Web Tools
JSON to TOML Converter
Convert between JSON and TOML formats. Supports nested tables, arrays of tables, inline tables, and proper TOML formatting. Bidirectional conversion with error highlighting. Runs entirely in your browser — your data never leaves your machine.
json toml converter config formatter serialization
Published May 30, 2026
All interactive tools run entirely in your browser. Your data never leaves your device.
How It Works
Paste JSON or TOML content and convert between the two formats. The converter handles nested objects as TOML tables, arrays of objects as TOML arrays of tables, and inline tables for compact notation.
Features
- Bidirectional: convert JSON → TOML and TOML → JSON
- Nested tables: JSON objects become
[table]headers - Arrays of tables: JSON arrays of objects become
[[array]]entries - Inline tables: compact TOML objects like
{ key = "value" } - Inline arrays: simple arrays rendered as
["a", "b", "c"] - Comments: TOML comments (
#) are properly skipped during parsing - Dotted keys: supports
server.host = "localhost"notation - Type preservation: booleans, numbers, strings preserved correctly
- 5 examples: simple config, nested tables, array of tables, package config, mixed types
- Private: runs entirely in the browser — no data transmitted
Use Cases
- Converting JSON configs to TOML (Rust’s Cargo.toml, Python’s pyproject.toml)
- Converting TOML configs to JSON for programmatic use
- Migrating between configuration formats
- Understanding TOML structure by converting from familiar JSON
- Validating TOML syntax by round-tripping through JSON