YAML Parser

This tool supports YAML 1.2 specification through the js-yaml library, which covers the vast majority of YAML documents in use today including Kubernetes configs, Docker Compose files, and CI/CD pipelines.

Yes. Simply switch to JSON to YAML mode using the toggle, paste your JSON content, and the tool will convert it to properly indented YAML format.

Absolutely. All parsing and conversion happens entirely in your browser using client-side JavaScript. Your YAML and JSON data is never sent to any server.

YAML 1.2 was explicitly designed as a strict superset of JSON - every valid JSON document is valid YAML, and JSON is the recommended interoperability subset of YAML. YAML adds comments, anchors, block scalars, and type coercion on top. That relationship makes YAML-to-JSON conversion lossless, which is exactly what this tool performs.

&anchor names a node, *alias reuses it, and <<: merges a mapping into the current one. A common pattern: define defaults: &d with retries and timeout, then write prod: { <<: *d, retries: 10 } to inherit timeout while overriding retries. This deduplication originated in YAML 1.1 and is still supported by virtually all tooling.

YAML 1.1 coerces the bare string NO to boolean false - the same for no, on, off, yes, y, and n. A country list [NO, SE, DK] silently becomes [false, SE, DK]. YAML 1.2 tightened this (only true and false are booleans), but many parsers kept 1.1 behavior, so the fix is quoting: "NO". This parser shows you exactly how each scalar resolved.

It dominates operations and CI configuration: Kubernetes manifests, Docker Compose, GitHub Actions, GitLab CI, Ansible playbooks, and OpenAPI documents are all YAML. The .yml and .yaml extensions are interchangeable, .yaml being the canonical one from the specification.

Use | for a literal block (line breaks preserved as-is, great for code) and > for a folded block (line breaks become spaces, paragraphs collapse). Both clip a single trailing newline by default; chomping indicators adjust it: |- strips all trailing newlines, + keeps every one. The indentation under the key defines the block's boundary.