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Yaml validator

World's simplest yaml tool

Quickly check Yet Another Markup Language syntax for errors. Enter your YAML in the input box below and you'll immediately get its syntax validated. Enter YAML, get it validated. There are no ads or downloads, and everything works right in your browser. Made by developers for developers.
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Yaml validator tool What is a yaml validator?
This YAML validator checks the syntax of YAML (Yet Another Markup Language) data. If there are mistakes, then it returns a detailed syntax error message that explains what happened. It also tells the position of error and displays the conflicting snippet.
Yaml validator examples Click to use
Invalid YAML Syntax
Invalid YAML file. It displays and error and a explains what happened.
plain text is not yaml
Valid YAML Syntax
Valid YAML data without any errors. All checks pass and you get a green badge.
list: - entry1 - entry2 - entry3
Pro tips Master online yaml tools
You can pass input to this tool via ?input query argument and it will automatically compute output. Here's how to type it in your browser's address bar. Click to try!
https://onlineyamltools.com/validate-yaml?input=plain%0Atext%0Ais%0Anot%0Ayaml
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