JSON to CSV Converter Online
Paste or upload a JSON array, and convert it to a CSV spreadsheet — nested objects flatten automatically, entirely in your browser.
Paste your JSON (an array of objects)
CSV result
Never uploaded
Conversion happens entirely in your browser — your JSON never touches our servers.
Auto-flattening
Nested objects become dotted columns (like address.city) automatically — no manual mapping.
Free, no limit
No account, and no limit on how many times you can use it.
What is JSON to CSV Conversion?
JSON to CSV conversion turns a JSON array of objects into a spreadsheet-friendly table: each object becomes one row, and each unique key across all objects becomes a column. It's the format most spreadsheet tools (Excel, Google Sheets, Numbers) and data pipelines actually expect, so this is a common step after exporting data from an API as JSON.
How to Convert JSON to CSV Online
- Paste or upload your JSON. Paste an array of objects directly into the editor, or click "Upload a file" to load a .json file's contents.
- Click "Convert to CSV." CurePDF builds the column set from every object's keys and produces a properly quoted, escaped CSV.
- Check the result. The row/column count is shown above the output so you can spot-check it matches what you expected.
- Copy or download. Copy the CSV to your clipboard, or download it as a .csv file ready to open in Excel or Sheets.
How Nested Data Is Handled
A spreadsheet row can't hold another whole table inside one cell, so nested JSON needs a convention. This tool flattens nested objects into dotted column names — {"address":{"city":"Pune"}} becomes a column named address.city. Nested arrays are kept as JSON text inside a single cell, since an array can hold a different number of items in every row and can't cleanly become a fixed number of columns.
Frequently Asked Questions
How do I convert JSON to CSV?
Paste or upload a JSON array of objects, click Convert, and download the result as a .csv file — CurePDF turns each object into a row and each unique key into a column, automatically.
What JSON shape does this tool expect?
An array of objects works best — each object becomes one row. A single object is automatically wrapped as a one-row table. Objects with different keys are all supported; missing values are left blank.
What happens to nested objects and arrays?
Nested objects are flattened into dotted column names (for example, address.city). Nested arrays are kept as JSON text inside a single cell, since a spreadsheet column can't represent a variable-length list on its own.
Is my JSON data uploaded anywhere?
No. This tool converts your JSON to CSV entirely in your browser — your data is never sent to CurePDF's servers.
Is it safe to open the CSV in Excel?
Yes. Values are properly quoted and escaped, and any cell that could be misread as a formula (starting with =, +, -, or @) is automatically neutralized, a standard protection against CSV formula injection.
Is the JSON to CSV converter free?
Yes, with no account required and no limit on how many times you can use it.
Does it work on mobile?
Yes, it works the same in a mobile browser as on desktop.
Can I copy or download the result?
Yes — use the Copy button to copy the CSV to your clipboard, or Download to save it as a .csv file.