Convert CSV to JSON or JSON to CSV instantly with this free online converter. Easily transform spreadsheet data into JSON objects or parse JSON into CSV format. Perfect for developers, data analysts, and API integrations. No installation or registration required—fast, accurate conversion supporting nested structures and custom delimiters.
How to Use the CSV ↔ JSON Converter
What it does:
- Bidirectional conversion between comma-separated values (CSV) and JSON arrays of objects.
- CSV → JSON: Parses a header row and transforms each subsequent row into an object, using the header fields as keys.
- JSON → CSV: Takes an array of objects and emits a CSV table, automatically collecting all object keys as column headers and escaping commas or quotes as needed.
Modes:
- CSV to JSON Input must be RFC4180-style CSV: first line = headers, fields separated by commas, strings in double-quotes (double quotes inside fields escaped as “”). Output is a pretty-printed JSON array of objects.
- JSON to CSV Input must be valid JSON representing an array of objects. All object keys across the array become columns. Missing values become empty cells. Fields containing commas, quotes or line breaks are quoted and internal quotes doubled.
How to use:
- Select either “CSV to JSON” or “JSON to CSV.”
- Paste your CSV or JSON into the Input box.
- Click Convert to see the result in the Output box.
- Use Copy to copy the converted data, or Clear to reset the input and output.
Tips:
- Empty lines in CSV are ignored. Leading/trailing whitespace outside of quoted fields is trimmed.
- When converting JSON to CSV, nested objects and arrays will be stringified.
- Errors (malformed CSV or invalid JSON) are reported inline in the output area.
- Great for quick data interchange, debugging exports, or preparing API payloads without leaving your browser.
