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CSV to JSON Converter

100% Client-Side

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

CSV Input (First row as headers)

JSON Output

Auto-parse numbers and booleans Minify JSON (no whitespace)

How to Use CSV to JSON Converter

Paste CSV Data

Enter comma-delimited text where the first row contains column headers.

Choose Formatting

Select 2-space pretty printing or compact minified JSON.

Copy or Download

Copy the resulting JSON array or download as a .json file.

✓ Automatic Type Parsing

Detects numbers and booleans to generate native JSON types instead of strings.

✓ Header-to-Key Mapping

Transforms column headers into clean object keys.

✓ Complete Privacy

No sensitive spreadsheet data leaves your device.

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

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