Updated June 2026 · runs 100% in your browser
CSV to JSON
Convert CSV into a JSON array. Paste, convert, copy or download — on your device, no upload.
🔒 Processed on your device · 0 bytes uploaded
How it works
Paste CSV (with a header row) and press Convert to get a JSON array.
It all runs in your browser with JavaScript, so your data never leaves your device. It stays free, unlimited and private, and works offline once loaded.
About CSV to JSON
The first row is treated as headers and each following row becomes a JSON object. Numbers are detected automatically.
Frequently asked questions
How do I use CSV to JSON?
Paste CSV (with a header row) and press Convert to get a JSON array.
Does the first row have to be headers?
Yes — the header row names the keys for each JSON object. Numeric values are converted to numbers.
Is my data uploaded?
No. Everything is parsed and converted in your browser with JavaScript — your data is never sent to a server.
What is a CSV file?
CSV (Comma-Separated Values) is a simple text format for tabular data: each line is a row and commas separate columns. Nearly every spreadsheet and database can read and write it.
What is a JSON file?
JSON (JavaScript Object Notation) is a lightweight, human-readable text format for structured data. It's the standard for web APIs and config files because both people and programs read it easily.