JSON to CSV Converter Online

What Is a JSON to CSV Converter?

A JSON to CSV converter transforms JavaScript Object Notation arrays into comma-separated values format. JSON arrays of objects are the standard output format for REST APIs, database queries, and data processing pipelines. CSV is the universal tabular format supported by every spreadsheet application, database import tool, and data analysis platform including Excel, Google Sheets, pandas, and R.

This converter extracts keys from the first object as CSV column headers, then maps each object's values into corresponding columns. Fields containing commas, newlines, or quotes are automatically wrapped in double quotes following the RFC 4180 standard. The entire conversion is performed locally in your browser, so your API response data, user records, and analytics exports are never sent to any external server.

How to Convert JSON to CSV

1. Paste your JSON array into the input panel. The tool accepts arrays of objects where each object represents a row, or arrays of arrays for headerless data.
2. Click Convert to generate CSV output with headers derived from the object keys in the first element of your array.
3. Review the CSV output in the right panel. Fields with special characters are automatically quoted per RFC 4180 standards.
4. Download the result as a .csv file ready to open in Excel, Google Sheets, or import into any database that supports CSV ingestion.

Why Use PinusX for JSON to CSV Conversion?

Data analysts and backend developers regularly need to export API responses or database query results into spreadsheet-compatible formats for reporting and analysis. PinusX converts JSON to CSV with 100% client-side processing — your data never leaves your browser. This matters when working with production data containing personally identifiable information, financial records, or proprietary business metrics. Unlike server-based converters that store uploaded data on their infrastructure, our tool guarantees zero data retention because no server is involved.

Frequently Asked Questions

How does the converter handle nested JSON objects?

Nested objects are serialized as JSON strings within the CSV cell. For deeply nested structures, consider flattening your JSON first using the JSON Formatter tool before converting to CSV. Only top-level keys are used as column headers.

Can I convert JSON to TSV instead of CSV?

Yes, we have a dedicated JSON to TSV converter that uses tab characters as delimiters instead of commas. TSV is useful when your data contains many commas, as it avoids excessive quoting in the output.

What happens if JSON objects have different keys?

The converter uses the keys from the first object as column headers. Objects missing certain keys will have empty values in those columns. Extra keys in subsequent objects that are not in the first object will be omitted from the CSV output.

Is there a file size limit for JSON to CSV conversion?

There is no imposed file size limit since everything runs in your browser. Practical limits depend on your device's available memory. Most modern devices handle JSON files up to 10-20MB without issues.

Does this tool preserve number formatting?

Numbers are written as-is to the CSV output. JSON numbers like 3.14 or 1000 appear exactly as they are in the source data. If you need specific number formatting like currency or percentages, apply formatting after importing into your spreadsheet application.

Your data never leaves your browser. 100% client-side processing.