How to Convert CSV to JSON
Paste your CSV data or upload a file, and the converter instantly generates JSON output. If your CSV has a header row (enabled by default), each row becomes a JSON object with the header values as keys. Without headers, rows become arrays of values.
This is useful when importing spreadsheet data into JavaScript applications, preparing API payloads, or migrating legacy data exports into modern JSON-based systems.
How to Convert JSON to CSV
Click the mode toggle to switch to JSON → CSV. Paste a JSON array of objects, and the converter extracts all keys as CSV columns. Arrays of arrays and single objects are also supported.
JSON to CSV is commonly needed when exporting database query results to Excel, creating reports from API responses, or sharing structured data with non-technical stakeholders.
Supported Delimiters
- Comma — Standard CSV format used in most English-speaking locales.
- Tab — TSV (Tab-Separated Values), common in spreadsheet exports and scientific data.
- Semicolon — Used in European locales where comma is the decimal separator.
- Pipe — Sometimes used in data pipelines, log files, and ETL workflows.
Frequently Asked Questions
Does it handle quoted fields?
Yes. The parser correctly handles double-quoted fields, including fields containing commas, newlines, and escaped quotes ("").
What about nested JSON?
When converting JSON to CSV, nested objects and arrays are converted to their string representation. For deeply nested data, consider flattening the structure first or using a dedicated JSON flattening tool.
Is there a size limit?
There's no hard limit. The tool processes everything in your browser's memory, so files up to a few megabytes work fine. Very large datasets may cause brief lag depending on your device.
Is my data uploaded to a server?
No. All parsing and conversion happens locally in your browser. Your data never leaves your device.