JSON to TOML

Click Convert to generate TOML from JSON

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Features

Standard TOML output: strictly follows TOML spec, supporting tables, nested tables, and array of tables syntax
Smart type mapping: automatically handles string escaping, booleans (true/false), and numeric types
Config migration tool: perfect for initializing configs in Rust, Go, Python and other projects
Auto-repair feature: built-in JSON validation and repair ensures input robustness
Local high-speed processing: pure browser local computation, keeping your config files private and secure

FAQ

How are JSON objects and arrays converted to TOML?

The tool follows the official TOML specification: JSON objects become TOML tables or nested tables, and JSON arrays become inline arrays. Notably, arrays of JSON objects are automatically converted to TOML's "array of tables" syntax (the [[section]] format), which is perfect for handling complex configuration structures.

Can the generated TOML be used directly in Rust or Go projects?

Absolutely. The TOML output strictly follows the standard with proper type mapping and escaping. Whether you're setting up Rust's Cargo config, Go's Viper config, or Python's pyproject.toml, you can copy and use it directly, significantly reducing manual config errors.

What if my JSON data has formatting errors?

The tool has a built-in smart JSON repair engine. If your input JSON has syntax errors like missing quotes or commas, it will attempt to auto-fix and notify you. This ensures you can still generate usable TOML configs even with imperfect source data.