How does CSV map to JSON?

The header row becomes object property names and each following row becomes one object. Converting nested data to CSV works best when the records are flat.

Can every nested structure be converted without loss?

No. JSON, YAML, XML, and CSV represent structure differently. CSV in particular has no native nested-object model, so review the result when moving between unlike formats.

What does the Swap action do?

It exchanges the selected source and target formats and uses the current output as the new input when a valid result is available.

JSON · YAML · CSV · XML Converter

LocalFree

Convert structured data between JSON, YAML, CSV, and XML in any direction. Paste, pick the formats, and copy the result — everything runs in your browser.

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Runs in your browser; files and input stay on this device

About data format conversion

JSON, YAML, CSV, and XML all describe structured data in different shapes — JSON for APIs, YAML for config, CSV for spreadsheets, and XML for legacy and document formats. This tool parses your input into a common structure and re-serializes it into the target format, so you can move data between systems without hand-editing. Conversion happens entirely client-side; nothing is uploaded.

How to use JSON to YAML to CSV to XML Converter

1Choose the source and target formats: JSON, YAML, CSV, or XML.
2Paste the source data; the converted output and any parse error update automatically.
3Copy the result or download it with the target file extension.

Frequently asked questions

How does CSV map to JSON?: The header row becomes object property names and each following row becomes one object. Converting nested data to CSV works best when the records are flat.
Can every nested structure be converted without loss?: No. JSON, YAML, XML, and CSV represent structure differently. CSV in particular has no native nested-object model, so review the result when moving between unlike formats.
What does the Swap action do?: It exchanges the selected source and target formats and uses the current output as the new input when a valid result is available.