TOML Output
TOML output will appear here
Paste JSON on the left to generate TOML. Or load sample data to see a demo.
Try JSON to TOML with sample input
JSON to TOML
Convert JSON to TOML for configs and tooling
How to convert JSON to TOML
Paste JSON on the left and copy or download TOML output on the right.
1
Paste JSON input
Paste your JSON into the editor. If you want a quick demo, click “Sample”.
Supports nested JSON - Objects and arrays are handled correctly.
Instant validation - Invalid JSON shows an error message.
JSON Input Example
{
"app": {
"name": "demo-web",
"port": 3000,
"features": { "beta": true }
}
}2
Review TOML output
The converted TOML will appear on the right panel as you type.
Config-friendly - Great for tooling and configuration files.
Readable formatting - Clean TOML output for humans.
TOML Output Example
[app]
name = "demo-web"
port = 3_000
[app.features]
beta = true3
Copy or download TOML
Use “Copy” to copy TOML to your clipboard, or “Download” to save it as a .toml file.
One-click copy - Copy TOML output instantly.
Download .toml - Save TOML output as a file for sharing.
Copy or download TOML
2 Actions
Download
Download TOML as output.toml
Copy
Copy TOML output to clipboard
Tip: TOML is popular for config (Rust, tools, and CI pipelines).
JSON to TOML FAQs
Common questions about converting JSON to TOML
A JSON to TOML converter is a tool that transforms JSON (JavaScript Object Notation) data into TOML (Tom's Obvious Minimal Language) format. TOML is designed for configuration files and is widely used in Rust projects (Cargo.toml), Python packaging (pyproject.toml), and other modern development tools. Our JSON to TOML converter handles this transformation instantly in your browser, making it perfect for migrating API responses, configuration data, or any JSON structure into TOML format for your development workflow.
Yes. The JSON to TOML converter fully supports complex data structures including deeply nested objects and arrays. Nested JSON objects are automatically converted to TOML tables (using dotted keys or table headers), and JSON arrays are transformed into TOML array syntax. For example, a JSON object like {"database": {"server": "localhost", "ports": [8001, 8002]}} becomes a proper TOML table structure with array notation. This makes the converter ideal for converting complex configuration hierarchies used in microservices, infrastructure-as-code, or application settings.
No. All JSON to TOML conversion happens entirely in your browser using client-side JavaScript. Your data never leaves your device or gets uploaded to any server. This privacy-first approach ensures complete data security and GDPR compliance, making it safe to convert sensitive configurations like database credentials, API keys, service endpoints, or internal infrastructure settings. The converter works offline once loaded, and you can use it with complete confidence for any proprietary or confidential JSON data.
TOML offers several advantages over JSON for configuration files: it's more human-readable with minimal syntax, supports comments (JSON doesn't), allows multi-line strings naturally, and has clearer table structures for nested data. TOML is the preferred format for Rust (Cargo.toml), Python packaging (pyproject.toml), Hugo static sites, and many modern DevOps tools. Our JSON to TOML converter makes it easy to migrate existing JSON configs to TOML when adopting these technologies, or when you need more maintainable configuration files for version control and team collaboration.
Absolutely! The JSON to TOML converter generates TOML v1.0 compliant output that works seamlessly with Cargo (Rust's package manager), Python's pyproject.toml for PEP 518 builds, and any other TOML parser. The conversion preserves data types correctly—JSON strings become TOML strings, numbers remain numbers, booleans are properly formatted, and arrays are converted with correct TOML array syntax. This makes it perfect for converting JSON API responses or data exports into configuration files for Rust crates, Python packages, or application settings.
The JSON to TOML converter handles type mapping intelligently: JSON strings become TOML strings (with proper escaping for special characters), JSON numbers are preserved as TOML integers or floats, JSON booleans convert to TOML true/false, JSON arrays become TOML arrays, and JSON objects transform into TOML tables. JSON null values are handled gracefully, and the converter maintains the hierarchical structure of your data. This ensures that when you convert JSON to TOML, the semantic meaning and data integrity are fully preserved for use in configuration files and application settings.
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