Free JSON to TOML Converter
Convert JSON to TOML instantly — free, browser-only, no data sent to any server.
Input JSON
Converted TOML
What Is JSON to TOML?
You've got a JSON config and you need it as TOML — maybe for Cargo, Python's Poetry, or any tool using TOML. Manually reformatting JSON to TOML syntax is tedious and mistake-prone. Paste your JSON here and get TOML output instantly. The JSON specification defines the input and the TOML spec governs the output. Everything runs in your browser — nothing reaches any server. For the reverse, use our TOML to JSON tool.
JSON to TOML Examples
Convert JSON to TOML. Telecom-themed example:
Example: Subscriber config
TOML Output:
Click the Sample button above to load more examples into the editor.
How to Use This Tool
Paste or Upload JSON
Paste your JSON or upload a file. Use Sample to load an example.
Review the TOML Output
The right panel shows converted TOML. Nested objects become TOML tables.
Copy or Download
Use Copy or Download. For formatting JSON first, use the JSON Formatter. For validation, use the JSON Validator.
Where JSON to TOML Helps
When migrating config from JSON to TOML (e.g. for Python's Poetry or Rust's Cargo), paste your JSON here to get TOML. API responses in JSON can be converted for config files. For the reverse, use TOML to JSON. For YAML, use JSON to YAML.
Frequently Asked Questions
How do I convert JSON to TOML automatically?
Paste your JSON in the input, click Convert or wait for live conversion, then copy or download the TOML output. No install, no account needed.
When should I use TOML instead of JSON?
TOML is designed for human-editable config files — it supports comments and is easier to read than JSON. JSON is better for API payloads and machine-generated data. Cargo.toml and pyproject.toml are common real-world examples.