JSON ⇄ YAML ⇄ CSV Converter

This converter moves data between JSON, YAML and CSV in any direction — JSON to CSV, CSV to JSON, YAML to JSON and back — entirely in your browser. Nothing is uploaded to a server, which makes it safe for API responses, config files with secrets, or production database exports. You can paste text, or drop a .json, .yaml or .csv file up to 5 MB straight onto the input pane.

Each format gets proper treatment rather than a naive string swap. JSON is strictly parsed and pretty-printed with your choice of 2-space, 4-space or tab indentation, with optional recursive key sorting. YAML goes through a full parser, so quoting, multi-line values and nested lists behave correctly. CSV parsing is RFC-4180 aware — quoted fields, embedded delimiters and newlines inside quotes all work — and you can switch the delimiter between comma, semicolon, tab and pipe, with optional type inference that turns "42", "true" and "null" into real numbers, booleans and nulls.

The tricky part of any JSON-to-CSV conversion is nesting, and this tool handles it losslessly: nested objects are flattened into dotted column names (address.city), arrays of scalars are joined into one cell, and arrays of objects are stored as JSON strings. Going the other way, dotted CSV headers rebuild the original nested structure. The swap button feeds valid output back in as input, so you can round-trip data through formats without re-pasting.