TOML Formatter

TOML Formatter

Embodies warmth, creativity, and the welcoming spirit of tropical paradise.

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Privacy Promise

Your content never leaves your browser. All processing happens locally on your device using JavaScript. We do not store, record, or transmit your input data to any server.

Client-Side Processing
No Server Logs

Format and validate TOML data.

Key Features

Format & Beautify

Instantly format and beautify TOML files. Makes TOML configs readable and properly structured for Rust (Cargo), Python (pyproject.toml), and other tools.

Validation

Validates TOML syntax and structure in real-time. Detects errors, types, and invalid TOML instantly with clear error messages.

100% Client-Side

All processing happens in your browser. Your TOML configuration files never leave your device, ensuring complete privacy and security.

When to choose TOML?

Configuration Files

TOML is the gold standard for configuration files. Its key-value pair structure is intuitive and easy for humans to edit without syntax errors. Perfect for project settings like Cargo.toml (Rust) or pyproject.toml (Python).

Readability First

Choose TOML when you want data to be readable. Unlike JSON, it supports comments and doesn't require quotes for every key. Unlike YAML, it avoids ambiguous whitespace parsing issues.

Simple Data Structures

Use TOML for flat or moderately nested data. If your data is deeply nested or complex (like API responses), JSON might be better. TOML shines where clarity and simplicity are paramount.

Frequently Asked Questions

What is TOML?▼
TOML (Tom's Obvious, Minimal Language) is a configuration file format designed to be easy to read. It's used in Cargo.toml (Rust), pyproject.toml (Python), and many other project configurations.
How do I validate TOML?▼
Paste your TOML into the editor. The tool automatically validates syntax and displays errors with line numbers. Common issues like missing brackets, invalid dates, and incorrect arrays are caught instantly.
TOML vs JSON vs YAML — which should I use?▼
Use TOML for configuration files — it supports comments and is easy to edit. Use JSON for APIs and data exchange. Use YAML for DevOps configs (Docker, Kubernetes). TOML avoids YAML's whitespace pitfalls and JSON's lack of comments.
Is my TOML data secure?▼
100% private. All parsing and formatting happens entirely in your browser using smol-toml. Your configuration files are never uploaded to any server — ideal for files containing API keys or credentials.