Data Tools
JSON to CSV Converter
Paste a JSON array of objects and instantly get a spreadsheet-ready .csv file with a live preview. Flatten nested fields, pick your delimiter, and download — all in your browser, nothing uploaded.
Preview (first 5 rows)
CSV output
What makes this tool different
Nested JSON flattening
Flatten nested objects into dotted keys (e.g. meta.role) with one toggle, so deep structures become flat spreadsheet columns.
Live preview table
See the first 5 rows as a real table before you download, so you know exactly what the .csv will look like.
Delimiter control
Output comma, semicolon, or tab-separated values — useful for locales where Excel expects a different separator.
100% client-side
Conversion happens locally in your browser. No uploads, no signup — open your Network tab and see zero requests.
About this tool
JSON to CSV Converter: everything you need to know
Moving data from JSON into a spreadsheet is one of the most common developer chores — exporting API responses, preparing datasets for analysis, or handing data to non-technical teammates. OpenToolLab's JSON to CSV converter turns an array of objects into a clean .csv in one click.
The converter builds column headers from your object keys, treats each object as a row, and flattens nested fields into dotted keys when you toggle that option. Nested arrays are serialized into their cell, so even deep structures stay usable in Excel, Google Sheets, or any analytics tool.
Everything runs in your browser. Paste a sensitive API response and convert with confidence — no upload, no account, and no chance of your data sitting on someone's server. The live preview shows the first 5 rows so you can check the shape before downloading.
You can also switch the delimiter between comma, semicolon, and tab for locales where Excel expects a different separator, and download the result as a .csv file ready to import.
Whether you need JSON to CSV for analysis, Excel, or just to read data comfortably, this tool does the job privately and instantly — and pairs naturally with OpenToolLab's JSON to Excel converter for full .xlsx output.
FAQ
JSON to CSV Converter — frequently asked questions
How do I convert JSON to CSV online?
Paste an array of objects into the input box and click Convert to CSV. The tool builds headers from the object keys, flattens nested fields if you ask, shows a preview table, and gives you the output plus a .csv download.
Does the converter handle nested JSON?
Yes. Toggle 'Flatten nested objects' and nested objects become dotted keys like meta.role, while nested arrays are serialized into the cell. This keeps deep structures usable in a flat spreadsheet.
How do I convert JSON to CSV in Python?
Use the built-in csv module plus json: parse with json.loads(), then csv.DictWriter with fieldnames built from the keys. For example: import json, csv; rows = json.loads(text); writer = csv.DictWriter(f, fieldnames=rows[0].keys()). If you'd rather avoid code, this online tool does it in one click.
How do I convert JSON to CSV in Excel?
Excel can open a JSON file directly (Data > Get Data > From File > From JSON), but for quick one-off conversions it's often easier to use an online tool like this one, then open the downloaded .csv in Excel.
How do I turn a JSON file into CSV?
Open the file, copy its contents, and paste them into the converter. Click Convert to CSV, then Download .csv — no installation and no upload required.
Is the JSON to CSV converter free?
Yes, completely free with no signup and no limits. It runs entirely in your browser, so there are no servers or subscriptions involved.
What if my JSON is an array of objects?
That's the ideal input — the tool treats each object as a row and builds columns from the union of all keys. A single object also works and produces a one-row CSV.
Is the conversion private?
Yes. Everything runs locally in your browser — no data is uploaded, stored, or tracked. Open your Network tab while converting and you'll see zero requests leave your device.
Can I convert CSV back to JSON?
Not on this page, but it's a common companion task. For now this tool focuses on JSON to CSV; the related JSON tools on OpenToolLab cover the reverse data-shaping needs.
Keep exploring