TOML Formatter
Format and validate TOML configuration files with proper indentation
Last updated: November 13, 2025
How to use
- Paste your TOML configuration in the input area
- Click "Load Example" to see a sample TOML file
- Click "Format TOML" to validate and format the content
- The tool will check for syntax errors and format with proper spacing
- Copy the formatted output or download as a file
About TOML
TOML (Tom's Obvious, Minimal Language) is a configuration file format that's easy to read due to obvious semantics. It's designed to map unambiguously to a hash table and is commonly used for configuration files in many projects.
Result actions
Copy or download the tool output, or share a link to TOML Formatter.
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What is TOML Formatting?
TOML formatting organizes TOML (Tom's Obvious, Minimal Language) configuration files with consistent indentation, proper structure, and readable formatting. TOML is a configuration file format designed to be easy to read and write, commonly used in projects like Cargo (Rust), Poetry (Python), and many other tools.
Why Format TOML?
TOML formatting improves configuration file quality:
- Readability: Makes TOML files easier to read and understand
- Consistency: Ensures consistent formatting across configuration files
- Validation: Identifies syntax errors and formatting issues
- Maintenance: Simplifies editing and updating configuration files
- Standards: Follows TOML specification and best practices
Common Use Cases
Configuration File Management
Format TOML configuration files for applications, build tools, and services. Well-formatted config files are easier to maintain and troubleshoot.
Project Configuration
Format TOML files like pyproject.toml, Cargo.toml, or package.toml for Python, Rust, and other projects. Proper formatting makes project configuration more readable.
Build Tool Configuration
Format TOML files used by build tools and package managers. Ensures configuration is properly structured and easy to modify.
DevOps Configuration
Format TOML configuration files for DevOps tools and infrastructure. Proper formatting improves configuration management.
Code Review
Format TOML files before code reviews to make them easier to review and understand.
TOML Format Features
TOML supports various data types and structures:
- Strings: Single-line and multi-line strings
- Numbers: Integers and floats
- Booleans: True/false values
- Dates: Date and time values
- Arrays: Lists of values
- Tables: Key-value pairs and nested structures
- Array of Tables: Arrays of table objects
TOML Formatting Best Practices
- Consistent Indentation: Use consistent indentation for nested tables
- Group Related Settings: Organize related configuration in tables
- Validate Syntax: Always validate TOML syntax before using
- Comments: Use comments to document configuration options
- Readability: Format for human readability, not just machine parsing
TOML vs Other Formats
- TOML vs JSON: TOML is more human-readable, JSON is more compact
- TOML vs YAML: TOML is simpler and more explicit, YAML is more flexible
- TOML vs INI: TOML is more structured and supports more data types
Privacy and Security
Our TOML Formatter processes all configuration data entirely in your browser. No TOML content is sent to our servers, ensuring complete privacy for sensitive configuration files.
Related Tools
If you need to work with TOML in other ways, check out:
- TOML to JSON: Convert TOML to JSON format
- YAML to TOML: Convert YAML to TOML format
- JSON Formatter: Format and validate JSON data