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TOML to JSON converter

Paste a TOML file to get JSON you can read in any programming language. Dates are written as text exactly as they appear in the file.

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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.

How to use it

  1. Enter toml text and indentation.
  2. The result appears straight away and updates as you edit.
  3. Copy the result, or copy a link that keeps the same values to share it.

How it is calculated

The file is read per TOML 1.0: [a] tables, dotted keys a.b = 1, [[a]] arrays of tables, { } inline tables, all four string kinds, integers with underscores, 0x, 0o and 0b, floats and dates. Defining a key or table twice is rejected, then JSON is written with 2 or 4 space indentation.

Example

Inputs: Indentation = 2 spaces. Result: JSON: { "package": { "name": "demo", "version": "0.1.0", "authors": [ "Sara", "Omar" ] }, "server": { "host": "0.0.0.0", "port": 8080, "started": "2026-01-15T09:30:00Z" }, "users": [ { "name": "Ali", "admin": true }, { "name": "Mona", "admin": false } ] }.

# Project settings
[package]
name = "demo"
version = "0.1.0"
authors = ["Sara", "Omar"]

[server]
host = "0.0.0.0"
port = 8080
started = 2026-01-15T09:30:00Z

[[users]]
name = "Ali"
admin = true

[[users]]
name = "Mona"
admin = false

{
  "package": {
    "name": "demo",
    "version": "0.1.0",
    "authors": [
      "Sara",
      "Omar"
    ]
  },
  "server": {
    "host": "0.0.0.0",
    "port": 8080,
    "started": "2026-01-15T09:30:00Z"
  },
  "users": [
    {
      "name": "Ali",
      "admin": true
    },
    {
      "name": "Mona",
      "admin": false
    }
  ]
}

Limits and caveats

  • Comments are dropped because JSON has none.
  • inf and nan have no JSON equivalent and give an error.
  • Dates become strings in JSON.

Questions about this tool

Why does it say a table is already defined?

TOML does not allow the same table header twice. Put its keys under a single header.

How does [[products]] look in JSON?

It becomes an array of objects, with each [[products]] section as one item in order.

Does it accept name = demo without quotes?

No. Strings in TOML need quotes, and the tool shows the line with the problem.

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