Free online tool
YAML Validator
Check common YAML syntax and indentation issues.
Updates automatically in your browser.
Paste JSON, XML or YAML to validate.
How to use this tool
- 1. Paste your documentAdd the JSON, XML or YAML you want to validate.
- 2. Check the statusValid documents appear in green; errors show line and column details.
- 3. Fix and recheckUse Go to error, edit the source and review the updated status.
Frequently asked questions
Is this a complete YAML specification parser?
No. It checks common YAML mappings, lists, indentation and malformed lines without adding a large parser dependency.
What input does YAML Validator expect?
Use the format shown by the workspace fields and examples. Check common YAML syntax and indentation issues.
What happens when YAML Validator receives invalid input?
The tool displays validation feedback or an error instead of silently returning an unreliable result.
Tool guide
About YAML Validator
What is YAML Validator?
YAML Validator is a free browser-based utility designed to check common yaml syntax and indentation issues.
Developer tools support inspection, validation and debugging.
When to use YAML Validator
Use this tool for a quick result without installing a separate application.
Review important results in the destination system.
Practical tips
Check the input format before relying on the result.
Keep a copy of important original data.
Privacy and processing
This tool is designed to process its working input in your browser.
Avoid confidential material on an untrusted device.
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