About Format Swapper

What it is

Format Swapper converts between JSON, XML, CSV, and YAML — the four data formats developers move between constantly when working with APIs, config files, spreadsheets, and data pipelines. Paste data in, get it back in another format, instantly.

Why it's free and signup-free

Converting data between formats is a small, well-defined task — there's no reason to gate it behind an account or a paywall. Paste your data, click Convert, get the result. See our Privacy Policy for the specifics on how your data is handled.

Who it's for

Developers debugging an API response, data analysts reshaping an export for a spreadsheet, DevOps engineers translating a config between tools that disagree on format — anyone who needs a correct, fast, no-signup conversion without installing a CLI tool or writing a one-off script.

How conversions actually work

The converters follow explicit, documented rules rather than best-effort guessing: JSON object keys become XML element names, arrays become repeated sibling elements, and a leading @ marks an XML attribute. Nested JSON/XML/YAML structures flatten to CSV using dot-notation columns (address.city) and bracket-indexed columns for arrays (tags[0]), and unflatten the same way going back. Each conversion pair's page explains the specific rules and gotchas for that pair, since not every format pairing round-trips perfectly — XML and CSV, in particular, can't represent everything JSON or YAML can.

How it's funded

Format Swapper is free to use, with no account or signup. It's supported by ads and an optional Buy Me a Coffee link, not by selling or inspecting the data you convert — see the Privacy Policy for the specifics.

Questions or feedback

Reach out at contactus@formatswapper.com.