TOML to JSON Converter Online
Convert TOML configuration files to JSON format instantly in your browser. This free tool runs entirely client-side — your config data never leaves your device.
TOML ↔ JSON/YAML Converter
Convert between TOML, JSON, and YAML formats. Perfect for Cargo.toml, pyproject.toml, and configuration files.
About TOML ↔ JSON/YAML Conversion
- TOML (Tom's Obvious Minimal Language) — simple config format used by Cargo (Rust), pyproject.toml (Python), Hugo, and many CLI tools.
- JSON — strict key-value format for APIs, data exchange, and tooling configs like package.json and tsconfig.json.
- YAML — indentation-based format popular for Kubernetes, Docker Compose, and CI/CD pipelines.
- TOML requires a table (object) at the root — arrays and primitives are not valid top-level values.
- Everything runs in your browser — no data is sent over the network.
What is TOML?
TOML (Tom's Obvious, Minimal Language) is a configuration file format designed to be easy to read and write. It maps cleanly to hash tables and is used by tools like Cargo (Rust), Poetry (Python), Hugo, and many other modern development tools. TOML supports strings, integers, floats, booleans, dates, arrays, and tables with a clear, unambiguous syntax.
Why convert TOML to JSON?
Converting TOML to JSON is useful when you need to process configuration data in languages or tools with better JSON support, integrate TOML-based configs into JSON-consuming APIs, or validate and inspect the parsed structure of a TOML file. JSON's widespread tooling ecosystem makes it a convenient intermediate format for programmatic access.
Frequently Asked Questions
Does TOML to JSON conversion preserve data types?
Yes. TOML types like strings, integers, floats, booleans, and arrays map directly to their JSON equivalents. TOML dates and times are converted to ISO 8601 strings since JSON has no native date type.
Are TOML comments preserved in JSON output?
No. Like YAML comments during conversion, TOML comments are not carried over to JSON because JSON does not support comments. The data itself is fully preserved.