You can follow YAML syntax and semantics to create YAML files as explained in previous post.

YAML Syntax

Below are some online tools to validate YAML/YML file . you just need to copy and paste there.

http://www.yamllint.com/

https://codebeautify.org/yaml-validator

http://beautifytools.com/yaml-validator.php

https://jsonformatter.org/yaml-validator

More

To know more about YAML Syntax, Configuration with Java and other supporting language, frameworks and tools, Sample configuration files and JSON and YAML conversion follow below YAML Tutorials and YAML related exceptions follow YAML Issues.

• YAML Tutorials
• YAML Issues and Solutions