What is TOML / JSON Converter?
TOML / JSON Converter validates TOML files and converts between TOML and JSON formats. TOML is a configuration file format used by Rust (Cargo.toml), Python (pyproject.toml), Hugo, Deno, and many other tools. When you need to inspect TOML structures or transform configuration data, this tool handles it instantly on-device.
The tool supports the full TOML specification including nested tables, arrays of tables, inline tables, multi-line strings, integers, floats, booleans, and datetime values. Validation errors are reported with line numbers so you can quickly find and fix syntax problems.
How to Use TOML / JSON Converter
Paste your TOML content and the tool validates it immediately, showing a green indicator for valid TOML or error details with line numbers for invalid input. Select TOML to JSON to see the equivalent JSON representation.
For the reverse direction, paste JSON and convert to TOML. The JSON to TOML conversion produces clean, readable TOML with proper table headers and key-value formatting. Copy the result to use in your configuration files.
Common Use Cases
- Cargo.toml inspection: Convert Rust project configuration to JSON to inspect dependency versions and feature flags in a familiar format.
- pyproject.toml editing: Validate Python project configuration files and convert between TOML and JSON when tooling requires different formats.
- Configuration migration: Transform TOML configuration to JSON (or vice versa) when migrating between tools that use different config formats.
- CI/CD debugging: Validate TOML configuration files for CI/CD pipelines and inspect their structure as JSON.
- Documentation: Convert TOML examples to JSON for documentation that needs to show both formats side by side.