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UtilKit

JSON and CSV Converter

Mode

JSON

CSV

Example

How to use

  1. 1.

    Choose 'JSON → CSV' or 'CSV → JSON'

  2. 2.

    Paste your JSON or CSV into the input panel - it converts as you type, and any error or row warning appears in the output panel

  3. 3.

    Copy or download the result, or press Swap to convert it back

Common uses

  • ▸

    Converting an API JSON response into a spreadsheet-friendly CSV

  • ▸

    Importing CSV data into a system that expects JSON

  • ▸

    Spotting inconsistent records in a JSON array - every key gets a column, so missing fields show up as empty cells

Similar tools

CSV Viewer
JSON Formatter

Frequently asked questions

What JSON structure works best?

An array of objects. The columns are every key found across all the objects, in the order they first appear, so objects with missing or extra keys still line up - a missing value becomes an empty cell. An array of plain values becomes a single "value" column, and an array of arrays is written row by row without a header.

What happens with nested objects?

Nested objects and arrays are serialized as JSON strings within the CSV cell. Flatten your JSON first if you need nested fields as separate columns.

Can I convert CSV back to JSON?

The tool works in both directions. Choose CSV → JSON and paste CSV with a header row to get an array of objects keyed by the header, with every value as a string. Commas, semicolons, tabs and pipes are detected automatically, and a row with too few or too many fields is still converted, with a warning naming the row. Fields beyond the header are kept under keys named by their column position, such as column_4.

Is my data sent to a server?

Conversion runs entirely in your browser. No data is uploaded or stored.

Can I download the result?

Yes. Download saves the result as converted.csv or converted.json, depending on the direction.