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Developer Utility

YAML Validator

Paste YAML code to check syntax errors, indentation issues, missing colons, array structure problems, and view the converted JSON result.

YAML Syntax Validation Quickly check syntax errors in Docker Compose, GitHub Actions, and Kubernetes configuration files.
Error Location Check Review indentation, colon, and quotation issues through parsing error messages.
JSON Conversion Support Convert valid YAML into JSON to inspect the structure more clearly.

YAML Input

Paste the YAML code you want to validate below.

Syntax Validation Parse the entered YAML in the browser to check syntax and structural errors.
Structure Check When validation succeeds, the JSON conversion result is shown together so you can inspect objects and arrays.
0 lines 0 chars Keys 0 Waiting for validation

Validation Result

Check the YAML syntax status, error messages, and JSON conversion result.

Ready 
Enter YAML code and click the Validate YAML button.

YAML Use Cases

YAML is often used in configuration files, where indentation and structure are important.

Docker Compose

YAML syntax is frequently used in configuration files with many hierarchical structures such as services, volumes, and networks.

GitHub Actions

Automation settings such as workflow, jobs, steps, uses, and run are written in YAML.

Kubernetes

YAML format is widely used for resource definition files such as Deployment, Service, and ConfigMap.

Help

When should I use a YAML Validator?

Use it to quickly check errors in YAML-sensitive files such as Docker Compose, GitHub Actions, Kubernetes settings, CI/CD settings, and server deployment configuration.

YAML is sensitive to indentation and spacing, so validating syntax before deployment can reduce configuration errors.

Common YAML Errors

  • Indentation spaces do not match.
  • There is no space after a colon (:).
  • Array (-) and object structures are mixed incorrectly.
  • Quotation marks are not closed.
  • Tabs and spaces are mixed for indentation.
Why is indentation important in YAML?

YAML represents hierarchy using indentation instead of braces. Items at the same level must use the same number of spaces, and child items must be indented further than their parent items.

Can I use tabs in YAML?

In YAML, spaces are recommended instead of tabs for indentation. It is safer to configure your editor to convert tabs into 2 or 4 spaces.

Is a space required after a colon in YAML?

For common key-value structures, it is safer to write a space after the colon, such as name: value. Writing name:value without a space may be interpreted differently or cause an error.

Why convert YAML to JSON?

The JSON conversion result clearly shows the object, array, string, and number structure of the YAML. It is useful when checking whether a configuration file is parsed as intended.

Can I enter sensitive configuration files?

This tool validates YAML in the browser. Still, it is recommended to remove or mask passwords, API keys, tokens, and server connection information before entering them.