Format and validate YAML, or convert between YAML and JSON. Essential for Kubernetes, Docker, and CI configs.
The ByteKiln YAML Formatter uses js-yaml, a full-featured YAML 1.2 parser, to parse and re-serialize your input. All processing runs locally in the browser.
Parses the YAML input and re-serializes it with consistent 2-space indentation and normalized key ordering. Catches and reports syntax errors including indentation problems, duplicate keys, and invalid anchors.
Parses the YAML document and serializes it as a pretty-printed JSON object. Useful when an API or tool requires JSON but your source config is in YAML.
Parses the JSON input and re-serializes it as human-readable YAML. Useful for creating editable config files from machine-generated JSON.
Short answers for the things developers usually ask before trusting a tool.
YAML (YAML Ain't Markup Language) is a human-readable data serialization format used extensively in DevOps and infrastructure tooling. Kubernetes manifests, Docker Compose files, GitHub Actions workflows, Ansible playbooks, and most CI/CD pipelines (GitLab CI, CircleCI, Travis CI) use YAML for configuration.
The formatter handles single YAML documents. Multi-document YAML (documents separated by ---) processes the first document only. For multi-document files, split them before formatting.
YAML is a superset of JSON — valid JSON is also valid YAML. YAML adds comments, multiline strings, anchors/aliases for repeated values, and a less verbose syntax. JSON is simpler and more portable for APIs. YAML is better for human-edited config files; JSON is better for machine-generated data.
Yes. Paste the manifest and switch to Format YAML mode. If the YAML is malformed, you'll see a specific error message with the line and column. Note that the formatter validates YAML syntax, not Kubernetes schema — it won't catch invalid API versions or missing required fields.
No. The YAML Formatter uses the js-yaml library running entirely in your browser. Your configuration data never leaves your machine.
Useful follow-ups when one conversion usually turns into three more.
Format, validate, and minify JSON instantly with a browser-first editor.
Format raw SQL with dialect support for SQL Server, MySQL, PostgreSQL, SQLite, and more.
Convert JSON payloads into C# classes with nested types, arrays, DateTime, and Guid detection.