All Tools
Categories
XML Tools 64 Email Marketing Tools 55 Import-Export Tools 50 JSON Tools 36 Text Tools 12 Shipping Freight Tools 5 Calculator 4 Marketing Tools 3
About Contact Privacy

JSON to TOML

Convert a JSON config to TOML in one click: [table] headers, [[array of tables]], inline arrays and strings with proper quoting. Download ready. All client-side.

JSON Input
Waiting for input
TOML Output
Nested objects become [table] headers, arrays of objects become [[array-of-tables]] sections, and scalar arrays become inline arrays. TOML has no null — null values are written as "null".

About JSON to TOML

TOML exists to be read by humans: explicit table headers, plain key = value lines, no nesting punctuation. The ecosystem — Cargo, poetry, pip, Go tooling — loves it, but most of the world still hands you JSON. Translating one into the other by hand means tracking table paths and array-of-tables headers yourself.

Convert JSON to TOML maps a JSON config onto idiomatic TOML: nested objects become [table] sections, arrays of objects become [[array-of-tables]], scalars become inline values, and strings are quoted and escaped correctly. One click, fully client-side.

Features

  • Idiomatic tables: Nested objects become [path.to.table] headers.
  • Array of tables: Arrays of objects become repeated [[path]] sections.
  • Inline arrays: Scalar arrays become compact [ "a", "b" ] values.
  • Proper string quoting: TOML basic strings with \n, \t, \\ and \" escapes.
  • Typed values: Numbers, booleans and mixed arrays survive as TOML literals.
  • Blank-line sections: Output is grouped with blank lines between tables for readability.
  • Copy and download: Export the result as a .toml file instantly.
  • Private: All processing happens in your browser; nothing is uploaded.

How to Use

  1. Paste your JSON config into the input pane.
  2. Review the live TOML — table headers and arrays are applied automatically.
  3. Copy or download the .toml file.

Examples

Example 1 — Rust tooling. A developer converts a JSON build config into a Cargo-adjacent .toml file, with nested objects mapping cleanly onto table headers.

Example 2 — Python packaging. A maintainer migrates setup metadata from JSON to a pyproject.toml style layout, reusing the array-of-tables output for entry points and dependencies.

Example 3 — Config review. An architect converts a JSON config to TOML for a readability review — table headers make the structure visible at a glance in diffs.

Example 4 — Round-trip editing. A developer converts JSON to TOML, edits the friendlier format by hand, and converts back with the companion tool.

Benefits

  • Human-readable output: Table headers replace JSON nesting noise.
  • Standards-correct: Basic strings, tables and arrays of tables follow TOML v1.0.
  • Full structure: Nesting, arrays and types survive conversion.
  • Zero data movement: The document is converted locally and never uploaded.
  • Instant results: Live output updates with every keystroke.

Frequently Asked Questions

How does JSON become TOML?
Root-level scalars become key = value lines. Nested objects become [table] headers with their keys beneath. Arrays of objects become [[array-of-tables]] sections, one per element, and arrays of scalars become inline TOML arrays.
How are strings quoted?
All strings use TOML basic strings (double quotes) with the required escapes: \n, \t, \r, \\ and \" are written explicitly. Non-ASCII characters pass through as UTF-8, which TOML fully supports.
What happens with null values?
TOML has no null type. Null values are written as the string "null" so nothing is silently dropped — keep this in mind when reading the output back, or remove null fields before converting.
How do arrays of objects look?
Each object in an array becomes its own [[path]] section, exactly the TOML idiom. Objects with nested objects inside also get their own child tables beneath the [[path]] header, so nesting is preserved fully.
Are numbers preserved?
Yes. Integers and decimals are emitted in their literal form, booleans as true/false, and arrays of mixed scalars as inline arrays like ["a", 1, true].
Is my JSON uploaded anywhere?
No. Conversion happens entirely in your browser. Nothing is uploaded, stored or logged.

Related Tools

TOML to JSON

JSON Tools

JSON to CSON

JSON Tools

JSON to Properties

JSON Tools

Flatten JSON Object

JSON Tools

JSON to Plain Text Converter

JSON Tools

Base64 to JSON Converter

JSON Tools