Start with structured data
Paste a JSON array of objects, or select NDJSON for one JSON object per line.
Data & spreadsheets / Made for the task at hand
Nested objects.
A clearer spreadsheet.
Convert a JSON array or NDJSON into CSV. Flatten nested objects, collect columns across records and keep arrays as JSON cells, privately in your browser.
Your json to csv converter workspace
02 / SOURCE
03 / RESULT
Ready when you areCSV table
A little less work starts here.
Add your source, or try the example, then choose “Build my CSV”.
Results are temporary. Download anything you want to keep.
Your original data is never changed.
◇ Local processing↧ Real, downloadable results⌁ No account required
A practical little workflow
From “I need to…” to done.
Choose the shape
Flatten nested fields into dotted column names. The tool collects all keys, even when records differ.
Export the whole table
Check the first 50 rows and download a spreadsheet-safe CSV, with arrays kept as JSON strings.
Before you get started
Useful answers.
Clear boundaries.
Built for a focused job.
Review important results before use.
Will large numeric IDs stay exact?
JavaScript JSON parsing uses floating-point numbers. Put long IDs and precision-sensitive numbers in quoted JSON strings before conversion. This tool does not preserve arbitrary-precision numeric literals.
What happens to missing values?
Missing fields and null become empty CSV cells. Arrays stay as JSON strings. Flattened key collisions cause an error rather than overwriting data.
Can I load a JSON file from a URL?
This version reads pasted text or a local file up to 10 MB and 20,000 objects. It does not fetch URLs or connect to APIs.
What happens to my data?
Working text and local files are processed in this browser tab and are not sent to a server or an AI service. Reloading clears this workspace. Optional analytics and feedback have separate privacy controls; see Privacy below.