TOML Formatter Free Online Tool 2026

Last updated March 22, 2026

What Is TOML?

TOML (Tom's Obvious, Minimal Language) is a configuration file format designed to be easy to read and write. It maps unambiguously to a hash table and is used by Rust's Cargo, Python's pyproject.toml, and many other tools. TOML is more readable than JSON for configuration (supports comments, multi-line strings) and less ambiguous than YAML (no implicit type coercion).

TOML Syntax Overview

# This is a TOML comment

[package]
name    = "my-app"
version = "1.0.0"
authors = ["Alice <alice@example.com>"]

[dependencies]
serde = { version = "1.0", features = ["derive"] }
tokio = "1.0"

[[servers]]
host = "192.168.1.1"
port = 8080

[[servers]]
host = "192.168.1.2"
port = 8081

[database]
url      = "postgres://localhost/mydb"
max_conn = 10
enabled  = true

[paths]
data = "/var/data"
logs = """
/var/log/app
/var/log/error
"""

TOML vs YAML vs JSON