How do I convert JSON to YAML?

Paste your JSON into the converter on this page and pick YAML as the output. Conversion happens instantly in your browser — nothing is uploaded. You can also call the free API: POST /api/v1/convert with { from: "json", to: "yaml", data }.

Is the JSON to YAML converter free?

Yes. The on-page JSON-to-YAML converter is free and runs locally in your browser. The developer API is also free during beta, with a per-call paid tier for bulk and large payloads.

Convert JSON to YAML

Paste your JavaScript Object Notation (JSON) and convert it to YAML Ain't Markup Language (YAML) in one click. Runs entirely in your browser — no upload, no signup.

Input (JSON)

[
  { "id": 1, "name": "Ada Lovelace", "role": "Engineer", "active": true },
  { "id": 2, "name": "Alan Turing", "role": "Researcher", "active": false }
]

Output (YAML)

Convert this via the API (curl)

curl -X POST "https://data.wrapper-agency.com/api/v1/convert" \
  -H "Content-Type: application/json" \
  -d '{"from":"json","to":"yaml","data":"[\n  { \"id\": 1, \"name\": \"Ada Lovelace\", \"role\": \"Engineer\", \"active\": true },\n  { \"id\": 2, \"name\": \"Alan Turing\", \"role\": \"Researcher\", \"active\": false }\n]"}'

Free conversion API — no key during beta. POST { from, to, data }, get back the converted string. All conversion runs server-side; nothing is stored.

JSON vs YAML

JSON

A lightweight, human-readable data-interchange format. The default for web APIs and config.

YAML

An indentation-based, comment-friendly format used heavily for config (Kubernetes, CI, Docker Compose).

How to convert JSON to YAML

FormatForge parses your JSON into an in-memory data structure, then serializes it as YAML. Numbers, booleans, and null values are preserved, and nested structures are mapped to YAML's native shape.

Example

JSON in

[
  { "id": 1, "name": "Ada Lovelace", "role": "Engineer", "active": true },
  { "id": 2, "name": "Alan Turing", "role": "Researcher", "active": false }
]

YAML out

- id: 1
  name: Ada Lovelace
  role: Engineer
  active: true
- id: 2
  name: Alan Turing
  role: Researcher
  active: false

Convert JSON to YAML in code

Send the conversion to the free API and get the result back as a string:

curl -X POST "https://data.wrapper-agency.com/api/v1/convert" \
  -H "Content-Type: application/json" \
  -d '{"from":"json","to":"yaml","data":"...your JSON as a string..."}'

Full reference: the conversion API. For bulk or very large payloads, see the paid bulk endpoint.

FAQ

Does converting JSON to YAML change my data?: No — the conversion is structural. Your values are preserved; only the serialization format changes.
Is my data uploaded anywhere?: The on-page converter runs locally in your browser. The API processes your payload server-side and stores nothing.

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