მთავარი მიღებული
- 01Formats YAML with consistent indentation using the js-yaml parser — the same library used in Node.js build tooling.
- 02Validates syntax and reports exact line numbers for errors.
- 03Converts between YAML and JSON in both directions with correct type preservation.
- 04Nothing is uploaded — the entire operation runs locally in your browser.
Why YAML Formatting Matters for Config Files
YAML is the default config language for Kubernetes, GitHub Actions, Docker Compose, Helm charts, and many more tools. It's also famously sensitive to indentation — a single mis-indented line can produce a silent type mismatch or a hard parse error that blocks a deployment. Formatting regularly keeps files consistent and catches issues before they reach CI.
Converting between YAML and JSON is equally useful. Some tools only accept JSON for API calls or schema definitions, while humans generally prefer YAML for long-lived config files. Being able to round-trip between the two without losing data types — numbers stay numbers, booleans stay booleans — saves time and prevents subtle bugs.
How to Format or Convert YAML
- 01
Paste your YAML or JSON
Paste a Kubernetes manifest, a GitHub Actions workflow, a Helm values file, or any other YAML document. For JSON-to-YAML conversion, paste JSON instead.
- 02
Choose an action
Select Format YAML to normalize indentation and clean up the document in place. Select YAML to JSON or JSON to YAML to convert the format entirely.
- 03
Review errors if any
If the input has a syntax error, the tool surfaces the exact line number and reason from the js-yaml parser — the same parser your Node.js tooling uses, so the error matches what you'd see in production.
- 04
Copy the output
Click Copy to grab the formatted or converted output. Paste it back into your config file, an API body, or a schema definition.
When This Tool Saves You Time
- 01Kubernetes manifest has drifted — normalize indentation before committing.
- 02GitHub Actions workflow fails to parse — validate to get the exact error line.
- 03API only accepts JSON but config is stored as YAML — convert with one click.
- 04Onboarding a new service — convert the JSON example payload to YAML for the Helm chart.
- 05Copying YAML from Stack Overflow — reformat to match your project's 2-space style.
- 06Debugging a Helm values merge — validate that each values.yaml is individually clean.
Private, No Upload Required
Formatting and conversion run entirely in your browser using js-yaml — the same library bundled into Webpack, Rollup, and most JavaScript build tools. Your config files, secrets references, and environment variable names never leave your device.
The parser targets YAML 1.2, which is what Kubernetes, GitHub Actions, and Docker Compose all use. If a file validates here, it will load correctly in those tools.
YAML Formatter FAQ
Will YAML formatting preserve comments?
No. The js-yaml parser strips comments during parsing — this is a limitation of all JavaScript YAML parsers. Format first, then add comments back manually.
What YAML version does this support?
YAML 1.2, which is the version used by Kubernetes, GitHub Actions, Docker Compose, and Helm. What validates here will load cleanly in those tools.
Does converting from YAML to JSON preserve types?
Yes. Numbers, booleans, null, and date strings round-trip correctly. A true in YAML becomes a boolean true in JSON, not the string 'true'.
What's the difference between formatting and converting?
Formatting keeps the file as YAML and normalizes whitespace and indentation. Converting changes the output format entirely — YAML to JSON produces a .json-compatible document.
My YAML has multiple documents separated by ---. Will they all be processed?
The first document is parsed and re-emitted. For multi-document files, split each section on --- and process them individually.