YAML Validator

Validate YAML online and find out if there are any errors. Check YAML syntax easily, quickly and safely!

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Fast and Easy YAML Validator

YAML Validator is free to use tool which helps to validate your config file. The application works well on Windows, Mac, Linux, Chrome, Firefox, Edge, and Safari. YAML Validator is easy to use and works right in your browser. It quickly checks if the YAML syntax is valid. If so, the formated Yaml code will be displayed accordingly. Otherwise, errors will be printed, including line numbers, so you can quickly correct them. Simply enter a source code or YAML file and get a verified one at once! There are no limits to taking the YAML Validator, so feel free and validate your config files as much as you need!

YAML (Ain't Markup Language) is a human-friendly data serialization language widely used for common everyday tasks in almost all programming environments. YAML is generally considered to be easier to read than more verbose JSON or XML. It is most often used in config files of servers and software applications. YAML excels in working with common dynamic languages such as JavaScript, Perl, PHP, Python and Ruby. Use our YAML Validator and quickly check YAML syntax for errors!
  • Quick and secure way to validate YAML file
  • High performance & High quality
  • Works from your favorite device
  • Your files' safety is our priority
  • No limits, no registration and software installation

How to validate YAML

  • Enter the source YAML code to the text area “Source code“: copy the YAML code and paste it to the text field. Also, you can upload the YAML file from a local file system.
  • Push the “Validate“ button to start checking. Please wait a few seconds. The result will appear in the text field.
  • The verification result will be available instantly after its completion. The YAML validator checks the syntax of YAML data. If there are errors, it returns a detailed syntax error message indicating the position of the error. If there are no mistakes, it returns the formatted YAML code.
  • You can copy or download the verification result.


  • How to use the YAML validation tool?Enter your YAML code or upload a YAML file and click on the “Validate“ button. The application will check YAML syntax and you will get the result of validation below in the next form.
  • How long does it take to validate YAML?This free online YAML Validator works fast. You can check YAML syntax and get a list of errors in just a few seconds.
  • Can I use this application on Windows, Linux, Mac OS, Android or iOS?You can use free YAML Validator on any operating system that has a web browser. Easily check your YAML file regardless of whether you are using Windows, Mac OS, Linux, Android, or iPhone. Just copy the YAML code, paste and validate!
  • Why is YAML so popular?YAML (Yet Another Markup Language) is popular because it is easy for humans to read. In addition, it is portable between programming languages such as JavaScript, Perl, PHP, Python, Ruby and matches the native data structures of dynamic languages; has a consistent model to support generic tools; is expressive & extensible, and is easy to implement & use.
  • Fast and Easy Way to Validate YAML

    Just paste your YAML code to the text area above and click the “Validate“ button and you will get the result of validation below in the next form.
  • Validate YAML Anywhere

    It works from all platforms including Windows, Linux, Mac OS, Android and iOS. All files are processed on our servers. No plugin or software installation required for you.
  • Validation Quality

    All data are processed using Aspose APIs established well in the software industry and used by many Fortune 100 companies across 114 countries.
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