JSON to CSV Converter - Convert Online
Convert JSON arrays to CSV tables and vice versa. Automatic delimiter and column detection. All processing happens locally in your browser.
About This Tool
This free JSON to CSV converter lets you transform JSON arrays into CSV spreadsheet data and vice versa — all within your browser. No files are uploaded to any server. No sign-up required.
The JSON to CSV mode automatically detects all keys in your object array and uses them as column headers. String values containing commas, quotes, or newlines are properly escaped with double quotes.
The CSV to JSON mode automatically detects the delimiter (comma, tab, or semicolon) and treats the first row as headers. Each subsequent row becomes a JSON object with the corresponding header keys.
Whether you are preparing data for Excel, Google Sheets, or a database import, this converter handles the formatting correctly so you don't have to.
How to Use
- Choose a mode — Click JSON to CSV to convert JSON arrays to CSV, or CSV to JSON to convert CSV data to JSON.
- Paste your data — Paste your JSON array or CSV text into the input box on the left.
- Click Convert Now — The converted result appears instantly in the output box on the right.
- Copy the result — Use the Copy button to copy the output to your clipboard.
Frequently Asked Questions
Is my data secure?
Yes. All processing is done entirely in your browser using JavaScript. Your JSON and CSV data never leaves your computer and is never uploaded to any server.
What JSON structures are supported for JSON to CSV?
The converter expects an array of objects, for example [{ "name": "Alice", "age": 30 }]. If you pass a single object, it will be treated as a one-row array. Nested objects will be flattened into their string representation.
What CSV delimiters are supported?
The converter automatically detects commas (,), tabs, and semicolons (;) as delimiters. Quoted fields are supported for values that contain the delimiter character, double quotes, or line breaks.
Can I convert CSV to JSON with typed values?
All CSV values are treated as strings in the resulting JSON. If you need numbers or booleans, you can post-process the JSON output with a few lines of code.
Is there a file size limit?
There is no hard limit, but very large datasets (hundreds of thousands of rows) may cause your browser to slow down. For production-scale data, consider using a command-line tool or a server-based converter.