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JSON to TOML Converter

Convert JSON to TOML format online. Paste your JSON and instantly get a valid TOML configuration file. Supports nested objects, arrays, and all TOML data types.

How to Use

  1. Step 1: Paste your JSON content into the left editor.
  2. Step 2: The TOML equivalent appears in real-time.
  3. Step 3: Copy or download the TOML output.

Frequently Asked Questions

What JSON structures are not supported in TOML?

TOML does not support null values or arrays of mixed types.

Why convert JSON to TOML?

TOML is more human-readable for configuration files. Some tools like Cargo and Hugo use TOML exclusively.

What should I know when converting JSON to TOML?

TOML does not support null values, mixed-type arrays are invalid, and TOML has native date/time types. Integer keys need special handling. Review output for type mismatches before using in production.

How can I use JSON-to-TOML conversion to migrate config in a Rust project?

The Rust ecosystem (Cargo.toml, Tauri, Bevy) uses TOML extensively. Migration steps: use this tool to convert existing JSON config to TOML; review the output, paying attention to TOML-native date-time format (RFC 3339) and multi-line strings (triple quotes); deserialize in Rust using the serde + toml crate. TOML is better than JSON for hand-written config and supports comments natively.