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TOML to JSON Converter

TOML to JSON lets you format and beautify TOML to JSON quickly in your browser — nothing is uploaded.

Paste TOML to convert it to JSON. The parser handles top-level keys, [tables], [[arrays of tables]] and typed values — strings, numbers, booleans and inline arrays. It covers common TOML; very advanced features may not be supported. Runs in your browser.

About TOML to JSON

This tool converts TOML configuration into JSON. It handles top-level keys, [tables], [[arrays of tables]] and typed values — strings, numbers, booleans and inline arrays. It runs entirely in your browser.

How TOML to JSON works

How to use it

  1. Paste your TOML.
  2. Copy the formatted JSON.

How it works

The parser reads the file line by line, building nested objects from [table] and [[array]] headers and parsing each key = value pair into the right JSON type. Comments are ignored.

Common uses

  • Convert TOML to JSON
  • Read a Cargo or pyproject file as JSON
  • Inspect a config
  • Migrate config formats
  • Use TOML data in JS
  • Debug a TOML file
  • Convert nested tables
  • Learn how TOML maps to JSON

Frequently asked questions

How do I convert TOML to JSON?
Paste TOML and copy the JSON.
Are tables supported?
Yes — [tables] and [[arrays of tables]].
Are types preserved?
Yes — strings, numbers, booleans and arrays.
Is my TOML uploaded?
No — it parses in your browser.
Are comments handled?
Yes — # comments are ignored.
Does it cover all TOML features?
It covers common cases; very advanced syntax may not parse.
Is it free?
Yes — completely free with no sign-up.