TOML ⇄ JSON Converter

Convert between TOML and JSON locally in your browser.

🌐 Uses API

Also try:Historical Age Calculator·Pet Age Calculator·Relationship Timeline

Tips for TOML

Use [table] and [[array_of_tables]] for structure. Keys are case-sensitive.
Types like dates, times, and arrays are preserved; strings should be quoted.
Trailing commas are not allowed in arrays/tables. Comments begin with #.
On error, check quotes and ensure numbers aren’t accidentally parsed as strings (and vice versa).
Tip: Use Reset to clear one side, or Reset all to clear both panels; use Pretty JSON to format JSON output.
Tip: Press Ctrl/Cmd + Enter in a panel to convert that side instantly.

TOML

Pretty JSON

JSON

Frequently asked questions

Is my data uploaded?

No. Everything runs locally in your browser.

What is supported?

Standard TOML 1.0 features parsed/stringified using iarna-toml.

Can I copy or download?

Yes. Copy to clipboard or download as .json or .toml.

Related tools

Privacy

Most processing happens locally in your browser for speed & privacy. Network calls occur only for live rates or updates.

Premium

Premium feature

Historical analysis & trends

Track your past calculations and visualize patterns.

Calculation presets

Save, load, and manage your favorite calculation setups.

Import

No presets saved yet.

Scenario planning

Compare multiple inputs side-by-side.

Batch processing

Upload a CSV to compute results in bulk.

Custom formulas

Create and reuse your own rules.

External data

Connect Google Sheets or an API as inputs.

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