Format TOML Table
Input
[server]
host = 'localhost'
port = 8080
enabled = true
Example output
[server]
host = "localhost"
port = 8080
enabled = true
TOML Formatter & Validator
YAML, TOML & Config100% Client-SideReady
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About this tool, examples & FAQ
Format messy TOML configuration files into clean, readable tables and key-value pairs or validate syntax directly in your browser without uploading files to remote servers.
Key facts
| Formatter Engine | smol-toml spec-compliant parser in Web Worker |
|---|---|
| Supported Operations | Format TOML and Validate TOML |
| Privacy & Security | 100% Client-side execution; config files are never uploaded |
| Maximum Input | 5 MB |
How to use
- Paste your TOML document (e.g. Cargo.toml, pyproject.toml) into the input editor.
- Click 'Format TOML' to beautify the configuration structure and align key-values.
- Switch to 'Validate TOML' to quickly verify syntax compliance.
- Copy or download the formatted configuration file.
Examples
Validate TOML Syntax
Input
[package]
name = 'demo'
version = '0.1.0'
Example output
Valid TOML document.Edge cases
Dotted Keys vs Nested Tables
TOML permits both dotted keys (a.b.c = 1) and nested table headers ([a.b]). The formatter standardizes tables into clean hierarchical structures.
Date and Time Primitives
RFC 3339 offset dates, local date-times, and local times are parsed accurately without timezone distortion.
Array of Tables
Double-bracket table arrays ([[products]]) format consistently with clear section boundaries.
How it works
- Tokenizes the configuration using an official TOML v1.0.0 compliant parser in an isolated Web Worker.
- Reconstructs tables, arrays, multiline strings, and scalar primitives.
- Produces normalized TOML output and reports accurate line/column locations on syntax errors.
- Dispatches the sanitized result directly back to the workspace pane.
Related workflows
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Code Snapshot
Render pasted code as a styled SVG snapshot with syntax highlighting, themes, window frames, and gradient backgrounds for blogs and docs.
Frequently asked questions
Are my config files uploaded or analyzed on a server?
No. All parsing and formatting is performed entirely in your browser using client-side Web Workers.
Which TOML specification does this formatter follow?
The formatter fully adheres to the official TOML v1.0.0 specification, including inline tables, arrays, and standard string escape rules.
Can I format Cargo.toml or pyproject.toml files?
Yes. Standard Rust Cargo, Python pyproject, Go Hugo, and other ecosystem TOML files format cleanly.
References
- TOML v1.0.0 Specification — Follows official TOML v1.0.0 syntax and parsing guidelines