JSON and TOML are both popular formats for configuration and data exchange. While JSON is ubiquitous in web APIs, TOML is often preferred for human-readable configuration files. Our JSON to TOML converter allows you to switch between these formats effortlessly while maintaining data integrity.
What is TOML?
TOML (Tom's Obvious, Minimal Language) is a configuration file format that's easy to read due to obvious semantics. It is designed to map unambiguously to a hash table and is used in many modern tools like Rust's Cargo and various Go-based applications.
Why Use Our JSON to TOML Converter?
- Lossless conversion of strings, numbers, booleans, and dates
- Automatic formatting of TOML tables and arrays
- Secure local conversion: your data stays in the browser
- Handles complex nested JSON structures
- No installation or account required
- Instant real-time preview of results
How to Convert JSON to TOML
Paste JSON Content
Copy your JSON object and paste it into the input area.
Choose Conversion
Verify the direction is set to "JSON to TOML".
Review Result
The tool instantly generates a clean TOML structure with keys and tables.
Export
Download the result as a .toml file or copy to clipboard.
Key Features
Table Organization
Automatically organizes objects into [table] and [[array.of.tables]] sections.
Data Type Mapping
Preserves integers, floats, booleans, and even datetime strings correctly.
Clean Indentation
Generates prettified output following standard TOML best practices.
Error Reporting
Provides clear feedback on malformed JSON or TOML syntax.
Privacy Guaranteed
Runs entirely on the client side without any server-side storage.
Best Practices
- Use strings for extremely large numbers to avoid precision loss in JSON
- Ensure your top-level JSON is an object, as TOML roots are tables
- Keep keys descriptive as they become configuration names
- Check for date strings to ensure they are interpreted as TOML datetimes
Common Use Cases
Configuration Migration
Convert app settings from JSON to TOML for modern developer tools.
DevOps Tooling
Generate config files for Rust, Go, or Python projects from JSON data.
API Prototyping
Quickly visualize JSON responses as human-readable TOML files.
Frequently Asked Questions
Does it support nested objects?
Yes! Nested objects are converted into TOML tables (e.g., [parent.child]).
How are arrays handled?
Arrays of values become standard TOML arrays, while arrays of objects become arrays of tables.
Is my data secure?
Yes, no data is sent to our servers. All processing is done in your browser.
Can I convert back to JSON?
Absolutely. The tool is fully bidirectional.
Ready to Get Started?
100% browser-based. Your data never leaves your device.
Open JSON to TOML Converter