Developer tool · Free · No sign-up

JSON - CSV Converter

Convert JSON arrays to CSV or CSV to JSON instantly in your browser.

Input (JSON)

Output (CSV)

// Converted CSV will appear here...

About this tool

Moving data between web APIs (JSON) and spreadsheets (CSV) is a daily task for developers and data analysts. This two-way converter instantly translates JSON arrays into clean, Excel-ready CSV files, or parses CSV files back into structured JSON objects. It intelligently handles nested objects, escaped quotes, and automatically detects data types like numbers and booleans. Everything runs locally in your browser.

Key features

Two-Way Conversion

Instantly switch between JSON -> CSV and CSV -> JSON modes.

Smart Type Detection

Automatically parses numbers and booleans when converting CSV to JSON.

Quote & Comma Escaping

Correctly handles CSV values containing commas or double quotes.

How to use it

1Select your conversion mode (JSON to CSV or CSV to JSON).
2Paste your source data into the left text area.
3Click the 'Convert' button.
4Copy the formatted output from the right text area.

Common use cases

Exporting API response data to open in Excel or Google Sheets.
Importing a legacy CSV database into a modern NoSQL or SQL database.
Quickly reformatting data for testing frontend components.

Frequently asked questions

Does it handle nested JSON objects?

Yes. If your JSON contains nested objects or arrays, they will be converted into escaped JSON strings within the CSV cell so no data is lost.

How does it handle commas inside CSV values?

The parser correctly identifies values wrapped in double quotes (e.g., "Smith, John") and will not split them into separate columns.

Is my data sent to a server?

No. All parsing and conversion happens entirely in your browser using JavaScript. Your data is completely private.

Private and free. Most of our tools run entirely in your browser, so the data you enter isn't uploaded or stored. There's no sign-up, and there never will be — they're built by the Fusion Trail Solutions team to be genuinely useful.