🔄 CSV ↔ JSON Converter
Convert CSV to JSON and back, right in your browser — nothing is uploaded, everything stays on your device
Input (CSV)
Output (JSON)
100% private: conversion runs entirely in your browser — nothing is uploaded. The CSV parser handles quoted fields with commas, escaped quotes ("") and newlines inside quotes. JSON → CSV accepts an array of objects (or a single object) and unions all keys for the header row.
Convert CSV to JSON and JSON back to CSV in both directions. Paste or upload your data, choose the delimiter and whether the first row is a header, and copy or download the result — all processed in your browser.
Frequently asked questions
How do I convert CSV to JSON?
Paste your CSV, keep "first row is header" on so the columns become object keys, and the JSON appears instantly as an array of objects. Quoted fields containing commas or line breaks are handled correctly.
How do I convert JSON to CSV?
Switch to JSON → CSV mode and paste an array of objects. The tool collects all keys for the header row and quotes any values that contain commas, quotes or newlines.
Is my data uploaded?
No. Parsing and conversion happen entirely in your browser, so spreadsheets and exports with sensitive data never leave your device.