JSON to YAML — Complete Conversion Guide with Examples

JSON and YAML — Two Ways to Store the Same Data

JSON and YAML both store structured data but with different syntax. YAML is designed to be read and written by humans. JSON is designed to be read and written by machines.

The same data in both formats:

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

server:
  host: localhost
  port: 8080
  debug: true

YAML has no curly braces, no square brackets, no commas, and no quotes around simple strings. Indentation defines the structure.

When to Use Each

Use JSON for API communication, database storage, and JavaScript projects. JSON is supported natively in every programming language and is the universal format for REST APIs.

Use YAML for configuration files that humans edit frequently. Docker Compose, Kubernetes, GitHub Actions, Ansible, and most CI/CD tools use YAML for this reason.

Bidirectional Conversion in JSONKit

JSONKit supports both directions from the same page at /json-to-yaml. Use the toggle in the page header to switch between JSON to YAML and YAML to JSON mode.

The Swap button flips the current output back into the input and switches mode automatically, so you can round-trip your data without re-pasting.

YAML Syntax Rules

Indentation defines structure — use spaces not tabs. Two spaces per level is the most common convention. Strings do not need quotes unless they contain special characters. Boolean values are true or false in lowercase. Null is represented as null or tilde.

Arrays use a dash and space before each item:

tags:
  - json
  - yaml
  - api

Common Conversion Issues

Multi-line strings — YAML block scalars are preserved as strings in JSON output but formatting may differ. Comments — YAML supports comments with hash but JSON does not, so all comments are stripped when converting YAML to JSON.