JSON to YAML Converter

A JSON to YAML converter transforms a JSON document into YAML format. YAML is the preferred configuration language for Kubernetes manifests, Docker Compose files, GitHub Actions workflows, Ansible playbooks, and many CI/CD pipelines. Use this tool when you have structured data or API output in JSON and need to express it in YAML for deployment, configuration, or documentation purposes. Conversion runs locally in your browser, so your data stays private.

1. Paste JSON: Add valid JSON into the input box. The tool validates the JSON before converting.
2. Pick indentation: Choose 2 spaces (most common YAML convention) or 4 spaces for wider readability.
3. Copy YAML: Click the copy button to grab the output for your config file, deployment manifest, or documentation.

• Bridge data and config: APIs return JSON, but many deployment tools require YAML. This tool closes the gap instantly.
• Human-readable output: YAML replaces braces and brackets with indentation, making complex structures easier to read and review in pull requests.
• Precise formatting: The converter handles nested objects, arrays, multiline strings, and special characters correctly, saving you from manual YAML syntax errors.
• Private conversion: All processing happens in your browser. Nothing is uploaded.

Use case 1: Convert API responses to Kubernetes manifests

Pull a service configuration from a REST API in JSON, convert it to YAML, and paste it into your Kubernetes deployment file. This is faster than manually rewriting the structure.

Use case 2: Generate Docker Compose snippets

When prototyping a multi-container setup, start with a JSON object that defines services, ports, and volumes, then convert to YAML for docker-compose.yml.

Use case 3: Create GitHub Actions workflow inputs

Define your workflow triggers, jobs, and steps as JSON during design, then convert to YAML for the final .github/workflows/*.yml file.

Use case 4: Document API payloads in readable format

Technical documentation often includes example payloads. Converting JSON examples to YAML makes them shorter and easier for readers to scan.

The converter parses the JSON input, then serializes it to YAML using standard rules:

• Objects become YAML mappings with key: value pairs, one per line.
• Arrays become block sequences with - item syntax.
• Strings are output unquoted when safe. Strings that contain special YAML characters (:, #, {, }, [, ]) are automatically quoted.
• Numbers and booleans are preserved as their native types (true, false, 42, 3.14).
• Null values are rendered as null in YAML.
• Nested structures use indentation to indicate depth. Each nesting level adds the number of spaces you selected (2 or 4).

The output follows the YAML 1.2 specification, which is compatible with Kubernetes, Docker Compose, GitHub Actions, and all major YAML parsers.

Example 1: Simple object with array

Input (JSON):

{ "name": "api", "enabled": true, "ports": [80, 443] }

Output (YAML, 2-space indent):

name: api
enabled: true
ports:
  - 80
  - 443

Example 2: Nested configuration

Input (JSON):

{
  "server": {
    "host": "0.0.0.0",
    "port": 8080,
    "tls": {
      "enabled": true,
      "cert": "/etc/ssl/cert.pem",
      "key": "/etc/ssl/key.pem"
    }
  },
  "logging": {
    "level": "info",
    "format": "json"
  }
}

Output (YAML):

server:
  host: 0.0.0.0
  port: 8080
  tls:
    enabled: true
    cert: /etc/ssl/cert.pem
    key: /etc/ssl/key.pem
logging:
  level: info
  format: json

JSON parsing failed

If your input uses single quotes, trailing commas, or unquoted keys, it is JavaScript object notation rather than strict JSON. Format and validate the input first with JSON formatter, which will fix common syntax issues.

YAML output contains unexpected quotes

The converter quotes strings that could be misinterpreted by YAML parsers. For example, "yes" and "no" are quoted to prevent YAML 1.1 parsers from treating them as booleans. This is intentional and ensures safe output.

Indentation looks wrong when pasted

Some text editors auto-indent or convert tabs to spaces. Paste into a plain-text editor or use a YAML-aware editor (VS Code with YAML extension) to preserve the formatting.

Large input causes slow performance

Very large JSON files (5 MB+) may cause the browser tab to freeze briefly during parsing. Split large files into smaller sections, convert individually, and recombine.

• Use 2-space indentation for Kubernetes, Docker Compose, and GitHub Actions. This matches the community convention and keeps files compact.
• Format JSON first with JSON formatter to catch syntax errors before converting.
• Validate YAML output with YAML formatter or your target tooling to confirm compatibility.
• Chain conversions: If you start with XML, convert to JSON first with XML to JSON, then convert the JSON to YAML for a two-step migration.
• Keep a JSON copy alongside the YAML for environments that need both formats (e.g., API documentation in JSON, deployment in YAML).

• Validate JSON input with JSON formatter.
• Format and validate YAML output with YAML formatter.
• Convert the other direction with YAML to JSON.
• Start from XML with XML to JSON.

This conversion runs locally in your browser. Your JSON data is not uploaded to any server. All parsing and serialization happens on your device, so you can safely convert configuration files, API credentials, and deployment manifests containing sensitive values.