YAML Validator

When to use?

Use it to find indentation and syntax errors in YAML files for CI configs, Docker Compose, or Kubernetes manifests. Errors show the line/column and cause; valid YAML shows the converted JSON.

How to use

• Paste the YAML to check.
• Review the result and any error positions (line/column).
• Copy or download the converted JSON when valid.

Input Explanation

Enter the YAML document. Indentation must use spaces (tabs are not allowed).

Calculation Basis

It parses with the yaml library’s parseDocument to collect errors/warnings; when valid, it serializes toJS() output as JSON.

Usage Examples

• CI & infra config - Catch syntax errors in Actions/Compose/K8s YAML before deploying.
• YAML → JSON - See how YAML is interpreted as JSON.

Examples

• Tab indentation → error line/column and cause
• Valid YAML → JSON preview

Cautions

• YAML does not allow tab indentation — use spaces.
• It validates syntax only, not resource schemas (e.g. Kubernetes specs).

FAQ

Does it show error positions?

Yes — the failing line and column plus the cause.

Does it also convert to JSON?

Valid YAML is previewed as JSON and can be copied or downloaded.

Is my data uploaded?

No. All checks run only in your browser.

Related Tools

• YAML ↔ JSON Converter - Convert YAML and JSON data bidirectionally in the browser.
• JSON Formatter - Beautify or minify JSON strings instantly and check for validity errors.
• XML Validator - Check whether XML is well-formed, view error messages, and get a tidy indented version.
• UUID Generator - Generate up to 20 cryptographically secure UUID v4 values at once.
• Password Generator - Generate secure random passwords in the browser by choosing length, character set, and count.
• JWT Decoder - Decode a JWT header and payload to view the JSON and key claims.