TOML-JSON Converter

Convert between TOML and JSON / sections, arrays, inline tables

100% In-BrowserNo Server UploadFree, No Signup

Data Conversion

Input (TOML)

Output (JSON)

How to Use

Choose a mode
Select "TOML → JSON" or "JSON → TOML" from the toolbar.
Paste input and convert
Paste TOML or JSON into the input area and click "Convert". Use "Swap" to toggle mode and swap input/output.
Copy result
Use the "Copy" button to copy the converted result to your clipboard.

TOML-JSON Converter Examples

TOML → JSON

Input

[package]
name = "my-app"
version = "1.0.0"
keywords = ["cli", "tool"]

Output

{
  "package": {
    "name": "my-app",
    "version": "1.0.0",
    "keywords": ["cli", "tool"]
  }
}

Sections ([table]) are converted as nested JSON objects.

JSON → TOML

Input

{
  "server": {
    "host": "localhost",
    "port": 8080
  }
}

Output

[server]
host = "localhost"
port = 8080

Nested JSON objects are output as TOML sections.

Features

Bidirectional TOML ↔ JSON conversion
Parse sections ([table]) and nested tables
Support strings, numbers, booleans, arrays, inline tables
Skip comment lines (#)
Swap button to toggle mode and input/output instantly
Customizable indent width
Local processing (your input is not sent to servers)

FAQ

Does it support the full TOML specification?

It covers core syntax (key=value, sections, strings, numbers, booleans, arrays, inline tables). Some advanced features like datetime types and multi-line literal strings have simplified support.

Can it convert Cargo.toml or pyproject.toml?

Yes. Common Cargo.toml and pyproject.toml syntax is supported.

Is my data sent to a server?

No. All conversion happens locally in your browser via JavaScript. Your input data is never transmitted to any external server.