Developer Tools
Validate YAML for common syntax and indentation issues.
Use this YAML validator to check for common syntax problems such as tabs, broken indentation, malformed list items, and quote issues. It is useful for config files, CI pipelines, deployment manifests, and any workflow where invalid YAML can break automation or deployment.
Use this YAML validator to check for common syntax problems such as tabs, broken indentation, malformed list items, and quote issues. It is useful for config files, CI pipelines, deployment manifests, and any workflow where invalid YAML can break automation or deployment.
Use yaml validator when you need a fast browser-based result without extra setup. It works well for quick checks, one-off tasks, and routine formatting or calculation work.
Read step-by-step usage guidance, best practices, and common mistakes.
See common questions and answers about input, output, and tool usage.
Review practical input and output examples before running the tool.
Find similar and supporting tools for adjacent actions and follow-up tasks.
Input
services:
web:
image: nginx Output
Valid YAML
A correctly indented YAML structure passes validation.
Input
services: web: image: nginx
Output
Invalid YAML
Mixed tabs and broken indentation can cause validation errors.
Fix: Replace tabs with spaces and recheck the YAML.
Fix: Review the nesting carefully and keep indentation aligned.
Fix: Use the YAML formatter if layout is the main problem rather than validity.
It checks common YAML problems such as tabs, inconsistent indentation, malformed list items, and simple quote issues.
No. It focuses on practical syntax validation for common YAML mistakes in everyday config files.
It is useful before saving, deploying, or committing YAML files that must parse correctly.
Yes. It works online in the browser.
Use the validator when you want to catch syntax mistakes. Use the formatter when you mainly want cleaner spacing and layout.