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JSON to CSV Converter

100% Client-Side

Convert JSON arrays of objects into RFC 4180 compliant CSV files with automatic key union and quotation escaping in your browser.

JSON Array Input

CSV Output

How to Use JSON to CSV Converter

Paste JSON Array

Enter valid JSON containing an array of objects [ { ... }, { ... } ].

Extract Headers & Rows

Click Convert to CSV to union all object keys and format rows.

Export CSV File

Copy the CSV or download as a .csv file ready for Excel or Google Sheets.

✓ Automatic Key Union

Detects all distinct keys across objects, even if some items have missing fields.

✓ RFC 4180 Compliant

Properly encloses strings containing commas, quotes, or line breaks in double quotes.

✓ Instant Processing

Transforms large datasets in milliseconds with zero network delay.

🔒 Complete Client-Side Isolation

This tool runs entirely in your local browser runtime. No logs, analytics tracking, or remote server transmissions occur.

Upload or paste CSV spreadsheet data to view, search, and inspect records in a clean, responsive data table with zero server uploads.

Convert CSV spreadsheet tables into structured JSON arrays of objects with automatic header mapping and data type detection.

Analyze any local file byte size, MIME type, extension, and calculate estimated transfer speeds on 4G, 5G, and broadband networks.