JSON ↔ YAML Converter

YAML (YAML Ain't Markup Language) is a data format that represents the same structures as JSON — objects, arrays, strings, numbers, booleans, null — but uses indentation and line breaks instead of braces and commas. It's the format of choice for config files (Docker Compose, Kubernetes, GitHub Actions) because it's easier for humans to read and write by hand, and it supports comments, which JSON doesn't.

Every JSON document can be converted to YAML without losing information, since JSON is effectively a subset of YAML. The reverse isn't always lossless — YAML features like anchors, multi-document files, and custom tags don't have a JSON equivalent — but for the plain key-value structures most configs and API payloads use, the round trip is clean. This tool converts in both directions entirely in your browser.

• •YAML is indentation-sensitive — use spaces consistently (never tabs) or the parser will reject the document.
• •Quote string values that could be misread as another type, like "yes", "no", "on", "null", or version strings like "1.20" — YAML's implicit typing can silently turn them into booleans or numbers.
• •Prefer YAML for anything a human edits directly (configs, CI pipelines) and JSON for anything machine-to-machine (API payloads) — each format plays to its strength.
• •Watch out for YAML's block vs. flow styles: `key: [a, b]` and a multi-line dashed list represent the same array, so don't assume one when reading unfamiliar YAML.