TOML to JSON
ConverterParse a TOML document into JSON with tables, arrays, dates and multiline strings for inspecting, debugging and migrating configuration files.
About TOML to JSON
When you need to read TOML config in code, or feed Cargo.toml / pyproject.toml content to a JSON-only API, you need TOML→JSON conversion. This tool parses the full TOML grammar — tables, arrays of tables, inline tables, date-times — locally in your browser and outputs standard JSON, reporting parse failures clearly. Nothing is uploaded. Tip: Bookmark this tool for quick access whenever you need format conversion. All processing happens locally in your browser — no data upload, so feel free to paste sensitive content.
How to Use
- Open the TOML to JSON tool page
- Enter or paste your data into the input area
- View the real-time results and use the copy button to get the output
Use Cases
- Read project metadata — Convert pyproject.toml / Cargo.toml to JSON to extract version, dependencies, etc. via script.
- Feed configs to APIs — Convert TOML to JSON to submit via REST to services that only accept JSON.
- Display configs in frontend — Browsers cannot parse TOML natively; convert to JSON for direct rendering.
- Check types — See how TOML dates, integers, and floats map to JSON types to debug type issues.
- Diff configs — Convert two TOML files to JSON, then use the JSON Diff tool to compare.
- Validate schema — Convert TOML to JSON then feed the result into a JSON Schema validator for config validation.
- CI pipeline variables — Transform a TOML-based local config into JSON for injection into a CI/CD environment block.
FAQ
What do TOML dates become?
Native TOML date-times become ISO 8601 JSON strings, since JSON has no dedicated date type.
How do arrays of tables [[x]] map?
They map to JSON object arrays, i.e. "x": [ {...}, {...} ] — as you would expect.
Does it support all TOML 1.0 features?
It supports mainstream features: inline tables, arrays of tables, multi-line strings, all scalars. Rare edge syntax may need manual tweaks.
Why a duplicate-key error?
TOML forbids redefining a key within the same table. The error points to the conflict — remove the duplicate.
Can I convert to YAML?
Yes, use our TOML to YAML tool.
Any browser compatibility requirements?
This tool works in all modern browsers (Chrome, Firefox, Edge, Safari). No plugins or extensions required.
Can I use it offline?
After initial load, most features work offline. The core logic runs entirely in your browser with no network dependency.
Comments
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