TOML Formatter

TOML Formatter | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Format Conversion
Input types: textarea, number, select
Output type: text
Sample coverage: 4
API ready: Yes

Overview

The TOML Formatter is a utility designed to clean up, beautify, or minify your TOML configuration files. It parses your input and outputs structured, readable TOML, though please note that comments are removed and the order of keys may change during processing.

When to use

When you need to clean up messy or poorly indented TOML configuration files for projects like Rust or Python.
When you want to minify TOML data to reduce file size for storage or transmission.
When validating the syntax of a TOML snippet to ensure it parses correctly without syntax errors.

How it works

1Paste your raw TOML configuration text into the TOML Input area.
2Select your formatting mode, choosing either Beautify to format with indentation or Minify to compress the output.
3Adjust the indentation size if needed, then run the formatter to generate the clean TOML output.

Use cases

Beautifying a cluttered Cargo.toml file for a Rust project to improve readability.
Minifying pyproject.toml configurations to save space in automated deployment pipelines.
Checking and fixing indentation inconsistencies in Hugo static site generator configuration files.

Examples

1. Beautifying a Rust Cargo.toml File

Rust Developer

Background

A developer has a messy Cargo.toml file with inconsistent spacing, mixed indentation, and unaligned keys.

Problem

The configuration file is hard to read and maintain during code reviews.

How to use

Paste the messy Cargo.toml content into the TOML Input field, set the Mode to Beautify, set Indent Size to 2, and run the formatter.

Mode: Beautify, Indent Size: 2

Outcome

The TOML is cleanly formatted with consistent indentation, making it easy to read, though comments are removed.

2. Minifying a Hugo Site Configuration

DevOps Engineer

Background

A DevOps engineer wants to reduce the size of a large config.toml file used in a static site deployment pipeline.

Problem

The configuration file contains unnecessary whitespace and line breaks that increase the payload size.

How to use

Paste the config.toml content into the input area, change the Mode to Minify, and process the input.

FAQ

Why did my comments disappear after formatting?

The underlying parser does not preserve comments during the parsing and serialization process.

Why did the order of my keys change?

The formatter parses TOML into an internal data structure where key order is not guaranteed to remain identical to the input.

Can I minify my TOML file using this tool?

Yes, you can switch the mode option from Beautify to Minify to compress your TOML data.

What indentation sizes are supported?

You can configure the indentation size from 0 to 8 spaces, with 2 spaces being the default standard.

Does this tool validate TOML syntax?

Yes, if the input TOML contains syntax errors, the formatter will fail to parse it and will display an error message.

Mode: Minify

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Inputs

Result

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Beautifying a Rust Cargo.toml File

2. Minifying a Hugo Site Configuration

FAQ

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