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YAML Validator
This tool allows you to quickly validate your YAML code and identify any syntax or formatting errors that may prevent it from working correctly. Even small issues—such as incorrect indentation, missing colons, or invalid characters—can cause YAML parsers to fail or return unexpected results.
By validating your YAML before using it, you can ensure that your data is structured properly and ready to be processed, extracted, or converted without errors. Simply paste your YAML code into the field below and click “Validate Code” to instantly see detailed feedback, including the exact location of any problems that need to be fixed.
YAML code
Results
Your YAML is checked in your browser and nothing is uploaded.
How to use it
The YAML validator is a handy tool that will let you know if there are errors in your YAML files.
- Add your YAMLCopy and paste your YAML code into the editor above, or use Open file to load a
.yamlor.ymlfile. - ValidateThe code is checked as you type. You can also click Validate code, or press Ctrl+Enter, to check it straight away.
- Find the problemIf there are any errors, the tool tells you the line and column, marks the line in the editor and shows the lines around it. Use Go to line to jump there.
- Fix and check againAny errors in your YAML file should be fixed for it to work correctly. The result updates as soon as you change the code.
Good to know
Spaces, not tabs
YAML uses spaces to show structure, and tabs are not allowed for indentation. Lines at the same level must have the same number of spaces.
Look one line up
A parser sometimes only notices a problem on the line after it, such as a missing colon. If the marked line looks right, check the line above it.
More than one document
A file can hold several documents separated by ---. They are all checked, and each one is listed in the result.
Frequently asked questions
What does this validator check?
It checks that your text is well-formed YAML: the indentation, colons, dashes, quotes and brackets, and that no key is repeated within the same mapping. It does not check whether the values make sense for a particular program, such as a Docker or Kubernetes file.
Why does it say a duplicate key is an error?
The YAML rules say the keys in a mapping must be unique. Some programs quietly keep only one of the repeated keys, which hides mistakes, so the validator reports them.
Why is the line it shows not the line with my mistake?
Some mistakes can only be seen once the parser reaches the next line. A missing colon is a common one. Look at the marked line and the line above it.
Can I validate a file that has several documents?
Yes. Documents separated by a line with three dashes are all checked, and the result lists each one.
Is my YAML uploaded?
No. The checking is done in your browser and nothing is sent anywhere.
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