Data Formats utility
YAML Validator
Check YAML syntax and locate parsing errors.
● This tool runs entirely in your browser. Your input is never uploaded to our servers.
Output
Your result will appear here…
How to use YAML Validator
- Paste a YAML document.
- Select Validate to check its syntax.
- Fix any reported issue and validate again.
Example
Input:
server: port: 3000 enabled: true
Output:
Valid YAML ✓
Use cases
- Check application configuration.
- Catch indentation and quoting mistakes.
- Validate sample YAML before sharing it.
About this tool
Check YAML syntax and locate parsing errors. Processing happens locally in your browser, so your input is not sent to a server or included in analytics.
Frequently asked questions
Does validation change my input?
No. Validation reports whether the document parses and does not modify your text.
Are duplicate keys allowed?
Duplicate mapping keys are reported as errors to avoid ambiguous data.
Does the text leave my browser?
No. Validation runs locally.