How do I convert YAML to JSON?

Paste your YAML into the converter on this page and pick JSON 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: "yaml", to: "json", data }.

Is the YAML to JSON converter free?

Yes. The on-page YAML-to-JSON 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 YAML to JSON

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

Input (YAML)

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

Output (JSON)

Convert this via the API (curl)

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

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

YAML vs JSON

YAML

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

JSON

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

How to convert YAML to JSON

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

Example

YAML in

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

JSON out

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

Convert YAML to JSON 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":"yaml","to":"json","data":"...your YAML as a string..."}'

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

FAQ

Does converting YAML to JSON 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.

Other conversions