Sep 12, 2026
YAML Validator: The Indentation Error Your Editor Won’t Catch
Check and clean YAML.
Read postYAML Validator / Formatter
Check and clean YAML.
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About YAML Validator / Formatter
Validate indentation-based YAML and normalize scalars, lists, and maps.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Frequently Asked Questions about YAML Validator / Formatter
How do I use the YAML Validator / Formatter?
Open the YAML Validator / Formatter and use the controls in the workspace below: check and clean yaml. Results appear instantly in your browser, with nothing to install, sign up for, or pay for.
Is the YAML Validator / Formatter free?
Yes. The YAML Validator / Formatter is completely free, like every tool in the PrimeFreeTools library. There are no accounts, subscriptions, or usage limits.
Does the YAML Validator / Formatter store or share my data?
No. The YAML Validator / Formatter runs with JavaScript in your browser, so what you enter never leaves your device and nothing is stored on a server.
What can I use the YAML Validator / Formatter for?
Validate indentation-based YAML and normalize scalars, lists, and maps. You will find it grouped under Developer Tools together with 75 other free tools on the PrimeFreeTools homepage.