YAML to JSON Converter - Convert YAML to JSON Online

YAML → JSON

About the YAML → JSON playground

YAML → JSON parses human-friendly YAML and outputs the equivalent JSON. Mappings become objects, sequences become arrays, and scalars become strings, numbers, booleans, or null. Because every JSON document is itself valid YAML, the two formats share a common data model, making this handy for feeding config files written in YAML into tools and APIs that expect JSON.

YAML (YAML Ain't Markup Language) is an indentation-based data serialization format prized for readability in configuration and CI pipelines. JSON (JavaScript Object Notation) is a stricter, brace-and-bracket format that's the lingua franca of web APIs. This converter resolves YAML's indentation, anchors, and scalar types into explicit JSON structure, so you can move from authoring convenience to machine-friendly interchange.

HostedYAML → JSON runtime

mainentry file

single fileworkspace

stdinprogram input

How it works

Write

The main file is the entry point for each run.

Give it input

Use the Input panel to pipe standard input to your program when it needs data.

Run

Run sends your code to a fresh hosted runtime and streams the result into the output panel.

Keep or share

Your draft stays in this browser, and Share creates a separate snapshot link.

External resources

yaml.org— Official website

Input (YAML)

name: Ada
active: true
roles:
  - admin
  - user

Output (JSON)

{
  "name": "Ada",
  "active": true,
  "roles": ["admin", "user"]
}

Input (YAML nested)

server:
  host: localhost
  port: 8080

Output (JSON)

{
  "server": {
    "host": "localhost",
    "port": 8080
  }
}

Input (YAML scalars)

count: 42
ratio: 3.14
label: "01234"
note: null

Output (JSON)

{
  "count": 42,
  "ratio": 3.14,
  "label": "01234",
  "note": null
}

Input (YAML list of maps)

users:
  - id: 1
    name: Ada
  - id: 2
    name: Linus

Output (JSON)

{
  "users": [
    { "id": 1, "name": "Ada" },
    { "id": 2, "name": "Linus" }
  ]
}

Input (YAML multiline string)

message: |
  line one
  line two
title: Demo

Output (JSON)

{
  "message": "line one\nline two\n",
  "title": "Demo"
}

Input (YAML flow style)

point: { x: 1, y: 2 }
tags: [red, green, blue]

Output (JSON)

{
  "point": { "x": 1, "y": 2 },
  "tags": ["red", "green", "blue"]
}

Input (YAML anchors & aliases)

defaults: &defaults
  retries: 3
  timeout: 30
prod:
  <<: *defaults
  timeout: 60

Output (JSON)

{
  "defaults": {
    "retries": 3,
    "timeout": 30
  },
  "prod": {
    "retries": 3,
    "timeout": 60
  }
}

yaml

json

Output

JSON output

YAML → JSON Converter

Write

Give it input

Run

Keep or share

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