Thus, tools like wp:Grunt (software) may be used to automate JSHint linting in JavaScript projects[1].
