YAML Validator
Validate YAML syntax and catch indentation issues quickly.
What this tool does
Validate YAML syntax for configuration files and deployment manifests, including indentation-sensitive structures used in CI and infrastructure tooling.
Tool interface
Input
Output
Example input
version: 1
services:
api:
image: node:20
ports:
- 3000:3000Example output
Valid YAML.
Step-by-step instructions
- Paste YAML content into the input area.
- Click Transform to validate syntax.
- Review the result and fix any line/indentation errors.
Common use cases
- Catching malformed input before import or deployment.
- Checking payload structure during debugging and QA.
- Preventing format-related errors in downstream tools.
Catches syntax mistakes before YAML files break deployments, pipelines, or application startup.
Common mistakes to avoid
- Mixing tabs and spaces in indentation.
- Forgetting list item markers (`-`) for sequence values.
- Using invalid key-value formatting in nested blocks.
Frequently Asked Questions
Does YAML Validator check schema rules?
No. It validates YAML syntax only, not domain-specific schemas.
Can YAML Validator catch indentation errors?
Yes. Invalid indentation is reported as a parse error.
Can I validate Kubernetes manifests?
Yes. It validates YAML structure used in Kubernetes files.
What input format does YAML Validator expect?
Use the format shown in the example input on this page.
What does YAML Validator output?
It returns transformed output that you can copy directly from the result panel.
Why might YAML Validator return an error?
A common issue is: Mixing tabs and spaces in indentation.
Does YAML Validator run in the browser?
Yes. Transformations are designed for in-browser usage so you can test and iterate quickly.
Can I copy or download results from YAML Validator?
Yes. You can copy transformed output directly from the tool.
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