YAML-JSON Converter

About YAML-JSON Converter

YAML-JSON Converter is a free online tool for converting between YAML (YAML Ain't Markup Language) and JSON (JavaScript Object Notation) formats. Upload files or paste data, customize formatting options, and download converted files—all processed locally in your browser for complete privacy.

What is YAML and why use it?

YAML (YAML Ain't Markup Language) is a human-friendly data serialization format. It's popular for:

- Configuration files (Docker, Kubernetes, CI/CD)
- Data exchange between programming languages
- Application settings and environment configs
- API definitions (OpenAPI/Swagger)

YAML is more readable than JSON for humans but less common for web APIs. Converting between formats lets you use the best tool for each job.

When should I use JSON vs YAML?

Use JSON when:
- Building web APIs and REST services
- Working with JavaScript applications
- Need strict syntax validation
- Require maximum compatibility

Use YAML when:
- Writing configuration files
- Need human-readable documentation
- Want to include comments
- Prefer cleaner, indentation-based syntax

This tool lets you convert between both formats as needed.

Does my data leave my device?

No. All YAML-JSON conversion happens entirely in your browser using JavaScript. Your data never leaves your machine, ensuring complete privacy for sensitive configuration files, API definitions, or any confidential data.

What formatting options are available?

For JSON output:
- Minify: Remove whitespace for smallest file size
- Indent: Choose 2 or 4 spaces for readability

For YAML output:
- Indent size: 2 or 4 spaces
- Inline format: Use flow style (compact arrays/objects)
- No array indent: Remove extra indentation from arrays

These options let you match your project's coding standards.

Can I convert configuration files?

Yes! This tool is perfect for converting configuration files between formats:
- Docker Compose YAML ↔ JSON
- Kubernetes manifests ↔ JSON
- CI/CD configs (GitHub Actions, GitLab CI)
- OpenAPI/Swagger specifications
- Application settings files

Simply paste or upload your config file and convert to your preferred format.

What if I have invalid YAML or JSON?

The tool will detect syntax errors and show an error message with details about what went wrong. Common issues include:

- YAML: Incorrect indentation, missing colons, invalid characters
- JSON: Missing quotes, trailing commas, unclosed brackets

Use the error messages to identify and fix syntax problems in your data.