CSV to JSON Converter — Free Online, Instant, No Upload Required
Convert CSV files to structured JSON arrays and JSON arrays back to CSV — entirely in your browser. Paste raw data or upload a .csv file, switch directions, and copy or download the result instantly.
Frequently Asked Questions
How does the CSV to JSON converter work?
Paste CSV text into the input area or upload a .csv file. The tool reads the first row as headers and maps subsequent rows into JSON objects, returning a clean JSON array. Delimiter detection handles both comma-separated and semicolon-separated CSV files automatically.
Can I convert JSON back to CSV?
Yes. Switch to "JSON → CSV" mode, paste or type a JSON array of objects, and the tool flattens the keys into CSV headers and generates a properly escaped CSV file you can download immediately.
What happens if my JSON has nested objects?
Nested objects are serialized to strings within the CSV cell value. For flat key-value JSON arrays the conversion is lossless. If your data has deeply nested structures, flatten them before converting.
Does this tool support semicolon-delimited CSV files?
Yes. The parser auto-detects whether your CSV uses commas or semicolons as the delimiter and parses accordingly. Both formats produce the same JSON output structure.