JSON ↔ YAML Converter

Convert JSON to YAML and YAML to JSON instantly in your browser. Great for config files (Kubernetes, Docker Compose, CI/CD pipelines) and for turning API payloads into readable YAML. ToolMill runs client-side for privacy, supports pretty output, and can work offline when installed as a PWA.

Data

Try it

Examples

Simple JSON object to YAML

Input

{"service":"api","replicas":3,"ports":[80,443],"env":{"NODE_ENV":"production","DEBUG":false}}

Output

service: api
replicas: 3
ports:
  - 80
  - 443
env:
  NODE_ENV: production
  DEBUG: false

YAML object to formatted JSON

Input

service: api
replicas: 3
ports:
  - 80
  - 443
env:
  NODE_ENV: production
  DEBUG: false

Output

{
  "service": "api",
  "replicas": 3,
  "ports": [
    80,
    443
  ],
  "env": {
    "NODE_ENV": "production",
    "DEBUG": false
  }
}

Related tools

JSON ↔ CSV Converter

Convert JSON to CSV or CSV to JSON instantly in your browser. Useful for spreadsheets, exports, analytics, and quick data cleanup. Supports headers, quoting, and common CSV edge cases like commas inside fields. Great for preparing imports/exports for Google Sheets, Excel, BI tools, and APIs. Runs client-side for privacy and works offline after installing ToolMill as a PWA.

Data

JSON Pretty Print, Minify, and Validate

Format JSON for readability, minify it for compact storage, and validate it before using it in APIs, config files, frontend apps, or test fixtures. This tool is useful when debugging payloads, comparing responses, cleaning copied JSON, or shrinking data for transport and logging. ToolMill processes everything in your browser, making it a fast privacy-friendly option for working with sensitive JSON.

Data

JSON to CSV Converter

Convert JSON into CSV format directly in your browser for spreadsheet imports, reporting exports, analytics workflows, and quick data cleanup. This tool is useful when you need to flatten structured JSON into rows and columns for Excel, Google Sheets, BI tools, or CSV-based systems. ToolMill runs locally for privacy, handles common export scenarios quickly, and works offline after installation.

Data

JSON Validator

Validate JSON and get precise, line-by-line error messages. Use it to catch subtle issues like trailing commas, comments, unescaped characters, and malformed numbers before shipping configs or API payloads. Runs entirely in your browser for privacy and can work offline when installed as a PWA.

Data