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Flatten nested JSON objects and arrays to CSV. Handles complex nested structures with dot-notation column headers.
> Turn JSON arrays and API payloads into spreadsheet-ready CSV locally.
> Map columns, flatten nested objects, and download clean exports without uploads.
JSON parsing and CSV generation happen in your browser. No API response or export data is uploaded to our server.
// CSV output appears here...
Nested JSON structures can't be mapped directly to a flat CSV grid. Our converter uses dot-notation: {"user":{"city":"Berlin"}} becomes column user.city. Arrays within objects are serialized as pipe-delimited strings. This preserves all data while making it accessible in Excel or pandas DataFrames.
Using dot-notation: {address: {city: 'Berlin'}} becomes the column 'address.city'.
CSV to JSON
Convert CSV exports into clean JSON locally, inspect headers and rows, and copy or download API-ready output without uploads.
JSON Formatter
Validation, formatting and syntax highlighting for JSON.
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Generate JSON Schema draft 2020-12 with validation constraints for API and data pipelines.
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Encode and decode text to/from Base64 format with UTF-8 support.