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CSV ↔ JSON Converter

What is this tool?

A two-way CSV/JSON converter. The CSV parser follows RFC 4180 conventions (quoted fields, escaped quotes, CRLF or LF), and the JSON side expects an array of flat objects.

When to use it

  • Loading spreadsheet data into code that expects JSON
  • Exporting a JSON array as a CSV for a spreadsheet or BI tool
  • Reshaping a data export between the two formats
  • Quickly inspecting a CSV as structured objects
  • Preparing seed or fixture data

How to use it

  1. 1Pick the direction: CSV → JSON or JSON → CSV
  2. 2Choose the delimiter your data uses
  3. 3Paste the input
  4. 4Read and copy the converted output
  5. 5For JSON → CSV, make sure the input is an array of flat objects

Frequently asked questions

How are quotes and commas inside a field handled?

Fields containing a delimiter, quote or newline are wrapped in double quotes, and inner quotes are doubled — standard CSV escaping.

What if rows have different columns?

Going to CSV, the header is the union of all keys and missing values are left blank. Going to JSON, every row is keyed by the header.

Does it handle nested JSON?

Nested objects and arrays are stringified into a single CSV cell. CSV is a flat format.

Is my data uploaded?

No — conversion happens entirely in your browser.