JSON ↔ YAML / CSV / XML / TOML

JSON, YAML, CSV, XML, and TOML all solve the same problem — structured data representation — with different syntax and different trade-offs. This tool converts between all of them in both directions, right in your browser.

How to use it

• Paste data in the source format and pick a target format — the conversion happens instantly.
• For CSV, the first row is automatically treated as column headers.
• Copy the result or download it as a file with the matching extension.

Common uses

• Converting an app's configuration from YAML to JSON (or back) to match a specific framework.
• Turning a spreadsheet export (CSV) into JSON for loading into a database or API.
• Reading a TOML config (common in the Rust/Python ecosystem) in the more familiar JSON format.

Things to keep in mind

JSON ↔ YAML and JSON ↔ TOML are usually lossless in both directions, since both formats support nesting the same way JSON does.

JSON → CSV loses nested structure: CSV is a flat tabular format, so nested objects and arrays either need to be flattened into separate columns or serialized as text.