YAML Validator
Validate YAML syntax and convert YAML to JSON — instantly in your browser. Catches tabs mixed with spaces, duplicate keys, and structural errors in Kubernetes manifests, Docker Compose files, GitHub Actions workflows, and CI/CD pipelines. Free, private, and no account required.
How to Use the YAML Validator
- 1
Paste your YAML
Paste your YAML content — a Kubernetes manifest, Docker Compose file, GitHub Actions workflow, or any other YAML — into the input area.
- 2
Click Validate
Click "Validate" to check for syntax errors — tabs mixed with spaces, duplicate keys, and structural issues are reported with their location.
- 3
Convert to JSON
Click "Convert to JSON" to see the parsed data structure as JSON, confirming that your YAML is being interpreted as intended.
- 4
Copy the output
Use the Copy button to copy the JSON output for inspection or debugging.
Key Features
Validation + Conversion
Both validate syntax and convert to JSON in one tool — see errors and confirm structure.
Common Error Detection
Catches tabs mixed with spaces, duplicate keys, and inconsistent indentation.
Private
Kubernetes secrets, API keys in workflows, and sensitive config files never leave your browser.
Pro Tips
YAML explicitly forbids tab characters for indentation — always use spaces. If your editor uses tabs, configure it to expand tabs to spaces for YAML files.
Use the YAML-to-JSON conversion to verify that nested values are at the correct depth — a missing space of indentation can silently move a value to the wrong level.
In YAML, strings containing : or # characters must be quoted to avoid being parsed as key-value separators or comments.
Privacy Note
All processing in this tool runs entirely in your browser — no data is transmitted to any server. Your input is never logged, stored, or shared. This tool is free to use with no account or registration required.
Frequently Asked Questions
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