Convert TOML to JSON Online
Free, private TOML to JSON converter. Your files never leave your browser. All processing happens locally on your device.
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How to convert TOML to JSON
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Why convert TOML to JSON?
TOML and JSON serve different purposes. Converting between them lets you use whichever format works best for your situation.
What is a TOML file?
Tom's Obvious, Minimal Language: TOML is a configuration format designed to be easy to read. It looks similar to INI files but supports nested tables and typed values. Rust's Cargo and Python's pyproject.toml use it.
Created by: Tom Preston-Werner (GitHub co-founder), first released in 2013
Used for: Configuration files (Cargo.toml, pyproject.toml), application settings
Technical details: Key-value pairs with sections (tables). Supports strings, integers, floats, booleans, dates, arrays, and nested tables. Minimal syntax.
Compatibility: Supported by most modern programming languages via libraries. Common in Rust and Python ecosystems.
What is a JSON file?
JavaScript Object Notation: JSON is the standard format for exchanging data between web applications. APIs, config files, and data storage all use it. The format is simple enough to read by eye but structured enough for machines to parse.
Created by: Douglas Crockford, popularized in the early 2000s
Used for: APIs, configuration files, data exchange, web applications, NoSQL databases
Technical details: Text-based format supporting objects, arrays, strings, numbers, booleans, and null. No comments in standard JSON. Nested structures allowed.
Compatibility: Every programming language has a JSON parser. All modern web APIs use it.
TOML vs JSON
| Feature | TOML | JSON |
|---|---|---|
| Type | Tom's Obvious, Minimal Language | JavaScript Object Notation |
| Best for | Configuration files (Cargo.toml, pyproject.toml), application settings | APIs, configuration files, data exchange, web applications, NoSQL databases |
| Compatibility | Supported by most modern programming languages via libraries. Common in Rust and Python ecosystems. | Every programming language has a JSON parser. All modern web APIs use it. |
| Pros | Very readable, explicit types, less error-prone than YAML | Human-readable, universal in web development, supports nested data |
| Cons | Less common than JSON or YAML, deeply nested data gets awkward | No comments, no date type, verbose for large datasets compared to binary formats |