toolkit

YAML ↔ JSON Converter

Runs in browser

Convert between YAML and JSON formats

Drag and drop a file here, or

Max 50MB (.json, .yaml, .yml)

How to Use

Paste YAML/JSON or upload a file. Click "JSON → YAML" or "YAML → JSON".

You will see:

  • Converted Output
  • Syntax Validation
  • Live Conversion (optional)
  • One-click Copy
Output

No output yet

Convert JSON to YAML or vice versa

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About YAML and JSON Conversion

YAML (YAML Ain't Markup Language) and JSON (JavaScript Object Notation) are both data serialization formats. This tool converts between them instantly, making it easy to work with configuration files, API payloads, and data interchange.

YAML vs JSON Comparison

Feature YAML JSON
ReadabilityMore human-readableCompact but verbose
CommentsSupported (#)Not supported
SyntaxIndentation-basedBrackets and braces
QuotesOptional for stringsRequired for strings
ParsingSlower, complexFast, native support
Use caseConfiguration filesAPIs, data exchange

Same Data, Different Formats

YAML

# User configuration
name: John Doe
age: 30
active: true
skills:
  - JavaScript
  - Python
  - Go
address:
  city: New York
  zip: "10001"

JSON

{
  "name": "John Doe",
  "age": 30,
  "active": true,
  "skills": [
    "JavaScript",
    "Python",
    "Go"
  ],
  "address": {
    "city": "New York",
    "zip": "10001"
  }
}

When to Use Each Format

Use YAML for:

  • Kubernetes manifests and Helm charts
  • Docker Compose files
  • CI/CD pipelines (GitHub Actions, GitLab CI, CircleCI)
  • Ansible playbooks
  • Application configuration files

Use JSON for:

  • REST and GraphQL API requests/responses
  • package.json, tsconfig.json, and similar files
  • MongoDB documents
  • Data interchange between services
  • Browser localStorage/sessionStorage

YAML Syntax Essentials

  • Indentation: Use spaces (not tabs), typically 2 spaces per level
  • Strings: Quotes optional unless containing special characters
  • Lists: Use - prefix for each item
  • Multi-line strings: Use | (literal) or > (folded)
  • Comments: Start with #
  • Anchors: Use &name and *name for reuse

Common Conversion Issues

  • Comments lost: YAML comments cannot be preserved in JSON (JSON doesn't support comments)
  • Indentation errors: Inconsistent spacing in YAML causes parsing failures
  • Type coercion: YAML auto-interprets values (e.g., yes → true), which may not be desired
  • Anchors/aliases: YAML anchors are expanded in JSON output

💡 Pro Tips

  • Always use spaces (not tabs) for YAML indentation
  • Quote strings that look like numbers or booleans in YAML: "yes", "1.0"
  • Use a YAML linter in your CI/CD pipeline
  • Validate Kubernetes YAML before applying to clusters
  • This tool processes everything locally in your browser

Further Reading