CSV to JSON Converter – Free Online CSV-to-JSON Tool

Convert CSV data to formatted JSON — or turn a JSON array of objects back into comma-separated CSV — instantly in your browser. The first CSV row is used as the JSON key names. Perfect for developers, data analysts, and spreadsheet users who need to switch between formats without writing code. No login or installation required.

Conversion Direction

How to Use the CSV ↔ JSON Converter

Operation options:

  • CSV → JSON: The first row of your CSV is treated as the object keys. Each subsequent row becomes one object in the JSON array.
  • JSON → CSV: The keys of the first object in your JSON array become the CSV header row. All array items are serialized as rows.

How to use:

  1. Paste or type your CSV or JSON into the Input area.
  2. Select the conversion direction: CSV → JSON or JSON → CSV.
  3. The result appears instantly in the Output area. Use Copy to copy it, or Clear to reset.

Tips:

For CSV → JSON:

  • Fields containing commas or quotes must be wrapped in double-quotes (e.g. "New York, NY").
  • Every data row must have the same number of columns as the header row.
  • All values in the JSON output will be strings.

For JSON → CSV:

  • Input must be a JSON array of flat objects (no nested objects).
  • Nested objects or arrays inside values will be serialized as JSON strings.
  • Column order follows the key order of the first object.