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🔒 100% Private · No Uploads

JSON ↔ YAML ↔ TOML Converter

Convert between data formats instantly. All processing is done in your browser.

JSON
← Enter data above
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Why Use This Converter?

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All 6 Convert Paths

JSON→YAML, JSON→TOML, YAML→JSON, YAML→TOML, TOML→JSON, TOML→YAML — every combination supported.

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100% Private

All processing is done in your browser. No data is ever sent to any server. Your configs stay on your machine.

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Real-Time Validation

Syntax errors are highlighted instantly as you type. No more guessing why your output looks wrong.

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File Upload & Download

Open .json, .yaml, .yml, or .toml files directly. Download results with the correct extension.

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Auto-Detect

Not sure what format your input is? The tool auto-detects JSON, TOML, then YAML. Just paste and convert.

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Developer Friendly

Keyboard shortcut (Ctrl+Enter), monospace editor, minify/beautify toggle, and clipboard support.

Frequently Asked Questions

Is this really free and private?▼
Yes, completely free and 100% private. All conversion and validation happens in your browser using JavaScript libraries. Your data never touches any server, and nothing is logged or tracked.
What's the difference between JSON, YAML, and TOML?▼
JSON is the most universal data format, used everywhere from APIs to config files. YAML is more readable with indentation instead of brackets, popular for configs (Docker, Kubernetes, CI/CD). TOML aims to be minimal and unambiguous, used by Rust's Cargo and Python's pyproject.toml.
Why won't my YAML convert to JSON?▼
This usually happens because YAML has features JSON can't represent — like anchors/aliases, complex keys, or certain types. Check for syntax errors displayed in red below the input editor.
Is there a file size limit?▼
No hard limit, but very large files (10MB+) may slow down your browser. For most configs and data files, performance is instant.
Can I convert between JSON and other formats?▼
Yes — this tool supports all six bidirectional paths: JSON↔YAML, JSON↔TOML, and YAML↔TOML. Just select your input format on the left and desired output format on the right.
Does this work offline?▼
After the first page load, the JavaScript libraries are cached by your browser. As long as the page is open, it works offline — perfect for sensitive configs.
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