JSON ↔ CSV converter
Convert JSON to CSV or CSV to JSON instantly in your browser. Handles headers, quotes, commas and multiline values without uploads.
Paste either format, then choose a direction.
Private · browser only
Your data stays in this browser. Nothing is uploaded.
Conversion directions
Direction 01
JSON to CSV
Turn a JSON object or object array into CSV with a header row.
Direction 02
CSV to JSON
Parse a header-based CSV document into a JSON object array.
About this converter
How to convert JSON to CSV
Paste a JSON object or an array of objects into the input field and the converter writes a CSV document with one header row followed by one row per record. The tool reads the keys of the first object to build the header, so every object should share the same structure for a clean spreadsheet.
Nested objects and arrays are serialized as JSON strings inside the cell, which keeps CSV flat and importable by Excel, Google Sheets and database loaders. To produce a tidy table, flatten deeply nested JSON before converting.
CSV quoting and special characters
RFC 4180 quoting is applied automatically: any field that contains a comma, double quote or line break is wrapped in double quotes, and embedded double quotes are escaped by doubling them. This means multiline values and values with commas survive a round trip back to JSON without corruption.
The parser handles both and line endings and trims no data, so values are preserved exactly as written.
When to use CSV instead of JSON
CSV is ideal when you need a tabular, human-readable format for spreadsheets, data exchange with legacy systems or bulk database imports. JSON is better for nested or hierarchical data. Converting between the two lets you move records between APIs and spreadsheet workflows without losing structure.
Frequently asked questions
Can I convert CSV to JSON on the same page?
Yes. Enter content in either fixed-format editor and use the direction buttons between them without opening another page.
Does the converter support commas and newlines?
Yes. Properly quoted CSV fields can contain commas, double quotes and line breaks.
Is my data uploaded to a server?
No. All conversion happens in your browser memory. Nothing is sent, stored or logged on a server.
What is the maximum CSV file size?
The limit is your device memory. Most browsers handle files of several megabytes instantly; very large files may take a moment but still never leave your computer.
Does it handle nested JSON objects?
Yes. Nested objects and arrays are serialized as JSON text inside the CSV cell so the data is preserved. Flatten the JSON first if you need each key as its own column.
Can I download the result?
Yes. Use the Download button to save the converted output as a file with the matching extension.