YAML Validator

Check whether YAML is syntactically valid before deploying configs or debugging CI pipelines. Paste your YAML and click Run to validate it.

  • Runs entirely in your browser
  • No data stored or sent to a server
  • Free forever — no signup
  • Instant conversion

Input and Output

Use the interactive encoder and decoder on this page to process your text.

Learn more about YAML validation

How to Validate YAML Syntax

YAML Validation

When to Validate YAML

Validate YAML before deploying configs, pushing CI workflow changes, or applying Kubernetes manifests. Catch indentation errors and syntax issues early.

Common YAML Errors

  • Tabs instead of spaces for indentation
  • Inconsistent indent levels in nested structures
  • Unquoted special characters in scalar values
  • Missing colons after keys

Frequently asked questions

Does validation check schema or just syntax?

This tool checks YAML syntax only. It does not validate against Kubernetes, OpenAPI, or other schemas.

Can I validate multi-document YAML?

The parser processes the first document. For multi-document files (--- separators), validate each document separately.