YAML ↔ JSON Converter

Convert YAML to JSON and JSON to YAML as you type, with 2 or 4-space indentation, key sorting and line-numbered parse errors.

Indent:

Sort keys

YAML input48 lines

JSON output64 lines

{
  "name": "Acme API",
  "version": "2.0.0",
  "active": true,
  "rating": 4.85,
  "features": [
    "JSON Formatter",
    "Base64 Tool",
    "YAML Converter",
    "Regex Tester"
  ],
  "server": {
    "host": "localhost",
    "port": 3000,
    "ssl": true,
    "cors": {
      "origins": [
        "http://localhost",
        "https://example.com"
      ],
      "methods": [
        "GET",
        "POST",
        "PUT"
      ]
    }
  },
  "database": {
    "driver": "postgresql",
    "connection": {
      "host": "db.example.com",
      "port": 5432,
      "name": "acme_db",
      "pool_size": 10
    },
    "replicas": [
      {
        "host": "replica-1.example.com",
        "port": 5432,
        "read_only": true
      },
      {
        "host": "replica-2.example.com",
        "port": 5432,
        "read_only": true
      }
    ]
  },
  "metadata": {
    "created": "2026-02-11T00:00:00Z",
    "tags": [
      "developer-tools",
      "react",
      "astro"
    ],
    "stats": {
      "users": 1420,
      "rating": 4.8
    },
    "description": "A comprehensive developer toolkit\nwith multiple utilities for daily use.\n",
    "nullable_field": null,
    "enabled": "yes"
  }
}

Valid JSON output2-space indent

Supported YAML features

Scalars

Strings (quoted and unquoted), numbers, booleans (true/false), null, and special floats. YAML 1.2 core reads yes/no as strings.

Structures

Nested objects via indentation, arrays with dash prefix, and mixed nesting at any depth.

Flow style

Inline arrays [a, b, c] and inline objects {a: 1, b: 2} with proper nesting support.

Block scalars

Literal (|) and folded (>) multi-line strings with strip, clip, and keep chomp modes.

Related tools: YAML/JSON5 config validator • TOML editor

Updated October 2, 2026. Provided as is. Check the output before you rely on it in production.

How to use YAML ↔ JSON Converter

1

Choose a direction

Pick YAML → JSON or JSON → YAML, then paste your input. Swap flips the direction and moves the output into the input.
2

Set output options

Choose the indent width and optionally sort keys alphabetically.
3

Check for errors

Invalid input reports the parse error, such as bad indentation or an unclosed bracket, so you can fix it before converting.
4

Copy the result

Copy or download the converted output for your config files, code or documentation.

Questions and answers

What is YAML to JSON Converter?

YAML and JSON hold the same kinds of data: YAML uses indentation and is common in config files, JSON uses braces and is what most APIs exchange. This converter goes either way as you type, with 2 or 4-space indentation, optional key sorting for YAML output, and parse errors with line numbers.

Does YAML to JSON Converter store or send my data?

No. All processing happens entirely in your browser. Your configuration data never leaves your device — nothing is sent to any server.

Why would I convert between YAML and JSON?

YAML is common in Kubernetes, Docker Compose, and CI/CD configs, while JSON is used in APIs and package files. Converting between them lets you reuse config data across different tools and platforms.

Use it as an API

YAML ↔ JSON Converter is also callable as a free HTTP JSON API at https://aidevhub.io/api/yaml-json/ — GET with query parameters or POST with a JSON body, no authentication, CORS enabled, fair use (abusive traffic is throttled at the edge; there is no per-request quota header). Responses return { ok, tool, result, meta }.

curl -s -X POST https://aidevhub.io/api/yaml-json/ \
  -H "Content-Type: application/json" \
  -d '{"input":"name: test\nreplicas: 2","direction":"yaml_to_json"}'

Machine-readable contract: /api/tool/yaml-json.json All API endpoints: /agents/ LLM site index: /llms.txt

For AI agents: how to call this tool

Machine-readable contract, endpoints and examples. Humans can ignore this section.

Best Path For Builders

Dedicated API endpoint

Deterministic outputs, machine-safe contracts, and production-ready examples.

Dedicated API

https://aidevhub.io/api/yaml-json/

OpenAPI: https://aidevhub.io/api/openapi.yaml

GET /api/yaml-json/ GET yaml-json

POST /api/yaml-json/ POST yaml-json

YAML ↔ JSON Converter