TOML to JSON Converter Online
Convert TOML configuration files to JSON format instantly.
Processed locally in your browserConvert TOML configuration files to JSON format instantly with this free online TOML to JSON converter.
TOML
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Max 5MB
JSON
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How to Use
Convert TOML configuration files to JSON format instantly with this free online TOML to JSON converter.
- Paste or upload your TOML. Enter TOML content into the left panel or upload a .toml file. You can also select a built-in preset (Cargo.toml, pyproject.toml, Hugo config) to see a working example.
- View the JSON output. The converted JSON appears instantly in the right panel with proper indentation. A green "Valid" badge confirms your TOML was parsed successfully.
- Adjust formatting. Use the indent selector to switch between 2-space and 4-space JSON indentation.
- Copy or download. Use the copy button to grab the JSON output, or download it as a .json file for use in your project.
TOML is popular in Rust (Cargo.toml), Python (pyproject.toml), and static site generators like Hugo. Converting TOML to JSON is useful when you need to feed configuration into tools that only accept JSON, or when migrating between config formats. All parsing happens in your browser — your config files stay private.
Features
- ✓Real-time TOML to JSON conversion
- ✓Built-in example presets (Cargo.toml, pyproject.toml)
- ✓TOML validation with error details
- ✓Customizable JSON indentation
- ✓File upload and download support
Frequently Asked Questions
- What is TOML?
- TOML (Tom's Obvious Minimal Language) is a configuration file format that is easy to read and write. It is commonly used in Rust (Cargo.toml), Python (pyproject.toml), and Hugo projects. TOML maps unambiguously to a hash table and is designed to be minimal and obvious.
- How do I convert TOML to JSON?
- Paste your TOML content into the left panel, and the JSON output will appear instantly on the right. You can also upload a .toml file or select one of the built-in presets (Cargo.toml, pyproject.toml, Hugo config) to see the conversion in action.
- Is TOML better than JSON for configuration?
- TOML is often preferred for configuration files because it supports comments, is more human-readable, and has a cleaner syntax for nested structures. JSON is better for data interchange and API communication. Many modern tools like Rust's Cargo and Python's pip use TOML for configuration while using JSON for data.
- Does this tool validate my TOML?
- Yes, the converter validates your TOML in real-time. A green "Valid" badge appears when the TOML is correctly formatted, and specific error messages with line numbers are shown when there are syntax errors.
- Is my data secure?
- Absolutely. All TOML parsing and JSON conversion happens entirely in your browser using JavaScript. No data is transmitted to any server. Your configuration files stay on your device.