JSON to TOML Converter

What is TOML?

TOML (Tom's Obvious, Minimal Language) is a minimal configuration file format that's easy to read due to obvious semantics. It maps unambiguously to a hash table and is designed to be a minimal configuration file format. Unlike YAML, TOML has a strict specification with no ambiguity — the same file always means the same thing.

TOML is the native configuration format for Rust's Cargo package manager (Cargo.toml), Python's modern packaging (pyproject.toml), the Hugo static site generator, and many other tools. Converting JSON configs to TOML is a common task when integrating with these ecosystems.

JSON vs TOML Data Types

Step-by-Step TOML Conversion

Step 1: Start with a JSON config

{
  "package": {
    "name": "my-app",
    "version": "1.0.0",
    "authors": ["Jane Doe <jane@example.com>"]
  },
  "dependencies": {
    "serde": "1.0",
    "tokio": "1.35"
  },
  "profile": {
    "release": {
      "opt-level": 3,
      "lto": true
    }
  }
}

Step 2: Paste and convert

Paste the JSON above and click "Convert to TOML". The converter automatically handles nested objects as TOML sections and arrays of objects as TOML array-of-tables.

Expected TOML output

[package]
name = "my-app"
version = "1.0.0"
authors = ["Jane Doe <jane@example.com>"]

[dependencies]
serde = "1.0"
tokio = "1.35"

[profile.release]
opt-level = 3
lto = true

Common TOML Use Cases

Frequently Asked Questions