Free JSON to YAML / YAML to JSON Converter

How this tool computes its result

Bidirectional conversion using the `yaml` package for parsing/stringifying and native `JSON.parse`/`JSON.stringify` for the JSON side. In JSON-to-YAML mode, the input is parsed with `JSON.parse` (strict JSON only, no trailing commas or unquoted keys) then serialized with `stringify()` from the `yaml` library. In YAML-to-JSON mode, `parse()` reads the YAML into a JS object which is then rendered with `JSON.stringify(obj, null, 2)`. Any parse failure in either direction is caught and its message shown inline instead of a generic error.

Worked example

JSON-to-YAML mode, input `{"name":"Brand Armor AI","plan":"pro","seats":5}` produces: ``` name: Brand Armor AI plan: pro seats: 5 ``` Switching to YAML-to-JSON and pasting that same YAML back returns `{ "name": "Brand Armor AI", "plan": "pro", "seats": 5 }`, a clean round trip because neither value contains comments or YAML-only features.

When not to use this tool

YAML comments and anchors/aliases do not survive a round trip through JSON — JSON has no comment syntax, so converting YAML with `# notes` to JSON and back permanently drops them. Also, `JSON.parse` is strict, so JS-object-literal shortcuts (unquoted keys, trailing commas, single quotes) are rejected even though some YAML-adjacent tools accept them.

Common mistakes

• - Pasting JS object literal syntax instead of valid JSON (unquoted keys, trailing commas) — `JSON.parse` throws immediately since it does not use a lenient parser.
• - Switching modes without clearing the textarea — leftover YAML text gets fed to `JSON.parse` (or vice versa) and produces a parse error instead of a helpful "wrong mode" message.
• - Expecting inline comments to survive a YAML → JSON → YAML round trip; JSON has no comment syntax so they are silently discarded on the first JSON pass.

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