This TOML formatter and converter is simple yet powerful. Here is a detailed guide:
Format TOML: Paste your TOML config file content into the input box and click the "Format TOML" button. The tool will automatically beautify your TOML by removing extra whitespace, aligning equals signs, standardizing indentation, and normalizing table headers. The formatted code is much easier to read and maintain.
Validate TOML: Paste TOML content into the input box and click "Validate TOML". The tool checks whether the TOML syntax is correct and shows the validation result. If syntax errors exist, it will report the error location and reason.
TOML to JSON: Paste TOML content and click "TOML → JSON". The tool converts the TOML config into JSON format. The resulting JSON can be used directly in JavaScript projects or API interfaces.
JSON to TOML: Paste JSON content and click "JSON → TOML". The tool converts JSON data into TOML format. The resulting TOML can be used in Python, Rust, Node.js, and other project configuration files.
TOML is widely used in web development and system configuration. Here are some typical scenarios:
Python Project Config: Python's PEP 518 recommends pyproject.toml as the project configuration file. Use this tool to easily format, validate, and convert pyproject.toml files to ensure configurations are correct.
Rust Project Config: Rust's Cargo uses Cargo.toml to manage dependencies and build settings. This tool helps developers quickly inspect and format Cargo.toml files.
Node.js Tool Config: Many Node.js tools (such as Vite, Next.js, etc.) support TOML format configuration files. Use this tool to freely convert between TOML and JSON, making it easy to migrate configurations between different projects.
TOML Format Overview: TOML (Tom's Obvious, Minimal Language) is a human-readable configuration file format created by GitHub co-founder Tom Preston-Werner in 2013. TOML's design goal is to be a simpler alternative to YAML and JSON, emphasizing human-friendliness.
TOML Basic Syntax: TOML uses key-value pairs, tables ([section]), and array tables ([[section]]) to organize data. Basic types include strings, integers, floats, booleans, arrays, and inline tables. TOML supports comments (starting with #), making config files easier to maintain.
TOML vs YAML vs JSON: JSON is a strict data exchange format with no comments, suitable for machine generation. YAML supports comments and more complex data structures, but its syntax is complex and error-prone. TOML strikes a balance between simplicity and readability, making it the best config format for human writers.
TOML (Tom's Obvious, Minimal Language) is a human-readable configuration file format. Designed by GitHub co-founder Tom Preston-Werner, it serves as a simpler alternative to YAML and JSON, widely used in Python (pyproject.toml), Rust (Cargo.toml), Node.js, and many other projects.
TOML uses key-value pairs and table structures with intuitive syntax and supports comments. JSON is a strict key-value format without comments but offers more direct nested structure support. TOML is ideal for human-written config files, while JSON works best for machine-generated data exchange.
This tool supports common TOML syntax including: basic key-value pairs (strings, integers, floats, booleans), tables ([section]), array tables ([[section]]), arrays ([1, 2, 3]), and inline tables ({key = value}). Multi-line strings and datetime types are not yet supported.
No. This tool processes everything locally in your browser. No data is ever uploaded to any server. You can use it with confidence without worrying about data privacy.
This tool uses standard TOML parsing algorithms to provide accurate results for common TOML syntax. However, since the TOML specification is complex, edge cases (special character escaping, datetime formats, etc.) should be manually verified before use.
This tool is suitable for small to medium-sized config files (typically under 1MB). For very large files, dedicated TOML processing tools or command-line utilities (such as Python's toml library or Node.js @iarna/toml) are recommended.
This tool works in all modern browsers including Chrome, Firefox, Safari, and Edge. We recommend using the latest version for the best experience.
If you encounter any issues or have feature suggestions, please email shexiangsheng@gmail.com. We value every piece of feedback and continuously improve the tool.