YAML ↔ JSON Converter

Free YAML to JSON Converter

Quickly convert between YAML (YAML Ain't Markup Language) and JSON (JavaScript Object Notation) — the two most popular data serialization formats. This tool runs entirely in your browser; no data is sent to any server.

YAML vs JSON Comparison

server:
  host: localhost
  port: 8080
  features:
    - auth
    - cache
    - logging

{
  "server": {
    "host": "localhost",
    "port": 8080,
    "features": [
      "auth",
      "cache",
      "logging"
    ]
  }
}

When to Use YAML vs JSON

• YAML — Configuration files (Docker Compose, Kubernetes, GitHub Actions, Ansible), human-readable configs
• JSON — APIs, data interchange, package.json, tsconfig.json, web applications
• YAML advantages — Comments, multiline strings, anchors/aliases, more readable
• JSON advantages — Universally supported, strict parsing, no ambiguity, native in JavaScript

Supported YAML Features

• Nested objects and arrays
• Comments (stripped during conversion)
• Multiline strings (literal block | and folded block >)
• Boolean values (true, false, yes, no)
• Null values (null, ~)
• Numbers (integers, floats, hex, octal)
• Inline arrays and objects