parseformat.com

TOML → Formatted

Ln 1, Col 1 0 characters
Output
1 lines 0 keys

Free Online TOML Formatter, Beautifier & Validator

Use this free TOML formatter to beautify Cargo manifests, pyproject.toml files, application configs, and CI settings. Normalize structure, minify for compact storage, and validate syntax — all instantly in your browser without uploading files to a server.

TOML is widely used in Rust (Cargo), Python (Poetry, Hatch), and modern app configuration. This tool helps you clean up messy configs, spot syntax errors before deployment, and prepare readable documents for code review. Your secrets never leave your device.

How to use

  1. Paste TOML into the input panel, or click Upload to load a .toml file.
  2. Click Beautify to normalize keys, tables, and spacing.
  3. Click Minify to remove extra blank lines and trailing whitespace.
  4. Click Validate to check the document for syntax errors.
  5. Copy or download the formatted result from the output panel.

What you can do

  • Normalize table headers and key ordering
  • Minify TOML by trimming blank lines and whitespace
  • Validate syntax and surface parse errors with line numbers
  • Handle inline tables, arrays, and array-of-tables
  • Upload from a local file or load from a public URL
  • Copy or download beautified TOML

Common use cases

  • Clean up Rust Cargo.toml dependency tables
  • Format Python pyproject.toml project metadata
  • Validate config files before shipping to production
  • Make hand-edited config diffs easier to read in pull requests
  • Quickly check TOML syntax when editing CI or tool configs

TOML formatting tips

TOML uses key = value pairs. Tables are declared with [section] headers, and arrays of tables use [[section]]. Strings with special characters should be quoted, and comments start with #. 

# Cargo-style snippet
[package]
name = "my-app"
version = "0.1.0"
edition = "2021"

[dependencies]
serde = "1.0"

Frequently asked questions

Why does my TOML fail to parse?

Common causes include duplicate keys in the same table, invalid date or number formats, unquoted strings with special characters, and mismatched table headers. Click Validate to see the exact error location.

Is my data uploaded to a server?

No. Formatting and validation run entirely in your browser. Your configuration files and secrets never leave your device.

Does beautifying change my values?

Beautify normalizes structure and spacing. Keys, values, and data types remain the same, but comments are removed because the parser does not preserve them.