YAML to JSON Converter

Input YAML

or drop a file anywhere

Output JSON

Your JSON appears here as you type.

Paste data to see token savings

Convert YAML configuration to JSON for JavaScript applications or APIs.

Example: YAML input and real JSON output

The output below was generated by the same conversion code the converter uses, run on this sample when the page was built.

YAML input (207 characters)

service:
  name: checkout-api
  image: registry.example.com/checkout:2.4.1
  replicas: 3
env:
  LOG_LEVEL: info
  DB_POOL_SIZE: 10
ports:
  - 8080
  - 9090
healthcheck:
  path: /healthz
  intervalSeconds: 15

JSON output (295 characters)

{
  "service": {
    "name": "checkout-api",
    "image": "registry.example.com/checkout:2.4.1",
    "replicas": 3
  },
  "env": {
    "LOG_LEVEL": "info",
    "DB_POOL_SIZE": 10
  },
  "ports": [
    8080,
    9090
  ],
  "healthcheck": {
    "path": "/healthz",
    "intervalSeconds": 15
  }
}

JSON output is 43% larger than the YAML input. The same data is 214 characters as minified JSON and 295 as pretty-printed JSON. Sizes are character counts, not tokens: token counts depend on the model's tokenizer (see the tokenizer comparison).

YAML to JSON: what changes

Reading YAML: Comments are dropped and anchors/aliases are expanded into copies. Unquoted values such as 2021 or 1.0 are read as numbers; quote them in the YAML if they must stay strings.
Writing JSON: Output is pretty-printed with your chosen indentation. JSON is the safest target when the data goes into code, an API, or another tool.

About YAML

YAML is a human-friendly data serialization format. It uses indentation instead of brackets, making configuration files more readable.

✓Human readable
✓No punctuation
✓Supports comments
✓Great for config

Full YAML Documentation →

About JSON

JavaScript Object Notation is the most widely used data interchange format. Lightweight, easy to parse, and supported by every programming language.

✓Universal compatibility
✓Easy to parse
✓Great for APIs
✓Native in JavaScript

Full JSON Documentation →

Why Convert YAML to JSON?

Use JSON when you need maximum compatibility with other systems, APIs, or programming languages. It's the de facto standard for web APIs and data exchange.

YAML to JSON: Frequently Asked Questions

How do I convert YAML to JSON?

Paste your YAML into the editor on json2toon.co. The tool detects the input and produces JSON instantly, then you copy the result. Conversion runs entirely in your browser, so nothing is uploaded to a server.

Is the YAML to JSON converter free?

Yes. Converting YAML to JSON on json2toon.co is free with no account, signup, or usage limit. A free public API is also available for automated, programmatic conversion.

Why convert YAML to JSON?

Convert YAML configuration to JSON for JavaScript applications or APIs.

What should I watch out for when converting YAML to JSON?

Output is pretty-printed with your chosen indentation. JSON is the safest target when the data goes into code, an API, or another tool.

Is my data safe when I convert YAML to JSON?

Yes. The YAML to JSON conversion happens client-side in your browser. Your source data stays on your device and is never sent to or stored on a server, which makes it safe for private or sensitive payloads.