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How to Format TOML - Step by Step Guide

Step 1

Input Your TOML Configuration

Get your TOML configuration into the formatter! Whether you're working with Cargo.toml files, Python pyproject.toml, or any other config file:

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Paste directly: Copy your TOML configuration and paste it into the input editor
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Upload a file: Click "Upload" to select a .toml file from your computer
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Try the sample: Click "Sample" to load example TOML configuration

Example: Unformatted TOML Input

Here's what messy, unformatted TOML looks like:

[package]
name   =   "my-app"
version="1.0.0"
edition=   "2021"
[dependencies]
serde=   "1.0"
tokio = {  version="1.0",   features=[   "full"   ]}
[dev-dependencies]
test-utils   ="0.1"
Step 2

Automatic Formatting & Validation

The magic happens instantly! As soon as you input TOML, the formatter automatically follows the TOML v1.0.0 specification:

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Validates syntax: Checks for errors in section headers, key-value pairs, and data types
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Adds proper spacing: Standardizes spacing around equals signs and in arrays
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Organizes sections: Adds proper line breaks between sections for readability

Example: Beautifully Formatted Output

The same TOML, now properly formatted and readable:

[package]
name = "my-app"
version = "1.0.0"
edition = "2021"

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

[dev-dependencies]
test-utils = "0.1"
Step 3

Choose Format Options

Customize your output based on your needs! The formatter gives you control over how your TOML appears:

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Pretty format: Default beautified TOML with proper spacing and organization
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Minify: Remove comments and extra whitespace for compact files
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Copy or download: Use the Copy button to copy to clipboard or Download to save as a .toml file

Frequently Asked Questions About TOML Formatting

What is TOML and why format it?

TOML (Tom's Obvious, Minimal Language) is a configuration file format that's easy for humans to read and write. It's widely used in Rust (Cargo.toml), Python (pyproject.toml), and many other projects. Formatting TOML ensures consistent syntax, proper spacing, and makes configuration files easier to maintain and share with team members.

How does the TOML formatter validate my configuration?

Our formatter checks for: proper key-value pair syntax (key = value), valid section headers [section] and [[array]], correct data types (strings, numbers, booleans, arrays), duplicate key detection, and proper escaping in strings. If there's an error, you'll get a detailed message with the line number to help you fix it quickly.

Can I use this for Cargo.toml and pyproject.toml files?

Absolutely! This formatter works with any valid TOML file, including Cargo.toml for Rust projects, pyproject.toml for Python projects, configuration files for various tools, and any custom TOML configuration files you're working with.

What's the difference between formatting and minifying TOML?

Formatting (beautifying) adds proper indentation, spacing, and line breaks to make your TOML easy to read and maintain. Minifying removes comments and extra whitespace to create the smallest possible file size. Use formatting for development and documentation, and minifying when you need to reduce file size for production deployments.

Is my TOML configuration data secure?

Yes! All TOML processing happens entirely in your browser. Your configuration data never leaves your computer or gets sent to any server. This makes it completely safe to format sensitive configuration files, including those with credentials or API keys. However, we always recommend removing sensitive information before sharing formatted configs publicly.

Can I convert between TOML and other formats?

Yes! We offer several conversion tools: TOML to JSON for converting to JSON format, JSON to TOML for converting from JSON, YAML to TOML and TOML to YAML for YAML conversions, and TOML Validator for validation with detailed statistics.

Related Tools

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