JSON and CSV Converter

Convert data in both directions: JSON to CSV and CSV to JSON. Use this online tool instantly.

JSON to CSV

Accepts one object or an array of objects. Nested fields are flattened with dot notation.

JSON input

CSV to JSON

First row is treated as headers. Quoted CSV fields are supported.

CSV input

About This Tool

This free online JSON and CSV Converter helps you move structured data between developer and spreadsheet workflows quickly. Use JSON to CSV when you need table output for exports, reporting, or data review in spreadsheet software. Use CSV to JSON when you receive flat files and need object arrays for APIs, scripts, test fixtures, or automation pipelines.

All conversion runs client-side in your browser, which keeps data handling simple and fast. For JSON input, nested objects are flattened using dot notation so columns remain readable and consistent. For CSV input, the first row is used as column headers, with support for quoted fields and escaped quotes. This makes the tool useful for day-to-day data transformation without extra setup.