Convert JSON to CSV Online
Instantly transform JSON arrays into CSV data, or convert CSV to JSON. 100% free and securely processed entirely in your browser.
100% Client-Side Privacy
This JSON to CSV converter strictly operates inside your browser. Your sensitive CSV and JSON data is never uploaded to our servers, ensuring total data privacy and zero risk of interception.
How to Convert JSON to CSV
This tool offers seamless bidirectional conversion between JSON (JavaScript Object Notation) and CSV (Comma Separated Values). It operates entirely locally for maximum speed.
- Step 1: Paste your JSON array of objects into the left text area.
- Step 2: The tool will instantly parse the JSON and generate a valid CSV string on the right side. The object keys are used as the header row.
- Step 3: Click the "Copy" button to save the output to your clipboard.
To convert CSV to JSON: Simply paste a CSV string into the right text area. The engine will instantly format it as a valid JSON array on the left.
Frequently Asked Questions (FAQ)
Is this JSON to CSV converter free?
Yes, it is 100% free with no limits on usage or file size, provided your browser has enough memory to process it locally.
Is my data uploaded to a server?
No. All JSON parsing and CSV formatting happens entirely within your web browser using client-side JavaScript. Your data never leaves your device.
Does it convert CSV back to JSON?
Yes, our engine is bidirectional. Simply paste your CSV on the right side, and it will instantly output the formatted JSON on the left.
Frequently Asked Questions
How do I convert a JSON API response back into a standard CSV?
Paste your JSON array or upload the file. The tool will parse the JSON keys as column headers and flatten the objects into standard CSV rows instantly.
How does the converter handle deeply nested JSON objects?
The tool flattens nested objects by combining the keys (e.g., `user.address.city`) so the data can fit into a flat, two-dimensional spreadsheet format.
Is my proprietary JSON data uploaded to a server?
No. The parsing and conversion execute entirely within your local browser using JavaScript. Your data remains 100% private and secure.
What happens if some JSON objects are missing certain keys?
The tool scans the entire array to build a master list of all possible keys. If an object is missing a key, that specific cell is simply left blank in the CSV.
Can I convert JSON data that contains arrays within the objects?
Yes. By default, internal arrays are typically joined into a single comma-separated string within quotes, so they don't break the CSV columns.
Does the tool preserve special characters and UTF-8 encoding?
Yes, the generated CSV file is strictly UTF-8 encoded, ensuring that emojis, foreign languages, and special symbols render correctly when opened in Excel.
How can I fix Excel messing up the formatting of my exported CSV?
Excel sometimes incorrectly formats numbers or dates. You can bypass this in Excel by using the 'Data > From Text/CSV' import wizard rather than double-clicking the file.
Is there a limit to how large a JSON file I can convert?
The tool handles extremely large JSON arrays smoothly in the browser, though massive files (hundreds of megabytes) may take a few seconds to flatten and export.