JSON to CSV Converter

How to Convert JSON to CSV

What This Tool Does

The JSON to CSV Converter transforms JSON array data into CSV (Comma-Separated Values) format entirely in your browser. Whether you have an API response, a database export, or any JSON array of objects, this tool quickly flattens it into a spreadsheet-ready CSV file.

Why Use a Browser-Based Converter?

Privacy and speed. Traditional online converters upload your files to a server, process them remotely, and send the result back. This tool runs entirely on your device using Web Workers, meaning your data never leaves your browser. There is no server round-trip, so conversion is instant, and your sensitive data stays private.

Supported JSON Format

The converter expects a JSON array of flat or nested objects. For example:

[
  { "name": "Alice", "age": 30 },
  { "name": "Bob", "age": 25 }
]

Nested objects are automatically flattened using dot notation (e.g., user.name). Arrays within objects are serialized as JSON strings within the CSV cell, preserving the full data structure for downstream processing.

Using the Output

The resulting CSV file can be opened directly in Excel, Google Sheets, or any spreadsheet application. You can also import it into databases using standard CSV import tools. Choose a custom delimiter (comma, semicolon, tab, or pipe) to match your locale or database requirements.

Tips for Best Results

• Ensure your JSON root is an array of objects, not a single object or a primitive.
• If your data contains commas, quotes, or newlines, the converter automatically wraps and escapes those fields per RFC 4180 standards.
• For very large JSON files (over 50MB), consider splitting the input before conversion to keep the browser responsive.