JSON to CSV Converter
Flatten a JSON array of objects into a spreadsheet-ready CSV, right in your browser.
No Data Collection
No database, no accounts. We literally can't see your images.
Blazing Fast
Native browser processing — no upload, no waiting.
100% Free
No limits, no watermarks, no hidden fees. Ever.
No Account Required
Sign in? Never. Just open the tool and use it.
Convert JSON to CSV
Making JSON open in a spreadsheet
An API or export gives you JSON, but the person who needs it wants to open it in Excel, Google Sheets, or Numbers. CSV is the bridge: a flat, comma-separated grid that every spreadsheet imports without complaint.
Paste a JSON array of objects and this tool turns each object into a row. The column order is taken from the order keys first appear, so the output is stable and predictable.
Uneven objects and nested values
Records are rarely uniform. When some objects have keys that others lack, the converter builds the header from the union of every key it sees and leaves a blank cell wherever a row has no value for a column, so nothing shifts out of alignment.
CSV is a flat format, so nested objects and arrays cannot map to a single cell cleanly. They are serialized as compact JSON inside the cell, which keeps the data intact and round-trippable rather than silently dropping it.
Correct quoting, automatically
A value that contains a comma, a double quote, or a line break would break a naive CSV. The converter wraps those values in double quotes and escapes any inner quotes by doubling them, following RFC 4180 so the file opens correctly everywhere.
Values that need no escaping are left untouched, keeping the output compact and easy to read.
Processed locally, never uploaded
Everything happens in your browser. Your JSON is not sent to any server, so business data and personal records never leave your machine.
There is no queue and no upload, so the CSV is ready instantly and the tool works offline once loaded.
Frequently asked questions
What JSON shape does it expect?
An array of objects, where each object becomes one row. The columns are the union of all keys across the objects.
What happens to nested objects or arrays?
Because CSV cells are flat, nested values are written as compact JSON inside the cell so the data is preserved rather than lost.
How are commas and quotes inside values handled?
Any value containing a comma, quote, or line break is wrapped in double quotes and its inner quotes are doubled, per RFC 4180, so the file imports cleanly.
Is my data uploaded?
No. The conversion runs entirely in your browser and your JSON never leaves your device.