How is TOML different from YAML?

TOML uses explicit syntax (no significant whitespace), making it less error-prone than YAML for config files.

Can I convert TOML to JSON?

Yes — toggle "Convert to JSON" to output the parsed structure as JSON.

Does it support TOML 1.0?

Yes, full TOML 1.0 spec support including dates, arrays of tables, and inline tables.

Is my TOML uploaded anywhere?

No. Parsing happens entirely in your browser.

TOML Formatter & Validator — Format, validate, and convert TOML configuration files to JSON.

How to use TOML Formatter & Validator

Paste your input on the left, choose the options you want, and the output appears instantly on the right. Everything runs in your browser — none of your data is sent to a server.

Paste or type your input in the INPUT panel
The output regenerates automatically as you type
Use Copy to put the result in your clipboard
Click Sample to load a working example

What is TOML Formatter & Validator?

TOML (Tom's Obvious, Minimal Language) is a config-file format popular with Rust (Cargo.toml), Python (pyproject.toml), and Hugo. This tool validates TOML syntax and pretty-prints or converts to JSON. All processing in your browser. This tool is part of santekno's developer toolbox — a curated collection of utilities built for engineers who care about speed, privacy, and simplicity.

Common use cases

Debugging API payloads and integration issues
Inspecting tokens, hashes, or encoded strings during development
Generating fixtures and sample data for tests
Sharing readable output with teammates in code reviews

FAQ

TOML is commonly used in Rust (Cargo.toml), Python (pyproject.toml), Hugo (config.toml), and various other modern tools.