YAML Formatter

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YAML Formatter & Validator — Beautify, Validate and Convert YAML to JSON

Clean up YAML config files with proper indentation, validate them against real YAML syntax, and convert between YAML and JSON in one click. Whether you're wrestling with a Kubernetes manifest, a GitHub Actions workflow, a docker-compose file, or an app config, this editor catches indentation and syntax mistakes instantly.

YAML is indentation-sensitive in ways that are easy to get wrong and painful to debug. The validator pinpoints errors so you fix them in seconds, and the YAML↔JSON conversion gives you a bridge to any tooling that only speaks JSON. Everything runs locally — your configs, secrets, and infrastructure definitions never leave your browser.

How to format and validate YAML

  1. Paste your YAML into the input editor.
  2. Click Format to normalize indentation and clean up the output.
  3. Use Validate to check syntax — errors are reported with their location.
  4. Convert to JSON (or JSON back to YAML) with the conversion buttons when needed.
  5. Copy the result with one click.

Frequently asked questions

Why does my YAML keep failing to parse?

The usual culprits are inconsistent indentation (YAML forbids tabs and requires consistent spaces), unquoted special characters like colons inside values, and missing spaces after hyphens or colons. Run the validator — it points you at the exact line.

How do I convert YAML to JSON?

Paste the YAML and click the YAML→JSON button. The parse runs locally and prints standard JSON. The reverse button converts JSON back into clean YAML — handy for generating config files from API responses.

Is my YAML file uploaded anywhere?

No. Parsing, formatting, and conversion all happen in your browser. Config files often contain secrets, hostnames, and internal infrastructure details — they never leave your device here.

Can it handle large YAML files?

Yes. Everything runs at native speed in your browser with no network round-trip, so even long pipeline and manifest files format in milliseconds.

Is YAML better than JSON for configuration?

YAML supports comments, anchors, and multiline strings, which make it friendlier for human-maintained config. JSON is stricter and easier for machines. With one-click conversion in both directions, you don't have to choose — keep sources in YAML and generate JSON when a tool requires it.

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PureKit · yaml · Free online tool — files processed locally in your browser, no upload.