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JSON to CSV Converter

Batch convert, history tracking, support nested JSON structures

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Features Overview

Quickly convert JSON data to CSV format with support for nested structure flattening, batch file conversion, and history tracking. All conversions happen in your browser locally for maximum data security.

Tool Description

Free online JSON to CSV conversion tool. Supports batch file conversion, custom delimiters, flattening nested JSON, and conversion history. 100% browser-side processing, no data uploads.

Capabilities Checklist

  • Three input methods: paste text, upload files, or drag and drop.
  • Smart flattening of nested JSON objects and arrays with customizable separators.
  • Batch convert multiple files and download as a ZIP archive.
  • Save the last 10 conversions and restore configurations with one click.
  • Real-time data preview with customizable delimiters and encoding formats.
  • 100% browser-based processing - your data never leaves your device.

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Frequently Asked Questions

What is a JSON to CSV Converter?
A JSON to CSV converter is an online tool that converts JSON formatted data into CSV (Comma-Separated Values) format. CSV is a universal tabular data format that can be opened by spreadsheet software like Excel and Google Sheets. Our tool supports both simple and complex JSON structures, including nested objects and arrays, with all processing done in your browser to ensure data security.
How do I convert JSON to CSV online?
It's very simple: 1) Paste JSON text or upload a JSON file; 2) Optionally adjust advanced settings like delimiters and encoding; 3) The tool automatically converts and displays a preview; 4) Click the download button to save the CSV file. For batch conversion, you can drag and drop multiple JSON files at once, and the tool will process them all and package them into a ZIP file for download.
Is this JSON to CSV tool completely free?
Yes, our JSON to CSV converter is completely free with no file size limits, no conversion limits, and no hidden fees. You can use all features unlimited times, including batch conversion and history tracking.
Can I convert large JSON files?
Yes. Our tool is optimized to handle larger JSON files (recommended limit is 10MB per file). All processing happens in your browser, so performance depends on your device. For very large files, we recommend using modern browsers (Chrome, Firefox, Edge) for the best performance.
Is my data safe when converting JSON to CSV?
Absolutely safe. All JSON to CSV conversions happen locally in your browser - data is never uploaded to our servers. This means your sensitive data always stays on your device. We cannot access or store any of your data. You can safely process files containing sensitive information.
Does it support nested JSON structures?
Fully supported. The tool provides intelligent nested JSON flattening. For nested objects, keys are joined using a dot (.) or custom separator (e.g., user.address.city). For arrays, they are converted to JSON strings preserved in a single field. You can customize the flattening strategy and separators in the advanced options.
Can I customize the CSV delimiter?
Yes. Besides the default comma delimiter, you can choose semicolon or tab as the CSV delimiter. You can also customize the separator for nested JSON keys (default is dot). Different encoding formats are also supported, including UTF-8, UTF-8 BOM, and GBK, to meet compatibility requirements of different software.
How do I download the converted CSV file?
After conversion is complete, click the download button in the top right corner of the output area to save the CSV file to your device. For batch conversions, click the "Download All" button and all CSV files will be automatically packaged into a ZIP archive for download. All major browsers (Chrome, Firefox, Safari, Edge) support direct downloads.