What does JSON to CSV expect?

A JSON array of flat objects, e.g. [{"name":"Alice","age":30}]. Column headers are built from every key seen across all objects.

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CSV ↔ JSON Converter

Q: What CSV format does this expect?

Standard comma-separated values with an optional header row, using double quotes for fields containing commas, quotes, or line breaks (RFC 4180).

Q: Is my data uploaded anywhere?

No, everything happens directly in the browser using plain JavaScript.

Paste or upload a CSV or JSON file, pick a direction, and convert instantly — entirely in your browser.

Direction

Paste CSV here

Upload File

JSON output

No signup · No file limits · Files never leave your device

How It Works

Pick a Direction

Choose CSV → JSON or JSON → CSV.

Paste or Upload

Paste your data directly, or upload a .csv or .json file.

Convert & Download

Click Convert to see the result instantly, then download it as a file.

Frequently Asked Questions

What CSV format does this expect?

Standard comma-separated values with an optional header row. Fields containing commas, quotes, or line breaks should be wrapped in double quotes (the standard RFC 4180 convention) — this converter both reads and writes that format correctly.

What does JSON → CSV expect?

A JSON array of flat objects, e.g. [{"name":"Alice","age":30}]. The column headers are built from every key seen across all objects, so it still works even if some objects are missing a field.

Is my data uploaded anywhere?

No. Everything happens directly in your browser using plain JavaScript — nothing you paste or upload ever leaves your device.

Is this free?

Yes, completely free with no daily limit.