JSON / CSV
Convert between JSON and CSV. Auto-detects input format.
About this tool
The JSON / CSV converter transforms data between the two most common formats in software development and data analysis. Paste JSON or CSV into the input and the tool automatically detects the format, converting to the other side with a single click.
To convert JSON to CSV, paste an array of objects into the input area and click "JSON → CSV". The tool extracts the keys from the first object as the header row and generates the corresponding data rows. To convert CSV to JSON, paste a CSV with a header row (first line with column names) and click "CSV → JSON" to get an array of objects with properly mapped keys.
In practice, this tool is widely used to prepare API data (which returns JSON) for import into Excel or Google Sheets spreadsheets, to convert database exports (CSV) into JSON format for processing in scripts, to adapt data for BI tools, and to quickly check how a data structure would look in another format before writing conversion code. Data and backend teams use it frequently to verify compatibility between systems.
All processing is done in your browser. No data is sent to servers, guaranteeing complete privacy for sensitive data. No account is required.
Frequently asked questions
Does the JSON need a specific structure?
Yes, for JSON → CSV conversion you need an array of objects with a uniform structure, for example '[{"name": "Ana", "age": 30}]'. Nested objects or arrays within arrays are not directly supported.
Does the CSV need a header row?
Yes. The first line of the CSV is interpreted as the header and becomes the keys of the resulting JSON objects. CSVs without headers will return an error.
Is this tool free?
Yes, completely free and no signup required.
Is my data sent to any server?
No. Conversion happens entirely in your browser with pure JavaScript. Sensitive data such as customer spreadsheets or internal records never leave your device.
Does it work on mobile?
Yes. The interface is responsive, but pasting large volumes of data is more practical with a physical keyboard.