How it works
How to use the YAML Validator
Paste YAML
Kubernetes manifests, Compose files, CI configs — anything.
Read the report
Each problem is listed with its line and column and underlined in the editor.
Fix it
The report updates as you type.
What is checked
The YAML 1.2 parser reports syntax errors, inconsistent indentation, tabs used for indentation, duplicate keys and unresolved aliases. Multi-document streams separated by --- are supported.
Built for developers
Why developers use it
Private by design
Runs 100% in your browser. Nothing you paste is uploaded, logged or stored on a server.
Instant results
Output updates as you type, with precise error locations when something is wrong.
Works offline
Once loaded, the tool keeps working without a connection. Install it as an app if you like.
Free, no sign-up
No accounts, no limits, no watermarks.
FAQ
Frequently asked questions
Does it validate Kubernetes schemas?
It checks YAML syntax, not the Kubernetes API schema.
Is my data uploaded anywhere?
No. Everything runs locally in your browser — nothing you paste or open is sent to a server, logged or stored. The tool keeps working offline once the page has loaded.
Keep going
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